All of the information below has been generated from the results of tests performed on the [Fishtest] framework. Current Testing Criteria * `1 Thread` 60 seconds + 0.6 seconds for 60,000 games `(2019-11-21 - current)` * `8 Threads` 60 seconds + 0.6 seconds for 60,000 games `(2023-06-29 - current)` * [UHO_4060_v3.epd][book-uho4060v3] opening book `(2023-09-10 - current)`

Previous Testing Criteria

* `1 Thread` 60 seconds + 0.6 seconds for 40,000 games `(2016-01-02 - 2019-11-21)` * `1 Thread` 60 seconds + 0.5 seconds for 40,000 games `(2013-10-13 - 2016-01-02)` * `1 Thread` 60 seconds + 0.5 seconds for 20,000 games `(2013-03-04 - 2013-10-13)` * `8 Threads` 30 seconds + 0.3 seconds for 40,000 games `(2018-12-13 - 2023-06-29)` * 8moves_GM.pgn opening book `(2013-04-10 - 2013-11-01)` * varied.bin opening book `(2013-03-04 - 2013-04-07)` * [8moves_v3.pgn][book-8mv3] opening book `(2013-11-09 - 2023-06-29)` * [UHO_XXL_+0.90_+1.19.epd][book-uho21epd] opening book `(2022-04-17 - 2023-06-29)` * [UHO_4060_v2.epd][book-uho4060v2] opening book `(2023-06-29 - 2023-09-10)`

--- ## Current Development

[![][graph-current]][graph-current] | `Date` | `Version` | `1 Thread` | `8 Threads` | |:---:|:---:|:---:|:---:| | 2024‑10‑12 | [master][121024-master] vs [Stockfish 17]
_{`Bench: 1283457`
Make low ply history size fixed
[\[differences\]][121024-dif] `40`} | Elo: [8.99][121024-elo1] ±1.3
_{Ptnml: 48, 5604, 17142, 7159, 47
nElo: 19.27 ±2.8
PairsRatio: 1.27
[\[raw statistics\]][121024-raw1]} | Elo: [4.85][121024-elo8] ±1.1
_{Ptnml: 4, 4647, 19867, 5471, 11
nElo: 11.80 ±2.8
PairsRatio: 1.18
[\[raw statistics\]][121024-raw8]} | 2024‑11‑13 | [master][131124-master] vs [Stockfish 17]
_{`Bench: 840721`
Adjust statscore for captures
[\[differences\]][131124-dif] `63`} | Elo: [11.88][131124-elo1] ±1.3
_{Ptnml: 34, 5232, 17427, 7263, 44
nElo: 25.85 ±2.8
PairsRatio: 1.39
[\[raw statistics\]][131124-raw1]} | Elo: [4.81][131124-elo8] ±1.1
_{Ptnml: 3, 4639, 19887, 5466, 5
nElo: 11.72 ±2.8
PairsRatio: 1.18
[\[raw statistics\]][131124-raw8]} | 2024‑12‑08 | [master][081224-master] vs [Stockfish 17]
_{`Bench: 934447`
Small Major/Minor piece key simplification/optimization.
[\[differences\]][081224-dif] `81`} | Elo: [13.02][081224-elo1] ±1.3
_{Ptnml: 36, 5189, 17325, 7392, 58
nElo: 28.18 ±2.8
PairsRatio: 1.43
[\[raw statistics\]][081224-raw1]} | Elo: [7.59][081224-elo8] ±1.1
_{Ptnml: 9, 4389, 19890, 5707, 5
nElo: 18.49 ±2.8
PairsRatio: 1.30
[\[raw statistics\]][081224-raw8]} | 2025‑01‑06 | [master][060125-master] vs [Stockfish 17]
_{`Bench: 999324`
Remove non-functional std::min()
[\[differences\]][060125-dif] `102`} | Elo: [15.05][060125-elo1] ±1.3
_{Ptnml: 33, 5044, 17264, 7611, 48
nElo: 32.62 ±2.8
PairsRatio: 1.51
[\[raw statistics\]][060125-raw1]} | Elo: [4.81][060125-elo8] ±1.1
_{Ptnml: 9, 4603, 19941, 5443, 4
nElo: 11.73 ±2.8
PairsRatio: 1.18
[\[raw statistics\]][060125-raw8]} | 2025‑01‑12 | [master][120125-master] vs [Stockfish 17]
_{`Bench: 1379150`
Increase the depth margin
[\[differences\]][120125-dif] `118`} | Elo: [10.87][120125-elo1] ±1.3
_{Ptnml: 52, 5424, 17161, 7321, 42
nElo: 23.35 ±2.8
PairsRatio: 1.34
[\[raw statistics\]][120125-raw1]} | Elo: [12.23][120125-elo8] ±1.1
_{Ptnml: 8, 4024, 19823, 6138, 7
nElo: 29.85 ±2.8
PairsRatio: 1.52
[\[raw statistics\]][120125-raw8]} | 2025‑01‑25 | [master][250125-master] vs [Stockfish 17]
_{`Bench: 1438043`
Simplify futility margin in lmr for quiets.
[\[differences\]][250125-dif] `150`} | Elo: [16.96][250125-elo1] ±1.3
_{Ptnml: 50, 4861, 17260, 7770, 59
nElo: 36.72 ±2.8
PairsRatio: 1.59
[\[raw statistics\]][250125-raw1]} | Elo: [14.54][250125-elo8] ±1.1
_{Ptnml: 3, 3796, 19893, 6304, 4
nElo: 35.75 ±2.8
PairsRatio: 1.66
[\[raw statistics\]][250125-raw8]} | 2025‑02‑04 | [master][040225-master] vs [Stockfish 17]
_{`Bench: 2887850`
Reduce less for positions without tt move
[\[differences\]][040225-dif] `177`} | Elo: [7.14][040225-elo1] ±1.3
_{Ptnml: 68, 5808, 17016, 7039, 69
nElo: 15.14 ±2.8
PairsRatio: 1.21
[\[raw statistics\]][040225-raw1]} | Elo: [14.61][040225-elo8] ±1.1
_{Ptnml: 5, 3923, 19625, 6440, 7
nElo: 35.41 ±2.8
PairsRatio: 1.64
[\[raw statistics\]][040225-raw8]} | 2025‑02‑05 | [master][050225-master] vs [Stockfish 17]
_{`Bench: 3197798`
Increase PCM bonus when cutOffCnt is low
[\[differences\]][050225-dif] `181`} | Elo: [10.76][050225-elo1] ±1.3
_{Ptnml: 43, 5526, 17030, 7333, 68
nElo: 22.94 ±2.8
PairsRatio: 1.33
[\[raw statistics\]][050225-raw1]} | Elo: [15.31][050225-elo8] ±1.1
_{Ptnml: 4, 3845, 19662, 6482, 7
nElo: 37.23 ±2.8
PairsRatio: 1.69
[\[raw statistics\]][050225-raw8]} | 2025‑02‑24 | [master][240225-master] vs [Stockfish 17]
_{`Bench: 2146010`
Simplify bestvalue update formula
[\[differences\]][240225-dif] `200`} | Elo: [19.43][240225-elo1] ±1.3
_{Ptnml: 21, 4662, 17306, 7966, 45
nElo: 42.50 ±2.8
PairsRatio: 1.71
[\[raw statistics\]][240225-raw1]} | Elo: [12.09][240225-elo8] ±1.2
_{Ptnml: 7, 4157, 19584, 6246, 6
nElo: 29.15 ±2.8
PairsRatio: 1.50
[\[raw statistics\]][240225-raw8]} | 2025‑03‑21 | [master][210325-master] vs [Stockfish 17]
_{`Bench: 2030154`
Change layout of CorrectionHistory
[\[differences\]][210325-dif] `221`} | Elo: [19.80][210325-elo1] ±1.3
_{Ptnml: 30, 4563, 17419, 7938, 50
nElo: 43.44 ±2.8
PairsRatio: 1.74
[\[raw statistics\]][210325-raw1]} | Elo: [18.76][210325-elo8] ±1.1
_{Ptnml: 6, 3604, 19549, 6830, 11
nElo: 45.55 ±2.8
PairsRatio: 1.90
[\[raw statistics\]][210325-raw8]}

--- ## Version Comparison ### Elo Progression | [![][graph-elo1]][graph-elo1] | [![][graph-elo8]][graph-elo8] | |:---------------------------------:|:---------------------------------:| ### Normalized Elo Progression | [![][graph-nelo1]][graph-nelo1] | [![][graph-nelo8]][graph-nelo8] | |:---------------------------------:|:---------------------------------:| ### Game Pair Ratio Progression | [![][graph-gpr1]][graph-gpr1] | [![][graph-gpr8]][graph-gpr8] | |:---------------------------------:|:---------------------------------:| ### 30 Day Average | [![][graph-thirty1]][graph-thirty1] | [![][graph-thirty8]][graph-thirty8] | |:-----------------------------------:|:-----------------------------------:| ### Draw Percentage vs Elo | [![][graph-dve1]][graph-dve1] | [![][graph-dve8]][graph-dve8] | |:-----------------------------:|:-----------------------------:| --- ## Historical Information

Stockfish 3 Development (2013-03-01 - 2013-04-30)

| `Date` | `Version` | `1 Thread` | |:------:|:---------:|:----------:| | 2013‑03‑04 | [master][040313-master] vs [Stockfish 2.3.1]
_{`Bench: 4968764`
Increase see prune depth
[\[differences\]][040313-dif] `226`} | Elo: [15.00][040313-elo1] ±2.8
_{WDL: 2906, 13325, 3769
nElo: 26.02 ±4.8
[\[raw statistics\]][040313-raw1]} | | 2013‑03‑11 | [master][110313A-master] vs [Stockfish 2.3.1]
_{`Bench: 4968764`
Be more aggressive on trying to finish iterations
[\[differences\]][110313A-dif] `227`} | Elo: [15.49][110313A-elo1] ±2.8
_{WDL: 3016, 13077, 3907
nElo: 26.38 ±4.8
[\[raw statistics\]][110313A-raw1]} | | 2013‑03‑11 | [master][110313B-master] vs [Stockfish 2.3.1]
_{`Bench: 4968764`
Check for easy move just once
[\[differences\]][110313B-dif] `228`} | Elo: [13.42][110313B-elo1] ±2.8
_{WDL: 2974, 13280, 3746
nElo: 23.19 ±4.8
[\[raw statistics\]][110313B-raw1]} | | 2013‑03‑16 | [master][160313-master] vs [Stockfish 2.3.1]
_{`Bench: 5442365`
Further increase SEE prune depth
[\[differences\]][160313-dif] `232`} | Elo: [17.77][160313-elo1] ±2.8
_{WDL: 2897, 13184, 3919
nElo: 30.53 ±4.8
[\[raw statistics\]][160313-raw1]} | | 2013‑03‑24 | [master][240313-master] vs [Stockfish 2.3.1]
_{`Bench: 4985829`
Update bestValue when futility pruning (2)
[\[differences\]][240313-dif] `237`} | Elo: [16.71][240313-elo1] ±2.8
_{WDL: 2874, 13291, 3835
nElo: 28.92 ±4.8
[\[raw statistics\]][240313-raw1]} | | 2013‑03‑30 | [master][300313-master] vs [Stockfish 2.3.1]
_{`Bench: 4781239`
Set IID half way between d/2 and d-4
[\[differences\]][300313-dif] `241`} | Elo: [18.76][300313-elo1] ±2.8
_{WDL: 2824, 13273, 3903
nElo: 32.46 ±4.8
[\[raw statistics\]][300313-raw1]} | | 2013‑04‑03 | [master][030413-master] vs [Stockfish 2.3.1]
_{`Bench: 4705335`
Double Impact of Gain tables
[\[differences\]][030413-dif] `242`} | Elo: [15.44][030413-elo1] ±2.8
_{WDL: 3040, 13032, 3928
nElo: 26.21 ±4.8
[\[raw statistics\]][030413-raw1]} | | 2013‑04‑06 | [master][060413-master] vs [Stockfish 2.3.1]
_{`Bench: 4361224`
Increase null verification threshold to 12 plies
[\[differences\]][060413-dif] `249`} | Elo: [17.11][060413-elo1] ±2.8
_{WDL: 2774, 12861, 3727
nElo: 29.62 ±4.9
[\[raw statistics\]][060413-raw1]} | | 2013‑04‑07 | [master][070413-master] vs [Stockfish 2.3.1]
_{`Bench: 5473339`
Rescale UCI parameters to 100
[\[differences\]][070413-dif] `252`} | Elo: [19.02][070413-elo1] ±2.8
_{WDL: 2948, 13010, 4042
nElo: 32.29 ±4.8
[\[raw statistics\]][070413-raw1]} | | 2013‑04‑10 | [master][100413-master] vs [Stockfish 2.3.1]
_{`Bench: 5157061`
De-templetize Position::is_draw()
[\[differences\]][100413-dif] `257`} | Elo: [24.13][100413-elo1] ±2.8
_{WDL: 2791, 13031, 4178
nElo: 41.10 ±4.8
[\[raw statistics\]][100413-raw1]} | | 2013‑04‑19 | [master][190413-master] vs [Stockfish 2.3.1]
_{`Bench: 5274705`
Skip a couple of popcount in previous patch
[\[differences\]][190413-dif] `262`} | Elo: [28.27][190413-elo1] ±2.9
_{WDL: 2754, 12868, 4378
nElo: 47.69 ±4.9
[\[raw statistics\]][190413-raw1]} | | 2013‑04‑26 | [master][260413-master] vs [Stockfish 2.3.1]
_{`Bench: 4311634`
Fix a crash introduced few days ago
[\[differences\]][260413-dif] `270`} | Elo: [33.67][260413-elo1] ±2.9
_{WDL: 2642, 12784, 4574
nElo: 56.61 ±4.9
[\[raw statistics\]][260413-raw1]} | | 2013‑04‑28 | [master][280413-master] vs [Stockfish 2.3.1]
_{`Bench: 4176431`
Temporary revert "Expose EvalInfo struct to search"
[\[differences\]][280413-dif] `273`} | Elo: [30.86][280413-elo1] ±2.9
_{WDL: 2721, 12786, 4493
nElo: 51.82 ±4.9
[\[raw statistics\]][280413-raw1]} | | 2013‑04‑30 | [Stockfish 3] [[[https://stockfishchess.org/images/logo/icon_128x128.png\|width=20px]]][SF3RN] [[[https://github.githubassets.com/images/icons/emoji/unicode/1f4c8.png\|width=20px]]][SF3DP]
_{`Bench: 4176431`
[\[differences\]][300413-dif] `275`} |

Stockfish 4 Development (2013-04-30 - 2013-08-20)

| `Date` | `Version` | `1 Thread` | |:------:|:---------:|:----------:| | 2013‑05‑16 | [master][160513-master] vs [Stockfish 3]
_{`Bench: 4327405`
Use two counter moves instead of one
[\[differences\]][160513-dif] `28`} | Elo: [22.11][160513-elo1] ±3.0
_{WDL: 3212, 12305, 4483
nElo: 35.78 ±4.8
[\[raw statistics\]][160513-raw1]} | | 2013‑05‑23 | [master][230513-master] vs [Stockfish 3]
_{`Bench: 4821467`
Bunch of 3 small patches
[\[differences\]][230513-dif] `33`} | Elo: [26.70][230513-elo1] ±2.1
_{WDL: 6435, 24062, 9503
nElo: 42.53 ±3.4
[\[raw statistics\]][230513-raw1]} | | 2013‑05‑31 | [master][310513-master] vs [Stockfish 3]
_{`Bench: 4931544`
Passed pawn tuning
[\[differences\]][310513-dif] `38`} | Elo: [29.50][310513-elo1] ±2.2
_{WDL: 6588, 23436, 9976
nElo: 46.13 ±3.4
[\[raw statistics\]][310513-raw1]} | | 2013‑06‑23 | [master][230613-master] vs [Stockfish 3]
_{`Bench: 4609948`
Fix some stale comments
[\[differences\]][230613-dif] `72`} | Elo: [35.47][230613-elo1] ±2.2
_{WDL: 6196, 23539, 10265
nElo: 55.80 ±3.4
[\[raw statistics\]][230613-raw1]} | | 2013‑07‑03 | [master][030713-master] vs [Stockfish 3]
_{`Bench: 4507288`
Simplify aspiration window code
[\[differences\]][030713-dif] `88`} | Elo: [37.36][030713-elo1] ±2.2
_{WDL: 6223, 23269, 10508
nElo: 58.35 ±3.4
[\[raw statistics\]][030713-raw1]} | | 2013‑07‑13 | [master][130713-master] vs [Stockfish 3]
_{`Bench: 4558173`
Fully qualify memset and memcpy
[\[differences\]][130713-dif] `100`} | Elo: [39.27][130713-elo1] ±3.1
_{WDL: 3052, 11645, 5303
nElo: 61.44 ±4.9
[\[raw statistics\]][130713-raw1]} | | 2013‑07‑19 | [master][190713-master] vs [Stockfish 3]
_{`Bench: 4769737`
Halve king eval margin
[\[differences\]][190713-dif] `110`} | Elo: [39.83][190713-elo1] ±3.1
_{WDL: 3067, 11583, 5350
nElo: 62.10 ±4.9
[\[raw statistics\]][190713-raw1]} | | 2013‑07‑25 | [master][250713-master] vs [Stockfish 3]
_{`Bench: 4727133`
Rewrite pawn shield and storm code
[\[differences\]][250713-dif] `133`} | Elo: [48.84][250713-elo1] ±3.3
_{WDL: 3203, 10801, 5996
nElo: 73.11 ±4.9
[\[raw statistics\]][250713-raw1]} | | 2013‑08‑03 | [master][030813-master] vs [Stockfish 3]
_{`Bench: 4424151`
Streamline time computation
[\[differences\]][030813-dif] `147`} | Elo: [50.95][030813-elo1] ±3.2
_{WDL: 3056, 10976, 5968
nElo: 77.14 ±4.9
[\[raw statistics\]][030813-raw1]} | | 2013‑08‑18 | [master][180813-master] vs [Stockfish 3]
_{`Bench: 4132374`
Further tweak movecount pruning
[\[differences\]][180813-dif] `162`} | Elo: [56.66][180813-elo1] ±3.3
_{WDL: 2988, 10791, 6221
nElo: 85.22 ±5.0
[\[raw statistics\]][180813-raw1]} | | 2013‑08‑20 | [Stockfish 4] [[[https://stockfishchess.org/images/logo/icon_128x128.png\|width=20px]]][SF4RN] [[[https://github.githubassets.com/images/icons/emoji/unicode/1f4c8.png\|width=20px]]][SF4DP]
_{`Bench: 4132374`
[\[differences\]][200813-dif] `165`} |

Stockfish DD Development (2013-08-20 - 2013-11-29)

| `Date` | `Version` | `1 Thread` | |:------:|:---------:|:----------:| | 2013‑08‑29 | [master][290813-master] vs [Stockfish 4]
_{`Bench: 4620975`
Enable LMR for dangerous moves
[\[differences\]][290813-dif] `12`} | Elo: [16.18][290813-elo1] ±2.9
_{WDL: 3221, 12627, 4152
nElo: 26.72 ±4.8
[\[raw statistics\]][290813-raw1]} | | 2013‑09‑01 | [master][010913-master] vs [Stockfish 4]
_{`Bench: 3453945`
Don't use lpthread for Android
[\[differences\]][010913-dif] `18`} | Elo: [19.30][010913-elo1] ±2.9
_{WDL: 3083, 12724, 4193
nElo: 32.11 ±4.8
[\[raw statistics\]][010913-raw1]} | | 2013‑09‑05 | [master][050913-master] vs [Stockfish 4]
_{`Bench: 4633330`
Do not prune useless checks in QS
[\[differences\]][050913-dif] `23`} | Elo: [23.80][050913-elo1] ±2.9
_{WDL: 2932, 12768, 4300
nElo: 39.78 ±4.8
[\[raw statistics\]][050913-raw1]} | | 2013‑09‑07 | [master][070913-master] vs [Stockfish 4]
_{`Bench: 3864419`
Remove unreachable values in mobility table
[\[differences\]][070913-dif] `27`} | Elo: [27.66][070913-elo1] ±2.9
_{WDL: 2766, 12879, 4355
nElo: 46.68 ±4.9
[\[raw statistics\]][070913-raw1]} | | 2013‑09‑11 | [master][110913-master] vs [Stockfish 4]
_{`Bench: 4554576`
Extend checks more when below alpha
[\[differences\]][110913-dif] `35`} | Elo: [24.87][110913-elo1] ±2.9
_{WDL: 2824, 12923, 4253
nElo: 42.04 ±4.8
[\[raw statistics\]][110913-raw1]} | | 2013‑09‑12 | [master][120913-master] vs [Stockfish 4]
_{`Bench: 4554579`
Revert "Move draw by material check"
[\[differences\]][120913-dif] `37`} | Elo: [24.34][120913-elo1] ±2.9
_{WDL: 2825, 12951, 4224
nElo: 41.22 ±4.8
[\[raw statistics\]][120913-raw1]} | | 2013‑09‑13 | [master][130913-master] vs [Stockfish 4]
_{`Bench: 3846852`
Increase passed bonus for having more pieces
[\[differences\]][130913-dif] `38`} | Elo: [26.21][130913-elo1] ±2.9
_{WDL: 2871, 12752, 4377
nElo: 43.80 ±4.8
[\[raw statistics\]][130913-raw1]} | | 2013‑09‑16 | [master][160913-master] vs [Stockfish 4]
_{`Bench: 3884003`
Fix time parameters for blitz games
[\[differences\]][160913-dif] `47`} | Elo: [31.56][160913-elo1] ±2.1
_{WDL: 5588, 25200, 9212
nElo: 52.33 ±3.4
[\[raw statistics\]][160913-raw1]} | | 2013‑09‑23 | [master][230913-master] vs [Stockfish 4]
_{`Bench: 3529630`
Update disabled warnings for Intel compiler
[\[differences\]][230913-dif] `54`} | Elo: [34.03][230913-elo1] ±2.1
_{WDL: 5449, 25197, 9354
nElo: 56.49 ±3.4
[\[raw statistics\]][230913-raw1]} | | 2013‑09‑28 | [master][280913-master] vs [Stockfish 4]
_{`Bench: 3172206`
Drop 'is' prefix from query functions
[\[differences\]][280913-dif] `62`} | Elo: [33.49][280913-elo1] ±2.9
_{WDL: 2571, 12936, 4493
nElo: 56.93 ±4.9
[\[raw statistics\]][280913-raw1]} | | 2013‑09‑29 | [master][290913-master] vs [Stockfish 4]
_{`Bench: 8336338`
Add more depth/positions to bench
[\[differences\]][290913-dif] `63`} | Elo: [33.90][290913-elo1] ±2.0
_{WDL: 5292, 25525, 9183
nElo: 56.93 ±3.4
[\[raw statistics\]][290913-raw1]} | | 2013‑10‑08 | [master][081013A-master] vs [Stockfish 4]
_{`Bench: 8340585`
Use TT refined value to stand pat
[\[differences\]][081013A-dif] `66`} | Elo: [36.58][081013A-elo1] ±2.9
_{WDL: 2623, 12656, 4721
nElo: 61.07 ±4.9
[\[raw statistics\]][081013A-raw1]} | | 2013‑10‑08 | [master][081013B-master] vs [Stockfish 4]
_{`Bench: 8340585`
Increase slowmover and reduce instability
[\[differences\]][081013B-dif] `67`} | Elo: [38.91][081013B-elo1] ±2.1
_{WDL: 5102, 25335, 9563
nElo: 65.11 ±3.5
[\[raw statistics\]][081013B-raw1]} | | 2013‑10‑09 | [master][091013-master] vs [Stockfish 4]
_{`Bench: 8279065`
Smoother transition for LMR
[\[differences\]][091013-dif] `68`} | Elo: [39.29][091013-elo1] ±2.1
_{WDL: 5071, 25354, 9575
nElo: 65.80 ±3.4
[\[raw statistics\]][091013-raw1]} | | 2013‑10‑14 | [master][141013-master] vs [Stockfish 4]
_{`Bench: 7700683`
Double king safety weights
[\[differences\]][141013-dif] `75`} | Elo: [43.64][141013-elo1] ±2.9
_{WDL: 2432, 12637, 4931
nElo: 73.12 ±4.9
[\[raw statistics\]][141013-raw1]} | | 2013‑10‑18 | [master][181013-master] vs [Stockfish 4]
_{`Bench: 8440524`
Score chain pawn also by rank
[\[differences\]][181013-dif] `78`} | Elo: [49.51][181013-elo1] ±2.1
_{WDL: 4821, 24696, 10483
nElo: 81.68 ±3.5
[\[raw statistics\]][181013-raw1]} | | 2013‑10‑19 | [master][191013-master] vs [Stockfish 4]
_{`Bench: 9160831`
Further increase safe checks bonus
[\[differences\]][191013-dif] `80`} | Elo: [50.11][191013-elo1] ±2.1
_{WDL: 4817, 24636, 10547
nElo: 82.54 ±3.5
[\[raw statistics\]][191013-raw1]} | | 2013‑10‑20 | [master][201013-master] vs [Stockfish 4]
_{`Bench: 9294116`
Further improve chain pawn evaluation
[\[differences\]][201013-dif] `84`} | Elo: [49.72][201013-elo1] ±3.1
_{WDL: 2677, 11803, 5520
nElo: 79.12 ±4.9
[\[raw statistics\]][201013-raw1]} | | 2013‑10‑22 | [master][221013-master] vs [Stockfish 4]
_{`Bench: 8455956`
Tweak again chain pawn bonus
[\[differences\]][221013-dif] `87`} | Elo: [53.85][221013-elo1] ±3.0
_{WDL: 2425, 12075, 5500
nElo: 87.51 ±4.9
[\[raw statistics\]][221013-raw1]} | | 2013‑10‑24 | [master][241013-master] vs [Stockfish 4]
_{`Bench: 8291883`
Retire mirror()
[\[differences\]][241013-dif] `94`} | Elo: [55.18][241013-elo1] ±3.0
_{WDL: 2385, 12080, 5535
nElo: 89.82 ±4.9
[\[raw statistics\]][241013-raw1]} | | 2013‑10‑28 | [master][281013-master] vs [Stockfish 4]
_{`Bench: 8029334`
Tweak bishop pair and knight weight
[\[differences\]][281013-dif] `96`} | Elo: [52.84][281013-elo1] ±2.1
_{WDL: 4866, 24231, 10903
nElo: 86.04 ±3.5
[\[raw statistics\]][281013-raw1]} | | 2013‑11‑01 | [master][011113-master] vs [Stockfish 4]
_{`Bench: 7995098`
Set timer to a fixed interval
[\[differences\]][011113-dif] `98`} | Elo: [59.73][011113-elo1] ±3.0
_{WDL: 2324, 11947, 5729
nElo: 96.77 ±5.0
[\[raw statistics\]][011113-raw1]} | | 2013‑11‑09 | [master][091113-master] vs [Stockfish 4]
_{`Bench: 7243575`
Futility pruning simplification
[\[differences\]][091113-dif] `106`} | Elo: [60.68][091113-elo1] ±3.0
_{WDL: 2198, 12146, 5656
nElo: 99.73 ±5.0
[\[raw statistics\]][091113-raw1]} | | 2013‑11‑10 | [master][101113-master] vs [Stockfish 4]
_{`Bench: 9282549`
Remove opposed flag for doubled pawns
[\[differences\]][101113-dif] `113`} | Elo: [61.23][101113-elo1] ±2.1
_{WDL: 4333, 24357, 11310
nElo: 100.91 ±3.5
[\[raw statistics\]][101113-raw1]} | | 2013‑11‑11 | [master][111113-master] vs [Stockfish 4]
_{`Bench: 8331357`
Simplify generate\
[\[differences\]][111113-dif] `116`} | Elo: [63.85][111113-elo1] ±2.1
_{WDL: 4185, 24361, 11454
nElo: 105.53 ±3.5
[\[raw statistics\]][111113-raw1]} | | 2013‑11‑29 | [master][291113A-master] vs [Stockfish 4]
_{`Bench: 8596156`
Add support for PPC 64bit on Linux
[\[differences\]][291113A-dif] `123`} | Elo: [67.44][291113A-elo1] ±2.1
_{WDL: 4119, 24094, 11787
nElo: 110.87 ±3.5
[\[raw statistics\]][291113A-raw1]} | | 2013‑11‑29 | [Stockfish DD] [[[https://stockfishchess.org/images/logo/icon_128x128.png\|width=20px]]][SFDDRN] [[[https://github.githubassets.com/images/icons/emoji/unicode/1f4c8.png\|width=20px]]][SFDDDP]
_{`Bench: 8596156`
[\[differences\]][291113B-dif] `124`} |

Stockfish 5 Development (2013-11-29 - 2014-05-31)

| `Date` | `Version` | `1 Thread` | |:------:|:---------:|:----------:| | 2013‑12‑09 | [master][091213-master] vs [Stockfish DD]
_{`Bench: 7869223`
Research at intermediate depth if LMR is very high
[\[differences\]][091213-dif] `23`} | Elo: [7.94][091213-elo1] ±1.9
_{WDL: 5662, 27762, 6576
nElo: 14.37 ±3.4
[\[raw statistics\]][091213-raw1]} | | 2013‑12‑19 | [master][191213-master] vs [Stockfish DD]
_{`Bench: 7425809`
Faster and simplified threat eval
[\[differences\]][191213-dif] `29`} | Elo: [11.35][191213-elo1] ±1.9
_{WDL: 5766, 27162, 7072
nElo: 20.06 ±3.4
[\[raw statistics\]][191213-raw1]} | | 2013‑12‑23 | [master][231213-master] vs [Stockfish DD]
_{`Bench: 6835416`
Loosened trigger condition for king safety
[\[differences\]][231213-dif] `31`} | Elo: [18.62][231213-elo1] ±2.0
_{WDL: 5619, 26620, 7761
nElo: 32.31 ±3.4
[\[raw statistics\]][231213-raw1]} | | 2013‑12‑29 | [master][291213-master] vs [Stockfish DD]
_{`Bench: 7762310`
Retire asymmThreshold
[\[differences\]][291213-dif] `36`} | Elo: [19.54][291213-elo1] ±2.0
_{WDL: 5580, 26593, 7827
nElo: 33.87 ±3.4
[\[raw statistics\]][291213-raw1]} | | 2014‑01‑02 | [master][020114-master] vs [Stockfish DD]
_{`Bench: 7602383`
Ensure move_importance() is non-zero
[\[differences\]][020114-dif] `46`} | Elo: [25.36][020114-elo1] ±2.0
_{WDL: 5371, 26343, 8286
nElo: 43.67 ±3.4
[\[raw statistics\]][020114-raw1]} | | 2014‑01‑08 | [master][080114-master] vs [Stockfish DD]
_{`Bench: 8502826`
Position::gives_check - use ci.ksq
[\[differences\]][080114-dif] `55`} | Elo: [29.85][080114-elo1] ±2.0
_{WDL: 5165, 26242, 8593
nElo: 51.32 ±3.4
[\[raw statistics\]][080114-raw1]} | | 2014‑01‑14 | [master][140114-master] vs [Stockfish DD]
_{`Bench: 7205153`
Introduce 'follow up' moves
[\[differences\]][140114-dif] `59`} | Elo: [29.84][140114-elo1] ±2.0
_{WDL: 5222, 26129, 8649
nElo: 51.09 ±3.4
[\[raw statistics\]][140114-raw1]} | | 2014‑01‑19 | [master][190114-master] vs [Stockfish DD]
_{`Bench: 7804908`
Small simplification to Position::see
[\[differences\]][190114-dif] `64`} | Elo: [32.49][190114-elo1] ±2.0
_{WDL: 5088, 26094, 8818
nElo: 55.65 ±3.4
[\[raw statistics\]][190114-raw1]} | | 2014‑01‑29 | [master][290114-master] vs [Stockfish DD]
_{`Bench: 6875743`
Tweak bishop PSQT tables
[\[differences\]][290114-dif] `70`} | Elo: [36.66][290114-elo1] ±2.0
_{WDL: 4905, 25985, 9110
nElo: 62.70 ±3.4
[\[raw statistics\]][290114-raw1]} | | 2014‑02‑09 | [master][090214-master] vs [Stockfish DD]
_{`Bench: 8347121`
Faster handling of king captures in Position::see
[\[differences\]][090214-dif] `79`} | Elo: [38.63][090214-elo1] ±2.0
_{WDL: 4956, 25659, 9385
nElo: 65.38 ±3.4
[\[raw statistics\]][090214-raw1]} | | 2014‑02‑22 | [master][220214-master] vs [Stockfish DD]
_{`Bench: 8430785`
Fix a warning with Intel compiler
[\[differences\]][220214-dif] `99`} | Elo: [38.93][220214-elo1] ±2.0
_{WDL: 4944, 25649, 9407
nElo: 65.87 ±3.4
[\[raw statistics\]][220214-raw1]} | | 2014‑02‑26 | [master][260214-master] vs [Stockfish DD]
_{`Bench: 7990513`
Dynamic draw value
[\[differences\]][260214-dif] `100`} | Elo: [39.25][260214-elo1] ±2.1
_{WDL: 5164, 25172, 9664
nElo: 65.32 ±3.4
[\[raw statistics\]][260214-raw1]} | | 2014‑03‑14 | [master][140314-master] vs [Stockfish DD]
_{`Bench: 7451319`
Depth dependent aspiration window delta
[\[differences\]][140314-dif] `122`} | Elo: [40.85][140314-elo1] ±2.0
_{WDL: 4925, 25469, 9606
nElo: 68.77 ±3.5
[\[raw statistics\]][140314-raw1]} | | 2014‑03‑24 | [master][240314-master] vs [Stockfish DD]
_{`Bench: 7682173`
Simplify TT replace strategy
[\[differences\]][240314-dif] `138`} | Elo: [43.70][240314-elo1] ±2.1
_{WDL: 4887, 25221, 9892
nElo: 73.08 ±3.5
[\[raw statistics\]][240314-raw1]} | | 2014‑04‑08 | [master][080414-master] vs [Stockfish DD]
_{`Bench: 7533692`
Restrict queen mobility to safe squares
[\[differences\]][080414-dif] `159`} | Elo: [47.70][080414-elo1] ±2.1
_{WDL: 4689, 25165, 10146
nElo: 79.86 ±3.5
[\[raw statistics\]][080414-raw1]} | | 2014‑04‑12 | [master][120414-master] vs [Stockfish DD]
_{`Bench: 6921356`
Move args parsing to UCI::loop
[\[differences\]][120414-dif] `174`} | Elo: [49.21][120414-elo1] ±2.1
_{WDL: 4717, 24938, 10345
nElo: 81.84 ±3.5
[\[raw statistics\]][120414-raw1]} | | 2014‑04‑21 | [master][210414-master] vs [Stockfish DD]
_{`Bench: 7384368`
Reset DrawValue[] before new search
[\[differences\]][210414-dif] `184`} | Elo: [54.53][210414-elo1] ±2.1
_{WDL: 4742, 24289, 10969
nElo: 89.09 ±3.5
[\[raw statistics\]][210414-raw1]} | | 2014‑04‑25 | [master][250414-master] vs [Stockfish DD]
_{`Bench: 7905850`
Speed up picking of killers
[\[differences\]][250414-dif] `191`} | Elo: [57.08][250414-elo1] ±2.2
_{WDL: 4858, 23771, 11371
nElo: 91.87 ±3.5
[\[raw statistics\]][250414-raw1]} | | 2014‑05‑04 | [master][040514-master] vs [Stockfish DD]
_{`Bench: 8802105`
Revert dynamic contempt
[\[differences\]][040514-dif] `216`} | Elo: [53.27][040514-elo1] ±2.2
_{WDL: 5183, 23549, 11268
nElo: 84.84 ±3.5
[\[raw statistics\]][040514-raw1]} | | 2014‑05‑13 | [master][130514-master] vs [Stockfish DD]
_{`Bench: 8739659`
Drop to qsearch at low depth in razoring
[\[differences\]][130514-dif] `227`} | Elo: [57.15][130514-elo1] ±1.8
_{WDL: 7289, 35641, 17070
nElo: 91.95 ±2.9
[\[raw statistics\]][130514-raw1]} | | 2014‑05‑17 | [master][170514-master] vs [Stockfish DD]
_{`Bench: 8732553`
Fix an off-by-one bug in extract_pv_from_tt
[\[differences\]][170514-dif] `229`} | Elo: [55.26][170514-elo1] ±2.2
_{WDL: 5108, 23475, 11417
nElo: 87.95 ±3.5
[\[raw statistics\]][170514-raw1]} | | 2014‑05‑24 | [master][240514-master] vs [Stockfish DD]
_{`Bench: 7396783`
Fix a warning with Intel compiler
[\[differences\]][240514-dif] `234`} | Elo: [53.28][240514-elo1] ±2.1
_{WDL: 4858, 24198, 10944
nElo: 86.68 ±3.5
[\[raw statistics\]][240514-raw1]} | | 2014‑05‑31 | [Stockfish 5] [[[https://stockfishchess.org/images/logo/icon_128x128.png\|width=20px]]][SF5RN] [[[https://github.githubassets.com/images/icons/emoji/unicode/1f4c8.png\|width=20px]]][SF5DP]
_{`Bench: 8732553`
[\[differences\]][310514-dif] `236`} |

Stockfish 6 Development (2014-05-31 - 2015-01-27)

| `Date` | `Version` | `1 Thread` | |:------:|:---------:|:----------:| | 2014‑06‑03 | [master][030614-master] vs [Stockfish 5]
_{`Bench: 8205159`
Symmetric King Safety: take 2
[\[differences\]][030614-dif] `8`} | Elo: [5.35][030614-elo1] ±1.8
_{WDL: 5386, 28612, 6002
nElo: 10.03 ±3.4
[\[raw statistics\]][030614-raw1]} | | 2014‑06‑11 | [master][110614-master] vs [Stockfish 5]
_{`Bench: 7875814`
Simplify pawn threats and merge into ThreatenedByPawn[]
[\[differences\]][110614-dif] `22`} | Elo: [8.30][110614-elo1] ±2.0
_{WDL: 4589, 24491, 5413
nElo: 15.43 ±3.7
[\[raw statistics\]][110614-raw1]} | | 2014‑06‑29 | [master][290614-master] vs [Stockfish 5]
_{`Bench: 8759675`
Fix Singular extension condition to handle mate scores
[\[differences\]][290614-dif] `46`} | Elo: [10.78][290614-elo1] ±1.8
_{WDL: 5152, 28455, 6393
nElo: 20.10 ±3.4
[\[raw statistics\]][290614-raw1]} | | 2014‑07‑22 | [master][220714-master] vs [Stockfish 5]
_{`Bench: 7831429`
Outpost tuning
[\[differences\]][220714-dif] `62`} | Elo: [19.63][220714-elo1] ±1.8
_{WDL: 4775, 28192, 7033
nElo: 36.29 ±3.4
[\[raw statistics\]][220714-raw1]} | | 2014‑08‑06 | [master][060814-master] vs [Stockfish 5]
_{`Bench: 7461881`
Remove insufficient material rule
[\[differences\]][060814-dif] `73`} | Elo: [19.68][060814-elo1] ±1.8
_{WDL: 4737, 28263, 7000
nElo: 36.49 ±3.4
[\[raw statistics\]][060814-raw1]} | | 2014‑09‑04 | [master][040914-master] vs [Stockfish 5]
_{`Bench: 7461881`
Small tweak to idle_loop()
[\[differences\]][040914-dif] `82`} | Elo: [15.90][040914-elo1] ±1.8
_{WDL: 4986, 28199, 6815
nElo: 29.35 ±3.4
[\[raw statistics\]][040914-raw1]} | | 2014‑09‑27 | [master][270914-master] vs [Stockfish 5]
_{`Bench: 6545733`
Remove use of half-ply reductions
[\[differences\]][270914-dif] `93`} | Elo: [22.80][270914-elo1] ±1.9
_{WDL: 4664, 28051, 7285
nElo: 41.96 ±3.4
[\[raw statistics\]][270914-raw1]} | | 2014‑10‑15 | [master][151014-master] vs [Stockfish 5]
_{`Bench: 7328585`
Document why initing eval tables
[\[differences\]][151014-dif] `108`} | Elo: [27.58][151014-elo1] ±1.9
_{WDL: 4613, 27605, 7782
nElo: 49.96 ±3.4
[\[raw statistics\]][151014-raw1]} | | 2014‑11‑01 | [master][011114-master] vs [Stockfish 5]
_{`Bench: 6564212`
Merge pull request #89 from official-stockfish/pull_no_pretty
[\[differences\]][011114-dif] `129`} | Elo: [31.00][011114-elo1] ±1.9
_{WDL: 4484, 27472, 8044
nElo: 55.96 ±3.4
[\[raw statistics\]][011114-raw1]} | | 2014‑11‑10 | [master][101114-master] vs [Stockfish 5]
_{`Bench: 6807896`
Profile Build with Hash=16
[\[differences\]][101114-dif] `148`} | Elo: [36.21][101114-elo1] ±1.9
_{WDL: 4357, 27132, 8511
nElo: 64.71 ±3.4
[\[raw statistics\]][101114-raw1]} | | 2014‑11‑25 | [master][251114-master] vs [Stockfish 5]
_{`Bench: 8255966`
Bitbase index() from ADD to OR
[\[differences\]][251114-dif] `168`} | Elo: [39.02][251114-elo1] ±1.9
_{WDL: 4151, 27225, 8624
nElo: 70.14 ±3.4
[\[raw statistics\]][251114-raw1]} | | 2014‑12‑07 | [master][071214-master] vs [Stockfish 5]
_{`Bench: 9324905`
Simpler PRNG and faster magics search
[\[differences\]][071214-dif] `181`} | Elo: [41.42][071214-elo1] ±1.9
_{WDL: 4108, 27038, 8854
nElo: 74.04 ±3.4
[\[raw statistics\]][071214-raw1]} | | 2014‑12‑22 | [master][221214-master] vs [Stockfish 5]
_{`Bench: 9498821`
Prefer names to numbers in storm code
[\[differences\]][221214-dif] `197`} | Elo: [46.26][221214-elo1] ±1.9
_{WDL: 4011, 26683, 9306
nElo: 81.89 ±3.4
[\[raw statistics\]][221214-raw1]} | | 2015‑01‑07 | [master][070115-master] vs [Stockfish 5]
_{`Bench: 7604776`
Assorted formatting and comment tweaks in position.h
[\[differences\]][070115-dif] `213`} | Elo: [52.10][070115-elo1] ±2.0
_{WDL: 3913, 26688, 9948
nElo: 91.46 ±3.4
[\[raw statistics\]][070115-raw1]} | | 2015‑01‑18 | [master][180115-master] vs [Stockfish 5]
_{`Bench: 8080602`
Stockfish 6 Release Candidate 1
[\[differences\]][180115-dif] `228`} | Elo: [51.71][180115-elo1] ±1.9
_{WDL: 3723, 26644, 9633
nElo: 91.89 ±3.5
[\[raw statistics\]][180115-raw1]} | | 2015‑01‑27 | [Stockfish 6] [[[https://stockfishchess.org/images/logo/icon_128x128.png\|width=20px]]][SF6RN] [[[https://github.githubassets.com/images/icons/emoji/unicode/1f4c8.png\|width=20px]]][SF6DP]
_{`Bench: 8918745`
[\[differences\]][270115-dif] `236`} |

Stockfish 7 Development (2015-01-27 - 2016-01-02)

| `Date` | `Version` | `1 Thread` | |:------:|:---------:|:----------:| | 2015‑02‑08 | [master][080215-master] vs [Stockfish 6]
_{`Bench: 7699138`
Pawn Center Bind Bonus
[\[differences\]][080215-dif] `12`} | Elo: [7.50][080215-elo1] ±2.0
_{WDL: 6423, 26291, 7286
nElo: 12.81 ±3.4
[\[raw statistics\]][080215-raw1]} | | 2015‑03‑19 | [master][190315-master] vs [Stockfish 6]
_{`Bench: 8226843`
Retire ConditionVariable
[\[differences\]][190315-dif] `123`} | Elo: [15.92][190315-elo1] ±1.8
_{WDL: 4796, 28576, 6628
nElo: 29.89 ±3.4
[\[raw statistics\]][190315-raw1]} | | 2015‑03‑29 | [master][290315-master] vs [Stockfish 6]
_{`Bench: 7658627`
Remove some difficult to understand C++11 constructs
[\[differences\]][290315-dif] `137`} | Elo: [19.02][290315-elo1] ±1.8
_{WDL: 4590, 28633, 6777
nElo: 35.82 ±3.4
[\[raw statistics\]][290315-raw1]} | | 2015‑04‑10 | [master][100415-master] vs [Stockfish 6]
_{`Bench: 6985247`
Allow Position::init() to be called more than once
[\[differences\]][100415-dif] `151`} | Elo: [22.12][100415-elo1] ±1.8
_{WDL: 4480, 28497, 7023
nElo: 41.48 ±3.4
[\[raw statistics\]][100415-raw1]} | | 2015‑05‑09 | [master][090515-master] vs [Stockfish 6]
_{`Bench: 8787152`
Smart TT save
[\[differences\]][090515-dif] `164`} | Elo: [28.82][090515-elo1] ±1.8
_{WDL: 4197, 28295, 7508
nElo: 53.80 ±3.4
[\[raw statistics\]][090515-raw1]} | | 2015‑06‑07 | [master][070615-master] vs [Stockfish 6]
_{`Bench: 6716940`
Simplify outpost evaluation
[\[differences\]][070615-dif] `176`} | Elo: [27.85][070615-elo1] ±1.9
_{WDL: 4501, 27798, 7701
nElo: 50.86 ±3.4
[\[raw statistics\]][070615-raw1]} | | 2015‑07‑16 | [master][160715-master] vs [Stockfish 6]
_{`Bench: 6943812`
Fix formatting of previous patch
[\[differences\]][160715-dif] `187`} | Elo: [30.74][160715-elo1] ±1.9
_{WDL: 4367, 27736, 7897
nElo: 56.09 ±3.4
[\[raw statistics\]][160715-raw1]} | | 2015‑07‑30 | [master][300715-master] vs [Stockfish 6]
_{`Bench: 8040572`
Simplify IID depth formula
[\[differences\]][300715-dif] `192`} | Elo: [34.04][300715-elo1] ±1.9
_{WDL: 4283, 27527, 8190
nElo: 61.72 ±3.4
[\[raw statistics\]][300715-raw1]} | | 2015‑10‑03 | [master][031015-master] vs [Stockfish 6]
_{`Bench: 8073614`
File based passed pawn bonus
[\[differences\]][031015-dif] `214`} | Elo: [44.23][031015-elo1] ±1.9
_{WDL: 3690, 27555, 8755
nElo: 80.99 ±3.4
[\[raw statistics\]][031015-raw1]} | | 2015‑10‑25 | [master][251015-master] vs [Stockfish 6]
_{`Bench: 8004751`
Use atomics instead of volatile
[\[differences\]][251015-dif] `232`} | Elo: [61.76][251015-elo1] ±1.9
_{WDL: 3197, 26570, 10233
nElo: 110.69 ±3.5
[\[raw statistics\]][251015-raw1]} | | 2015‑12‑27 | [master][271215-master] vs [Stockfish 6]
_{`Bench: 8355485`
Stockfish 7 Beta 1
[\[differences\]][271215-dif] `267`} | Elo: [62.62][271215-elo1] ±1.6
_{WDL: 4472, 40358, 15170
nElo: 113.94 ±2.8
[\[raw statistics\]][271215-raw1]} | | 2016‑01‑02 | [Stockfish 7] [[[https://stockfishchess.org/images/logo/icon_128x128.png\|width=20px]]][SF7RN] [[[https://github.githubassets.com/images/icons/emoji/unicode/1f4c8.png\|width=20px]]][SF7DP]
_{`Bench: 8355485`
[\[differences\]][020116-dif] `273`} |

Stockfish 8 Development (2016-01-02 - 2016-11-01)

| `Date` | `Version` | `1 Thread` | |:------:|:---------:|:----------:| | 2016‑01‑28 | [master][280116-master] vs [Stockfish 7]
_{`Bench: 7751425`
Time management simplification
[\[differences\]][280116-dif] `16`} | Elo: [4.93][280116-elo1] ±1.5
_{WDL: 3814, 31804, 4382
nElo: 10.90 ±3.4
[\[raw statistics\]][280116-raw1]} | | 2016‑03‑10 | [master][100316-master] vs [Stockfish 7]
_{`Bench: 8261839`
Add follow up moves history for move ordering
[\[differences\]][100316-dif] `28`} | Elo: [12.83][100316-elo1] ±1.5
_{WDL: 3354, 31816, 4830
nElo: 28.44 ±3.4
[\[raw statistics\]][100316-raw1]} | | 2016‑04‑08 | [master][080416-master] vs [Stockfish 7]
_{`Bench: 7482426`
Small passed pawn simplification
[\[differences\]][080416-dif] `42`} | Elo: [15.27][080416-elo1] ±1.5
_{WDL: 3251, 31741, 5008
nElo: 33.74 ±3.4
[\[raw statistics\]][080416-raw1]} | | 2016‑05‑20 | [master][200516-master] vs [Stockfish 7]
_{`Bench: 8428997`
More detailed dependence of time allocation
[\[differences\]][200516-dif] `64`} | Elo: [29.44][200516-elo1] ±1.6
_{WDL: 2719, 31217, 6104
nElo: 63.61 ±3.4
[\[raw statistics\]][200516-raw1]} | | 2016‑06‑10 | [master][100616-master] vs [Stockfish 7]
_{`Bench: 8276130`
Stat Formula Tweak
[\[differences\]][100616-dif] `76`} | Elo: [36.29][100616-elo1] ±1.6
_{WDL: 2606, 30625, 6769
nElo: 76.48 ±3.4
[\[raw statistics\]][100616-raw1]} | | 2016‑07‑24 | [master][240716-master] vs [Stockfish 7]
_{`Bench: 8145304`
Allow null pruning at depth 1
[\[differences\]][240716-dif] `94`} | Elo: [49.73][240716-elo1] ±1.7
_{WDL: 2415, 29483, 8102
nElo: 100.27 ±3.4
[\[raw statistics\]][240716-raw1]} | | 2016‑08‑18 | [master][180816-master] vs [Stockfish 7]
_{`Bench: 7662861`
Remove a stale assignment
[\[differences\]][180816-dif] `101`} | Elo: [52.59][180816-elo1] ±1.7
_{WDL: 2413, 29165, 8422
nElo: 104.74 ±3.4
[\[raw statistics\]][180816-raw1]} | | 2016‑09‑07 | [master][070916-master] vs [Stockfish 7]
_{`Bench: 6024713`
Refactor previous patch
[\[differences\]][070916-dif] `124`} | Elo: [66.53][070916-elo1] ±1.8
_{WDL: 1893, 28647, 9460
nElo: 131.97 ±3.3
[\[raw statistics\]][070916-raw1]} | | 2016‑10‑07 | [master][071016-master] vs [Stockfish 7]
_{`Bench: 6421663`
Optimisation of Position::see and Position::see_sign
[\[differences\]][071016-dif] `149`} | Elo: [76.60][071016-elo1] ±1.8
_{WDL: 1571, 28179, 10250
nElo: 151.24 ±3.3
[\[raw statistics\]][071016-raw1]} | | 2016‑11‑01 | [Stockfish 8] [[[https://stockfishchess.org/images/logo/icon_128x128.png\|width=20px]]][SF8RN] [[[https://github.githubassets.com/images/icons/emoji/unicode/1f4c8.png\|width=20px]]][SF8DP]
_{`Bench: 5926706`
[\[differences\]][011116-dif] `168`} |

Stockfish 9 Development (2016-11-01 - 2018-01-31)

| `Date` | `Version` | `1 Thread` | |:------:|:---------:|:----------:| | 2016‑12‑31 | [master][311216-master] vs [Stockfish 8]
_{`Bench: 5468995`
Small eval cleanup and renaming
[\[differences\]][311216-dif] `55`} | Elo: [5.21][311216-elo1] ±1.5
_{WDL: 3656, 32088, 4256
nElo: 11.72 ±3.4
[\[raw statistics\]][311216-raw1]} | | 2017‑01‑29 | [master][290117-master] vs [Stockfish 8]
_{`Bench: 5941174`
Simplify TT penalty stat (#980)
[\[differences\]][290117-dif] `86`} | Elo: [8.82][290117-elo1] ±1.5
_{WDL: 3580, 31825, 4595
nElo: 19.53 ±3.4
[\[raw statistics\]][290117-raw1]} | | 2017‑03‑08 | [master][080317-master] vs [Stockfish 8]
_{`Bench: 5803228`
Helper functions to count material for both sides
[\[differences\]][080317-dif] `106`} | Elo: [10.84][080317-elo1] ±1.6
_{WDL: 3569, 31614, 4817
nElo: 23.73 ±3.4
[\[raw statistics\]][080317-raw1]} | | 2017‑04‑20 | [master][200417-master] vs [Stockfish 8]
_{`Bench: 6581936`
simplify logic for history based pruning
[\[differences\]][200417-dif] `127`} | Elo: [15.17][200417-elo1] ±1.6
_{WDL: 3430, 31395, 5175
nElo: 32.82 ±3.4
[\[raw statistics\]][200417-raw1]} | | 2017‑05‑07 | [master][070517-master] vs [Stockfish 8]
_{`Bench: 6107863`
Linear Protector bonus by distance
[\[differences\]][070517-dif] `144`} | Elo: [20.25][070517-elo1] ±1.6
_{WDL: 3258, 31155, 5587
nElo: 43.35 ±3.4
[\[raw statistics\]][070517-raw1]} | | 2017‑06‑21 | [master][210617-master] vs [Stockfish 8]
_{`Bench: 5725676`
Increase reduction if tt-move is a capture
[\[differences\]][210617-dif] `167`} | Elo: [27.41][210617-elo1] ±1.6
_{WDL: 2918, 31015, 6067
nElo: 58.52 ±3.4
[\[raw statistics\]][210617-raw1]} | | 2017‑08‑26 | [master][260817-master] vs [Stockfish 8]
_{`Bench: 5965302`
Improve multi-threaded mate finding
[\[differences\]][260817-dif] `218`} | Elo: [29.32][260817-elo1] ±1.6
_{WDL: 2886, 30860, 6254
nElo: 62.17 ±3.4
[\[raw statistics\]][260817-raw1]} | | 2017‑10‑02 | [master][021017-master] vs [Stockfish 8]
_{`Bench: 5620312`
Good bishops on the main diagonals
[\[differences\]][021017-dif] `237`} | Elo: [32.61][021017-elo1] ±1.6
_{WDL: 2688, 30881, 6431
nElo: 69.44 ±3.4
[\[raw statistics\]][021017-raw1]} | | 2017‑11‑03 | [master][031117-master] vs [Stockfish 8]
_{`Bench: 5536775`
Introduce capture history table for capture move sorting
[\[differences\]][031117-dif] `247`} | Elo: [35.18][031117-elo1] ±1.6
_{WDL: 2682, 30600, 6718
nElo: 73.93 ±3.4
[\[raw statistics\]][031117-raw1]} | | 2017‑12‑03 | [master][031217-master] vs [Stockfish 8]
_{`Bench: 5051254`
Use constexpr when makes sense
[\[differences\]][031217-dif] `261`} | Elo: [43.31][031217-elo1] ±1.7
_{WDL: 2406, 30227, 7367
nElo: 90.06 ±3.3
[\[raw statistics\]][031217-raw1]} | | 2018‑01‑23 | [master][230118-master] vs [Stockfish 8]
_{`Bench: 5783344`
Contempt 20
[\[differences\]][230118-dif] `286`} | Elo: [57.25][230118-elo1] ±1.9
_{WDL: 2917, 27634, 9449
nElo: 106.75 ±3.4
[\[raw statistics\]][230118-raw1]} | | 2018‑01‑31 | [Stockfish 9] [[[https://stockfishchess.org/images/logo/icon_128x128.png\|width=20px]]][SF9RN] [[[https://github.githubassets.com/images/icons/emoji/unicode/1f4c8.png\|width=20px]]][SF9DP]
_{`Bench: 5023629`
[\[differences\]][310118-dif] `291`} |

Stockfish 10 Development (2018-01-31 - 2018-11-29)

| `Date` | `Version` | `1 Thread` | |:------:|:---------:|:----------:| | 2018‑02‑28 | [master][280218-master] vs [Stockfish 9]
_{`Bench: 5765806`
Reintroduce depth 2 razoring (with additional margin)
[\[differences\]][280218-dif] `41`} | Elo: [5.16][280218-elo1] ±1.7
_{WDL: 5143, 30105, 5752
nElo: 10.02 ±3.4
[\[raw statistics\]][280218-raw1]} | | 2018‑03‑07 | [master][070318-master] vs [Stockfish 9]
_{`Bench: 5544908`
Simplification: use Arctan for the optimism S-curve
[\[differences\]][070318-dif] `53`} | Elo: [6.94][070318-elo1] ±1.7
_{WDL: 4813, 29575, 5612
nElo: 13.60 ±3.4
[\[raw statistics\]][070318-raw1]} | | 2018‑03‑13 | [master][130318-master] vs [Stockfish 9]
_{`Bench: 5741807`
Use intrinsics only for LSB/MSB
[\[differences\]][130318-dif] `64`} | Elo: [13.03][130318-elo1] ±1.7
_{WDL: 4463, 29574, 5963
nElo: 25.59 ±3.4
[\[raw statistics\]][130318-raw1]} | | 2018‑03‑26 | [master][260318-master] vs [Stockfish 9]
_{`Bench: 5934103`
Make kingRing always 8 squares
[\[differences\]][260318-dif] `75`} | Elo: [13.77][260318-elo1] ±1.7
_{WDL: 4339, 29737, 5924
nElo: 27.26 ±3.4
[\[raw statistics\]][260318-raw1]} | | 2018‑04‑03 | [master][030418-master] vs [Stockfish 9]
_{`Bench: 4989125`
Remove the Queen from the mobility area of minor pieces
[\[differences\]][030418-dif] `92`} | Elo: [16.59][030418-elo1] ±1.7
_{WDL: 4283, 29525, 6192
nElo: 32.54 ±3.4
[\[raw statistics\]][030418-raw1]} | | 2018‑04‑07 | [master][070418-master] vs [Stockfish 9]
_{`Bench: 5170165`
Reset negative statScore on fail high
[\[differences\]][070418-dif] `94`} | Elo: [16.63][070418-elo1] ±1.8
_{WDL: 4397, 29293, 6310
nElo: 32.25 ±3.4
[\[raw statistics\]][070418-raw1]} | | 2018‑04‑23 | [master][230418-master] vs [Stockfish 9]
_{`Bench: 5549801`
Alternative formula for dynamic contempt
[\[differences\]][230418-dif] `106`} | Elo: [15.90][230418-elo1] ±1.8
_{WDL: 4462, 29247, 6291
nElo: 30.76 ±3.4
[\[raw statistics\]][230418-raw1]} | | 2018‑04‑29 | [master][290418-master] vs [Stockfish 9]
_{`Bench: 5254862`
Always scale using pawn contribution
[\[differences\]][290418-dif] `112`} | Elo: [14.61][290418-elo1] ±1.7
_{WDL: 4430, 29459, 6111
nElo: 28.54 ±3.4
[\[raw statistics\]][290418-raw1]} | | 2018‑05‑03 | [master][030518-master] vs [Stockfish 9]
_{`Bench: 5186783`
Tweak the connected[] array value for pawns on rank 5
[\[differences\]][030518-dif] `116`} | Elo: [18.52][030518-elo1] ±1.8
_{WDL: 4385, 29100, 6515
nElo: 35.63 ±3.4
[\[raw statistics\]][030518-raw1]} | | 2018‑05‑13 | [master][130518-master] vs [Stockfish 9]
_{`Bench: 5294316`
Update search.cpp
[\[differences\]][130518-dif] `128`} | Elo: [24.92][130518-elo1] ±1.8
_{WDL: 4175, 28786, 7039
nElo: 47.42 ±3.4
[\[raw statistics\]][130518-raw1]} | | 2018‑05‑24 | [master][240518-master] vs [Stockfish 9]
_{`Bench: 5167159`
LMR Capture Tweak
[\[differences\]][240518-dif] `137`} | Elo: [26.72][240518-elo1] ±1.8
_{WDL: 4033, 28864, 7103
nElo: 51.08 ±3.4
[\[raw statistics\]][240518-raw1]} | | 2018‑06‑05 | [master][050618-master] vs [Stockfish 9]
_{`Bench: 4326784`
Call cycle detection before qsearch()
[\[differences\]][050618-dif] `148`} | Elo: [28.16][050618-elo1] ±1.8
_{WDL: 3971, 28823, 7206
nElo: 53.79 ±3.4
[\[raw statistics\]][050618-raw1]} | | 2018‑06‑11 | [master][110618-master] vs [Stockfish 9]
_{`Bench: 4980482`
Optimize an expression in endgame.cpp
[\[differences\]][110618-dif] `154`} | Elo: [29.72][110618-elo1] ±1.9
_{WDL: 4335, 27917, 7748
nElo: 54.60 ±3.4
[\[raw statistics\]][110618-raw1]} | | 2018‑06‑23 | [master][230618-master] vs [Stockfish 9]
_{`Bench: 4557946`
Another set of tuned values after one million games
[\[differences\]][230618-dif] `162`} | Elo: [31.98][230618-elo1] ±1.9
_{WDL: 4354, 27621, 8025
nElo: 58.11 ±3.4
[\[raw statistics\]][230618-raw1]} | | 2018‑07‑19 | [master][190718-master] vs [Stockfish 9]
_{`Bench: 4817583`
Better check evasion move sorting
[\[differences\]][190718-dif] `179`} | Elo: [36.70][190718-elo1] ±1.9
_{WDL: 4312, 27166, 8522
nElo: 65.70 ±3.4
[\[raw statistics\]][190718-raw1]} | | 2018‑07‑27 | [master][270718-master] vs [Stockfish 9]
_{`Bench: 4905530`
Simplify cmh pruning
[\[differences\]][270718-dif] `199`} | Elo: [37.45][270718-elo1] ±1.9
_{WDL: 4183, 27339, 8478
nElo: 67.55 ±3.4
[\[raw statistics\]][270718-raw1]} | | 2018‑07‑28 | [master][280718-master] vs [Stockfish 9]
_{`Bench: 4883742`
Increase the mg->eg gradient for the PawnlessFlank malus
[\[differences\]][280718-dif] `200`} | Elo: [35.84][280718-elo1] ±1.9
_{WDL: 4235, 27418, 8347
nElo: 64.78 ±3.4
[\[raw statistics\]][280718-raw1]} | | 2018‑07‑31 | [master][310718-master] vs [Stockfish 9]
_{`Bench: 5591925`
Small tweaks to recent code changes
[\[differences\]][310718-dif] `203`} | Elo: [37.67][310718-elo1] ±1.9
_{WDL: 4019, 27642, 8339
nElo: 68.82 ±3.4
[\[raw statistics\]][310718-raw1]} | | 2018‑08‑08 | [master][080818-master] vs [Stockfish 9]
_{`Bench: 4669050`
First check threshold in space evaluation
[\[differences\]][080818-dif] `207`} | Elo: [37.78][080818-elo1] ±1.9
_{WDL: 4224, 27220, 8556
nElo: 67.82 ±3.4
[\[raw statistics\]][080818-raw1]} | | 2018‑08‑12 | [master][120818-master] vs [Stockfish 9]
_{`Bench: 4694813`
Combo of several promising parameter tweaks
[\[differences\]][120818-dif] `211`} | Elo: [40.88][120818-elo1] ±1.9
_{WDL: 4069, 27177, 8754
nElo: 73.46 ±3.4
[\[raw statistics\]][120818-raw1]} | | 2018‑08‑14 | [master][140818-master] vs [Stockfish 9]
_{`Bench: 4272361`
Double weight of capture history
[\[differences\]][140818-dif] `214`} | Elo: [41.69][140818-elo1] ±1.9
_{WDL: 3942, 27339, 8719
nElo: 75.47 ±3.4
[\[raw statistics\]][140818-raw1]} | | 2018‑08‑17 | [master][170818-master] vs [Stockfish 9]
_{`Bench: 4592766`
Use an affine formula to mix stats and eval
[\[differences\]][170818-dif] `217`} | Elo: [43.15][170818-elo1] ±1.9
_{WDL: 3922, 27213, 8865
nElo: 77.82 ±3.4
[\[raw statistics\]][170818-raw1]} | | 2018‑08‑28 | [master][280818A-master] vs [Stockfish 9]
_{`Bench: 4172767`
Tweak stat bonus formula
[\[differences\]][280818A-dif] `220`} | Elo: [44.20][280818A-elo1] ±1.9
_{WDL: 3861, 27217, 8922
nElo: 79.79 ±3.4
[\[raw statistics\]][280818A-raw1]} | | 2018‑08‑28 | [master][280818B-master] vs [Stockfish 9]
_{`Bench: 4413173`
Remove PawnsOnBothFlanks
[\[differences\]][280818B-dif] `225`} | Elo: [42.37][280818B-elo1] ±1.9
_{WDL: 3952, 27242, 8806
nElo: 76.44 ±3.4
[\[raw statistics\]][280818B-raw1]} | | 2018‑09‑01 | [master][010918-master] vs [Stockfish 9]
_{`Bench: 4609645`
Re-introduce "keep pawns on both flanks"
[\[differences\]][010918-dif] `227`} | Elo: [46.46][010918-elo1] ±1.9
_{WDL: 3804, 27075, 9121
nElo: 83.56 ±3.4
[\[raw statistics\]][010918-raw1]} | | 2018‑09‑10 | [master][100918-master] vs [Stockfish 9]
_{`Bench: 4248710`
Tweak opposite colored bishops endgame scaling
[\[differences\]][100918-dif] `230`} | Elo: [45.47][100918-elo1] ±1.9
_{WDL: 3911, 26973, 9116
nElo: 81.36 ±3.4
[\[raw statistics\]][100918-raw1]} | | 2018‑09‑27 | [master][270918-master] vs [Stockfish 9]
_{`Bench: 4059356`
Fix two typos in comments
[\[differences\]][270918-dif] `235`} | Elo: [46.93][270918-elo1] ±1.9
_{WDL: 3883, 26864, 9253
nElo: 83.72 ±3.4
[\[raw statistics\]][270918-raw1]} | | 2018‑10‑14 | [master][141018-master] vs [Stockfish 9]
_{`Bench: 4274207`
Simplify check extensions
[\[differences\]][141018-dif] `241`} | Elo: [49.01][141018-elo1] ±1.9
_{WDL: 3783, 26829, 9388
nElo: 87.49 ±3.4
[\[raw statistics\]][141018-raw1]} | | 2018‑10‑25 | [master][251018-master] vs [Stockfish 9]
_{`Bench: 3314347`
On main thread: reduce depth after fail high
[\[differences\]][251018-dif] `245`} | Elo: [52.82][251018-elo1] ±1.9
_{WDL: 3514, 26937, 9549
nElo: 95.10 ±3.4
[\[raw statistics\]][251018-raw1]} | | 2018‑11‑01 | [master][011118-master] vs [Stockfish 9]
_{`Bench: 3556672`
Fix issues from using adjustedDepth too broadly
[\[differences\]][011118-dif] `248`} | Elo: [51.68][011118-elo1] ±1.9
_{WDL: 3581, 26932, 9487
nElo: 92.90 ±3.4
[\[raw statistics\]][011118-raw1]} | | 2018‑11‑08 | [master][081118-master] vs [Stockfish 9]
_{`Bench: 3647775`
Update list of top CPU contributors
[\[differences\]][081118-dif] `254`} | Elo: [50.43][081118-elo1] ±1.9
_{WDL: 3773, 26689, 9538
nElo: 89.65 ±3.5
[\[raw statistics\]][081118-raw1]} | | 2018‑11‑19 | [master][191118-master] vs [Stockfish 9]
_{`Bench: 3717396`
Stockfish 10-beta
[\[differences\]][191118-dif] `267`} | Elo: [53.77][191118-elo1] ±1.9
_{WDL: 3612, 26634, 9754
nElo: 95.73 ±3.5
[\[raw statistics\]][191118-raw1]} | | 2018‑11‑27 | [master][271118-master] vs [Stockfish 9]
_{`Bench: 3939338`
Simplify casting extension
[\[differences\]][271118-dif] `274`} | Elo: [54.21][271118-elo1] ±1.9
_{WDL: 3562, 26685, 9753
nElo: 96.75 ±3.5
[\[raw statistics\]][271118-raw1]} | | 2018‑11‑29 | [Stockfish 10] [[[https://stockfishchess.org/images/logo/icon_128x128.png\|width=20px]]][SF10RN] [[[https://github.githubassets.com/images/icons/emoji/unicode/1f4c8.png\|width=20px]]][SF10DP]
_{`Bench: 3939338`
[\[differences\]][291118-dif] `277`} |

Stockfish 11 Development (2018-11-29 - 2020-01-17)

| `Date` | `Version` | `1 Thread` | `8 Threads` | |:------:|:---------:|:----------:|:-----------:| | 2018‑12‑06 | [master][061218-master] vs [Stockfish 10]
_{`Bench: 3773021`
Revert "pseudo_legal() and MOVE_NONE"
[\[differences\]][061218-dif] `8`} | Elo: [4.32][061218-elo1] ±1.7
_{WDL: 5033, 29437, 5530
nElo: 8.40 ±3.4
[\[raw statistics\]][061218-raw1]} | | 2018‑12‑13 | [master][131218-master] vs [Stockfish 10]
_{`Bench: 3332460`
A combo of parameter tweaks
[\[differences\]][131218-dif] `16`} | Elo: [8.06][131218-elo1] ±1.8
_{WDL: 5020, 29032, 5948
nElo: 15.41 ±3.4
[\[raw statistics\]][131218-raw1]} | Elo: [12.70][131218-elo8] ±1.7
_{WDL: 4068, 30403, 5529
nElo: 25.98 ±3.4
[\[raw statistics\]][131218-raw8]} | | 2018‑12‑16 | [master][161218-master] vs [Stockfish 10]
_{`Bench: 3646542`
Use stronglyProtected
[\[differences\]][161218-dif] `21`} | Elo: [7.85][161218-elo1] ±1.7
_{WDL: 5107, 30004, 6037
nElo: 15.10 ±3.4
[\[raw statistics\]][161218-raw1]} | | 2019‑01‑04 | [master][040119-master] vs [Stockfish 10]
_{`Bench: 3559104`
Check tablebase files
[\[differences\]][040119-dif] `40`} | Elo: [7.20][040119-elo1] ±1.8
_{WDL: 5164, 28843, 5993
nElo: 13.64 ±3.4
[\[raw statistics\]][040119-raw1]} | | 2019‑01‑10 | [master][100119-master] vs [Stockfish 10]
_{`Bench: 3739723`
Remove pvExact
[\[differences\]][100119-dif] `45`} | Elo: [13.14][100119-elo1] ±1.8
_{WDL: 4779, 28930, 6291
nElo: 25.03 ±3.4
[\[raw statistics\]][100119-raw1]} | Elo: [16.17][100119-elo8] ±1.7
_{WDL: 3887, 30366, 5747
nElo: 33.07 ±3.4
[\[raw statistics\]][100119-raw8]} | | 2019‑01‑22 | [master][220119-master] vs [Stockfish 10]
_{`Bench: 3665090`
Simplify TrappedRook
[\[differences\]][220119-dif] `53`} | Elo: [13.98][220119-elo1] ±1.8
_{WDL: 4714, 28963, 6323
nElo: 26.68 ±3.4
[\[raw statistics\]][220119-raw1]} | | 2019‑02‑03 | [master][030219-master] vs [Stockfish 10]
_{`Bench: 3653942`
Less king danger if we have a knight
[\[differences\]][030219-dif] `61`} | Elo: [17.71][030219-elo1] ±1.8
_{WDL: 4624, 28715, 6661
nElo: 33.46 ±3.4
[\[raw statistics\]][030219-raw1]} | Elo: [19.77][030219-elo8] ±1.7
_{WDL: 3728, 30270, 6002
nElo: 40.32 ±3.4
[\[raw statistics\]][030219-raw8]} | | 2019‑03‑12 | [master][120319-master] vs [Stockfish 10]
_{`Bench: 3318033`
Increase thread stack for OS X (#2035)
[\[differences\]][120319-dif] `80`} | Elo: [16.58][120319-elo1] ±1.8
_{WDL: 4635, 28823, 6542
nElo: 31.46 ±3.4
[\[raw statistics\]][120319-raw1]} | | 2019‑03‑31 | [master][310319-master] vs [Stockfish 10]
_{`Bench: 3548313`
Assorted trivial cleanups 3/2019 (#2030)
[\[differences\]][310319-dif] `91`} | Elo: [16.58][310319-elo1] ±1.8
_{WDL: 4742, 28609, 6649
nElo: 31.16 ±3.4
[\[raw statistics\]][310319-raw1]} | Elo: [24.33][310319-elo8] ±1.7
_{WDL: 3633, 29937, 6430
nElo: 48.91 ±3.4
[\[raw statistics\]][310319-raw8]} | | 2019‑04‑24 | [master][240419-master] vs [Stockfish 10]
_{`Bench: 3402947`
Remove useless initializations (#2115)
[\[differences\]][240419-dif] `113`} | Elo: [16.39][240419-elo1] ±1.8
_{WDL: 4634, 28847, 6519
nElo: 31.13 ±3.4
[\[raw statistics\]][240419-raw1]} | | 2019‑05‑05 | [master][050519-master] vs [Stockfish 10]
_{`Bench: 3644175`
LMR for captures not cracking alpha
[\[differences\]][050519-dif] `121`} | Elo: [16.65][050519-elo1] ±1.8
_{WDL: 4788, 28508, 6704
nElo: 31.17 ±3.4
[\[raw statistics\]][050519-raw1]} | | 2019‑05‑15 | [master][150519-master] vs [Stockfish 10]
_{`Bench: 3824325`
Update failedHighCnt rule #2063
[\[differences\]][150519-dif] `136`} | Elo: [19.76][150519-elo1] ±1.8
_{WDL: 4665, 28397, 6938
nElo: 36.86 ±3.4
[\[raw statistics\]][150519-raw1]} | Elo: [28.93][150519-elo8] ±1.7
_{WDL: 3573, 29531, 6896
nElo: 57.18 ±3.4
[\[raw statistics\]][150519-raw8]} | | 2019‑06‑09 | [master][090619-master] vs [Stockfish 10]
_{`Bench: 3424592`
Remove depth condition for ttPv (#2166)
[\[differences\]][090619-dif] `151`} | Elo: [19.87][090619-elo1] ±1.9
_{WDL: 4796, 28123, 7081
nElo: 36.62 ±3.4
[\[raw statistics\]][090619-raw1]} | | 2019‑06‑20 | [master][200619-master] vs [Stockfish 10]
_{`Bench: 3398333`
More bonus for free passed pawn
[\[differences\]][200619-dif] `161`} | Elo: [24.06][200619-elo1] ±1.8
_{WDL: 4547, 28140, 7313
nElo: 44.48 ±3.4
[\[raw statistics\]][200619-raw1]} | Elo: [30.76][200619-elo8] ±1.7
_{WDL: 3462, 29544, 6994
nElo: 60.92 ±3.4
[\[raw statistics\]][200619-raw8]} | | 2019‑06‑27 | [master][270619-master] vs [Stockfish 10]
_{`Bench: 3633546`
Bonus for double attacks
[\[differences\]][270619-dif] `167`} | Elo: [22.75][270619-elo1] ±1.9
_{WDL: 4644, 28096, 7260
nElo: 41.95 ±3.4
[\[raw statistics\]][270619-raw1]} | | 2019‑07‑11 | [master][110719-master] vs [Stockfish 10]
_{`Bench: 3206912`
Assorted trivial cleanups June 2019
[\[differences\]][110719-dif] `176`} | Elo: [24.39][110719-elo1] ±1.9
_{WDL: 4596, 28005, 7399
nElo: 44.83 ±3.4
[\[raw statistics\]][110719-raw1]} | | 2019‑07‑25 | [master][250719-master] vs [Stockfish 10]
_{`Bench: 3935523`
Tweak of SEE pruning condition
[\[differences\]][250719-dif] `192`} | Elo: [25.72][250719-elo1] ±1.9
_{WDL: 4519, 28006, 7475
nElo: 47.32 ±3.4
[\[raw statistics\]][250719-raw1]} | Elo: [37.49][250719-elo8] ±1.7
_{WDL: 3225, 29251, 7524
nElo: 73.63 ±3.4
[\[raw statistics\]][250719-raw8]} | | 2019‑08‑14 | [master][140819-master] vs [Stockfish 10]
_{`Bench: 4139590`
Tweak unsafe checks
[\[differences\]][140819-dif] `198`} | Elo: [32.24][140819-elo1] ±1.9
_{WDL: 4168, 27963, 7869
nElo: 59.45 ±3.4
[\[raw statistics\]][140819-raw1]} | | 2019‑08‑26 | [master][260819-master] vs [Stockfish 10]
_{`Bench: 3568210`
Tweak Late Move Reduction at root
[\[differences\]][260819-dif] `207`} | Elo: [35.63][260819-elo1] ±1.9
_{WDL: 4021, 27870, 8109
nElo: 65.62 ±3.4
[\[raw statistics\]][260819-raw1]} | Elo: [44.52][260819-elo8] ±1.8
_{WDL: 2958, 28986, 8056
nElo: 86.99 ±3.4
[\[raw statistics\]][260819-raw8]} | | 2019‑09‑12 | [master][120919-master] vs [Stockfish 10]
_{`Bench: 3954190`
Scale down complexity
[\[differences\]][120919-dif] `211`} | Elo: [39.10][120919-elo1] ±1.9
_{WDL: 3824, 27869, 8307
nElo: 72.22 ±3.4
[\[raw statistics\]][120919-raw1]} | | 2019‑09‑16 | [master][160919-master] vs [Stockfish 10]
_{`Bench: 4272173`
Raise stack size to 8MB for pthreads
[\[differences\]][160919-dif] `218`} | Elo: [37.63][160919-elo1] ±1.9
_{WDL: 4007, 27670, 8323
nElo: 68.83 ±3.4
[\[raw statistics\]][160919-raw1]} | Elo: [46.57][160919-elo8] ±1.8
_{WDL: 2764, 28492, 7994
nElo: 91.44 ±3.4
[\[raw statistics\]][160919-raw8]} | | 2019‑09‑24 | [master][240919-master] vs [Stockfish 10]
_{`Bench: 3618154`
Increase weight for supported pawns
[\[differences\]][240919-dif] `226`} | Elo: [38.97][240919-elo1] ±1.9
_{WDL: 3857, 27818, 8325
nElo: 71.81 ±3.4
[\[raw statistics\]][240919-raw1]} | | 2019‑10‑05 | [master][051019-master] vs [Stockfish 10]
_{`Bench: 4131643`
Introduce separate counter-move tables
[\[differences\]][051019-dif] `239`} | Elo: [41.96][051019-elo1] ±1.9
_{WDL: 3746, 27701, 8553
nElo: 77.13 ±3.4
[\[raw statistics\]][051019-raw1]} | Elo: [51.76][051019-elo8] ±1.8
_{WDL: 2628, 28829, 8543
nElo: 101.26 ±3.4
[\[raw statistics\]][051019-raw8]} | | 2019‑10‑18 | [master][181019-master] vs [Stockfish 10]
_{`Bench: 4423737`
Current capture for Counter-Move history
[\[differences\]][181019-dif] `247`} | Elo: [44.63][181019-elo1] ±1.9
_{WDL: 3641, 27608, 8751
nElo: 81.93 ±3.4
[\[raw statistics\]][181019-raw1]} | | 2019‑11‑04 | [master][041119-master] vs [Stockfish 10]
_{`Bench: 4707799`
Rook PSQT Tuned
[\[differences\]][041119-dif] `259`} | Elo: [42.20][041119-elo1] ±1.9
_{WDL: 3686, 27793, 8521
nElo: 77.91 ±3.4
[\[raw statistics\]][041119-raw1]} | Elo: [52.90][041119-elo8] ±1.8
_{WDL: 2601, 28754, 8645
nElo: 103.29 ±3.4
[\[raw statistics\]][041119-raw8]} | | 2019‑11‑14 | [master][141119-master] vs [Stockfish 10]
_{`Bench: 4532366`
Prune before extension
[\[differences\]][141119-dif] `266`} | Elo: [43.12][141119-elo1] ±1.9
_{WDL: 3676, 27709, 8615
nElo: 79.39 ±3.4
[\[raw statistics\]][141119-raw1]} | | 2019‑11‑21 | [master][211119-master] vs [Stockfish 10]
_{`Bench: 5067870`
Do lmr for more captures
[\[differences\]][211119-dif] `271`} | Elo: [46.56][211119-elo1] ±1.5
_{WDL: 5306, 41395, 13299
nElo: 85.60 ±2.8
[\[raw statistics\]][211119-raw1]} | Elo: [53.93][211119-elo8] ±1.8
_{WDL: 2502, 28837, 8661
nElo: 105.86 ±3.4
[\[raw statistics\]][211119-raw8]} | | 2019‑12‑02 | [master][021219-master] vs [Stockfish 10]
_{`Bench: 5122362`
UnblockedStorm tuned
[\[differences\]][021219-dif] `278`} | Elo: [44.88][021219-elo1] ±1.5
_{WDL: 5273, 41746, 12981
nElo: 83.21 ±2.8
[\[raw statistics\]][021219-raw1]} | | 2019‑12‑10 | [master][101219-master] vs [Stockfish 10]
_{`Bench: 5371271`
Refine improving-logic
[\[differences\]][101219-dif] `288`} | Elo: [47.27][101219-elo1] ±1.5
_{WDL: 5329, 41229, 13442
nElo: 86.56 ±2.8
[\[raw statistics\]][101219-raw1]} | Elo: [56.62][101219-elo8] ±1.8
_{WDL: 2365, 28809, 8826
nElo: 111.42 ±3.4
[\[raw statistics\]][101219-raw8]} | | 2020‑01‑07 | [master][070120-master] vs [Stockfish 10]
_{`Bench: 4747984`
Tuned nullmove search
[\[differences\]][070120-dif] `294`} | Elo: [51.50][070120-elo1] ±1.5
_{Ptnml: 160, 3173, 15729, 9546, 1387
nElo: 98.05 ±2.8
PairsRatio: 3.28
[\[raw statistics\]][070120-raw1]} | Elo: [58.15][070120-elo8] ±1.7
_{Ptnml: 36, 1527, 11059, 6509, 860
nElo: 118.69 ±3.4
PairsRatio: 4.71
[\[raw statistics\]][070120-raw8]} | | 2020‑01‑17 | [master][170120-master] vs [Stockfish 10]
_{`Bench: 5156767`
Stockfish 11
[\[differences\]][170120-dif] `307`} | Elo: [53.59][170120-elo1] ±1.5
_{Ptnml: 138, 2988, 15833, 9631, 1407
nElo: 102.99 ±2.8
PairsRatio: 3.53
[\[raw statistics\]][170120-raw1]} | Elo: [58.07][170120-elo8] ±1.7
_{Ptnml: 36, 1478, 11159, 6463, 854
nElo: 119.25 ±3.4
PairsRatio: 4.83
[\[raw statistics\]][170120-raw8]} | | 2020‑01‑17 | [Stockfish 11] [[[https://stockfishchess.org/images/logo/icon_128x128.png\|width=20px]]][SF11RN] [[[https://github.githubassets.com/images/icons/emoji/unicode/1f4c8.png\|width=20px]]][SF11DP]
_{`Bench: 5156767`
[\[differences\]][170120-dif] `307`} |

Stockfish 12 Development (2020-01-17 - 2020-09-02)

| `Date` | `Version` | `1 Thread` | `8 Threads` | |:------:|:---------:|:----------:|:-----------:| | 2020‑01‑28 | [master][280120-master] vs [Stockfish 11]
_{`Bench: 5545845`
More bonus for bestMoves
[\[differences\]][280120-dif] `16`} | Elo: [-2.47][280120-elo1] ±1.3
_{Ptnml: 330, 5657, 18424, 5285, 303
nElo: -5.21 ±2.8
PairsRatio: 0.93
[\[raw statistics\]][280120-raw1]} | | 2020‑01‑31 | [master][310120-master] vs [Stockfish 11]
_{`Bench: 5153165`
Revert 5 recent patches
[\[differences\]][310120-dif] `19`} | Elo: [0.85][310120-elo1] ±1.3
_{Ptnml: 306, 5327, 18593, 5457, 314
nElo: 1.80 ±2.8
PairsRatio: 1.02
[\[raw statistics\]][310120-raw1]} | | 2020‑02‑27 | [master][270220-master] vs [Stockfish 11]
_{`Bench: 4923286`
Weak queen protection
[\[differences\]][270220-dif] `32`} | Elo: [1.33][270220-elo1] ±1.3
_{Ptnml: 327, 5308, 18486, 5567, 312
nElo: 2.80 ±2.8
PairsRatio: 1.04
[\[raw statistics\]][270220-raw1]} | Elo: [0.51][270220-elo8] ±1.4
_{Ptnml: 118, 3072, 13560, 3133, 117
nElo: 1.21 ±3.4
PairsRatio: 1.02
[\[raw statistics\]][270220-raw8]} | | 2020‑03‑20 | [master][200320-master] vs [Stockfish 11]
_{`Bench: 5398277`
Adjust singular extension search depth
[\[differences\]][200320-dif] `48`} | Elo: [2.94][200320-elo1] ±1.3
_{Ptnml: 351, 5099, 18580, 5631, 339
nElo: 6.21 ±2.8
PairsRatio: 1.10
[\[raw statistics\]][200320-raw1]} | | 2020‑04‑07 | [master][070420-master] vs [Stockfish 11]
_{`Bench: 4417023`
Introduce capture history pruning
[\[differences\]][070420-dif] `63`} | Elo: [5.74][070420-elo1] ±1.3
_{Ptnml: 274, 5058, 18460, 5818, 390
nElo: 12.11 ±2.8
PairsRatio: 1.16
[\[raw statistics\]][070420-raw1]} | Elo: [6.49][070420-elo8] ±1.5
_{Ptnml: 113, 2854, 13369, 3501, 163
nElo: 15.05 ±3.4
PairsRatio: 1.23
[\[raw statistics\]][070420-raw8]} | | 2020‑04‑16 | [master][160420-master] vs [Stockfish 11]
_{`Bench: 4958027`
Remove one condition in probcut TTmove
[\[differences\]][160420-dif] `76`} | Elo: [11.33][160420-elo1] ±1.3
_{Ptnml: 281, 4681, 18282, 6313, 443
nElo: 23.65 ±2.8
PairsRatio: 1.36
[\[raw statistics\]][160420-raw1]} | | 2020‑05‑02 | [master][020520-master] vs [Stockfish 11]
_{`Bench: 4247490`
Fishtest Tuning Framework
[\[differences\]][020520-dif] `84`} | Elo: [15.21][020520-elo1] ±1.3
_{Ptnml: 236, 4370, 18388, 6545, 461
nElo: 32.08 ±2.8
PairsRatio: 1.52
[\[raw statistics\]][020520-raw1]} | Elo: [16.71][020520-elo8] ±1.5
_{Ptnml: 105, 2457, 13100, 4087, 251
nElo: 37.85 ±3.4
PairsRatio: 1.69
[\[raw statistics\]][020520-raw8]} | | 2020‑05‑21 | [master][210520-master] vs [Stockfish 11]
_{`Bench: 4778956`
Tweak knight mobility
[\[differences\]][210520-dif] `100`} | Elo: [15.97][210520-elo1] ±1.3
_{Ptnml: 230, 4544, 17963, 6766, 497
nElo: 33.08 ±2.8
PairsRatio: 1.52
[\[raw statistics\]][210520-raw1]} | | 2020‑06‑06 | [master][060620-master] vs [Stockfish 11]
_{`Bench: 4582693`
Use lowply-history also on low depths
[\[differences\]][060620-dif] `117`} | Elo: [19.45][060620-elo1] ±1.4
_{Ptnml: 250, 4360, 17761, 7042, 587
nElo: 39.70 ±2.8
PairsRatio: 1.65
[\[raw statistics\]][060620-raw1]} | Elo: [23.70][060620-elo8] ±1.5
_{Ptnml: 88, 2142, 12987, 4524, 259
nElo: 53.99 ±3.4
PairsRatio: 2.14
[\[raw statistics\]][060620-raw8]} | | 2020‑06‑13 | [master][130620-master] vs [Stockfish 11]
_{`Bench: 4246971`
Tuned values for search constants
[\[differences\]][130620-dif] `127`} | Elo: [20.91][130620-elo1] ±1.4
_{Ptnml: 195, 4263, 17878, 7069, 595
nElo: 43.14 ±2.8
PairsRatio: 1.72
[\[raw statistics\]][130620-raw1]} | Elo: [24.86][130620-elo8] ±1.5
_{Ptnml: 81, 2088, 13016, 4523, 292
nElo: 56.58 ±3.4
PairsRatio: 2.22
[\[raw statistics\]][130620-raw8]} | | 2020‑06‑29 | [master][290620-master] vs [Stockfish 11]
_{`Bench: 4523573`
Tweak single queen endgame scaling
[\[differences\]][290620-dif] `148`} | Elo: [25.67][290620-elo1] ±1.3
_{Ptnml: 192, 3878, 17888, 7397, 645
nElo: 53.10 ±2.8
PairsRatio: 1.98
[\[raw statistics\]][290620-raw1]} | | 2020‑07‑17 | [master][170720-master] vs [Stockfish 11]
_{`Bench: 4578298`
Do not overwrite valuable TT data
[\[differences\]][170720-dif] `163`} | Elo: [26.44][170720-elo1] ±1.3
_{Ptnml: 192, 3800, 17928, 7418, 662
nElo: 54.75 ±2.8
PairsRatio: 2.02
[\[raw statistics\]][170720-raw1]} | Elo: [30.71][170720-elo8] ±1.5
_{Ptnml: 63, 1923, 12759, 4935, 320
nElo: 69.50 ±3.4
PairsRatio: 2.65
[\[raw statistics\]][170720-raw8]} | | 2020‑07‑31 | [master][310720-master] vs [Stockfish 11]
_{`Bench: 4746616`
Tweak cutnode reduction
[\[differences\]][310720-dif] `167`} | Elo: [25.49][310720-elo1] ±1.4
_{Ptnml: 203, 3910, 17861, 7342, 684
nElo: 52.38 ±2.8
PairsRatio: 1.95
[\[raw statistics\]][310720-raw1]} | Elo: [32.39][310720-elo8] ±1.5
_{Ptnml: 69, 1829, 12779, 4961, 362
nElo: 73.03 ±3.4
PairsRatio: 2.80
[\[raw statistics\]][310720-raw8]} | | 2020‑08‑06 | [master][060820-master] vs [Stockfish 11]
_{`Bench: 4746616`
Add NNUE evaluation
[\[differences\]][060820-dif] `168`} | Elo: [83.42][060820-elo1] ±1.7
_{Ptnml: 172, 2656, 12724, 11761, 2687
nElo: 144.72 ±3.0
PairsRatio: 5.11
[\[raw statistics\]][060820-raw1]} | Elo: [86.10][060820-elo8] ±1.9
_{Ptnml: 36, 1192, 9342, 7881, 1549
nElo: 163.20 ±3.6
PairsRatio: 7.68
[\[raw statistics\]][060820-raw8]} | | 2020‑08‑07 | [Add NNUE evaluation][060820-master] [[[https://stockfishchess.org/images/logo/icon_128x128.png\|width=20px]]][SFNNUERN]
_{`Bench: 4746616`
[\[differences\]][070820-dif] `168`} | | 2020‑08‑08 | [master][080820-master] vs [Stockfish 11]
_{`Bench: 4084753`
LMR search tweak
[\[differences\]][080820-dif] `185`} | Elo: [106.20][080820-elo1] ±1.7
_{Ptnml: 67, 1716, 11867, 13060, 3290
nElo: 189.91 ±3.2
PairsRatio: 9.17
[\[raw statistics\]][080820-raw1]} | | 2020‑08‑11 | [master][110820-master] vs [Stockfish 11]
_{`Bench: 4290577`
This commit enables a mixed bench
[\[differences\]][110820-dif] `205`} | Elo: [125.60][110820-elo1] ±1.7
_{Ptnml: 48, 1240, 10613, 14070, 4029
nElo: 224.82 ±3.3
PairsRatio: 14.05
[\[raw statistics\]][110820-raw1]} | Elo: [111.78][110820-elo8] ±1.9
_{Ptnml: 11, 591, 8286, 9168, 1944
nElo: 217.93 ±3.8
PairsRatio: 18.46
[\[raw statistics\]][110820-raw8]} | | 2020‑08‑18 | [master][180820-master] vs [Stockfish 11]
_{`Bench: 4026216`
Fix Makefile typo
[\[differences\]][180820-dif] `226`} | Elo: [121.54][180820-elo1] ±1.7
_{Ptnml: 52, 1373, 10930, 13640, 4005
nElo: 215.22 ±3.3
PairsRatio: 12.38
[\[raw statistics\]][180820-raw1]} | Elo: [111.40][180820-elo8] ±1.9
_{Ptnml: 20, 700, 8128, 9161, 1991
nElo: 213.20 ±3.8
PairsRatio: 15.49
[\[raw statistics\]][180820-raw8]} | | 2020‑08‑30 | [master][300820-master] vs [Stockfish 11]
_{`Bench: 3736029`
Update parameters in classical evaluation
[\[differences\]][300820-dif] `255`} | Elo: [130.96][300820-elo1] ±1.7
_{Ptnml: 44, 1161, 10305, 14128, 4362
nElo: 232.58 ±3.4
PairsRatio: 15.34
[\[raw statistics\]][300820-raw1]} | | 2020‑09‑02 | [master][020920-master] vs [Stockfish 11]
_{`Bench: 3624569`
Stockfish 12
[\[differences\]][020920-dif] `262`} | Elo: [133.65][020920-elo1] ±1.7
_{Ptnml: 32, 1088, 10158, 14286, 4436
nElo: 238.67 ±3.4
PairsRatio: 16.72
[\[raw statistics\]][020920-raw1]} | Elo: [117.62][020920-elo8] ±1.9
_{Ptnml: 10, 562, 8016, 9195, 2217
nElo: 224.93 ±3.8
PairsRatio: 19.95
[\[raw statistics\]][020920-raw8]} | | 2020‑09‑02 | [Stockfish 12] [[[https://stockfishchess.org/images/logo/icon_128x128.png\|width=20px]]][SF12RN] [[[https://github.githubassets.com/images/icons/emoji/unicode/1f4c8.png\|width=20px]]][SF12DP]
_{`Bench: 3624569`
[\[differences\]][020920-dif] `262`} |

Stockfish 13 Development (2020-09-02 - 2021-02-18)

| `Date` | `Version` | `1 Thread` | `8 Threads` | |:------:|:---------:|:----------:|:-----------:| | 2020‑09‑08 | [master][080920-master] vs [Stockfish 12]
_{`Bench: 4161067`
Double probability of using classical eval
[\[differences\]][080920-dif] `10`} | Elo: [6.49][080920-elo1] ±1.0
_{Ptnml: 85, 3319, 22112, 4359, 125
nElo: 17.26 ±2.8
PairsRatio: 1.32
[\[raw statistics\]][080920-raw1]} | | 2020‑09‑21 | [master][210920-master] vs [Stockfish 12]
_{`Bench: 3973739`
Add large page support for NNUE weights
[\[differences\]][210920-dif] `21`} | Elo: [13.88][210920-elo1] ±1.0
_{Ptnml: 49, 2767, 22106, 4896, 182
nElo: 37.07 ±2.8
PairsRatio: 1.80
[\[raw statistics\]][210920-raw1]} | Elo: [8.97][210920-elo8] ±1.1
_{Ptnml: 15, 1474, 16020, 2445, 46
nElo: 27.99 ±3.4
PairsRatio: 1.67
[\[raw statistics\]][210920-raw8]} | | 2020‑09‑28 | [master][280920-master] vs [Stockfish 12]
_{`Bench: 3776081`
Include pawns in NNUE scaling
[\[differences\]][280920-dif] `33`} | Elo: [23.15][280920-elo1] ±1.0
_{Ptnml: 38, 1945, 22217, 5587, 213
nElo: 63.29 ±2.7
PairsRatio: 2.92
[\[raw statistics\]][280920-raw1]} | | 2020‑10‑18 | [master][181020-master] vs [Stockfish 12]
_{`Bench: 4066972`
Do more reductions for late quiet moves
[\[differences\]][181020-dif] `41`} | Elo: [24.09][181020-elo1] ±1.0
_{Ptnml: 43, 2023, 21889, 5827, 218
nElo: 64.60 ±2.7
PairsRatio: 2.93
[\[raw statistics\]][181020-raw1]} | Elo: [21.17][181020-elo8] ±1.1
_{Ptnml: 12, 908, 15789, 3216, 75
nElo: 65.43 ±3.2
PairsRatio: 3.58
[\[raw statistics\]][181020-raw8]} | | 2020‑11‑01 | [master][011120-master] vs [Stockfish 12]
_{`Bench: 3517795`
Update default net to nn-cb26f10b1fd9.nnue
[\[differences\]][011120-dif] `48`} | Elo: [28.02][011120-elo1] ±1.1
_{Ptnml: 63, 2079, 21107, 6469, 282
nElo: 71.59 ±2.7
PairsRatio: 3.15
[\[raw statistics\]][011120-raw1]} | | 2020‑11‑15 | [master][151120-master] vs [Stockfish 12]
_{`Bench: 3597730`
Rook Mobility Tweak
[\[differences\]][151120-dif] `60`} | Elo: [29.99][151120-elo1] ±1.0
_{Ptnml: 32, 1667, 21658, 6389, 254
nElo: 80.38 ±2.7
PairsRatio: 3.91
[\[raw statistics\]][151120-raw1]} | Elo: [25.49][151120-elo8] ±1.1
_{Ptnml: 10, 799, 15532, 3570, 89
nElo: 77.27 ±3.2
PairsRatio: 4.52
[\[raw statistics\]][151120-raw8]} | | 2020‑11‑29 | [master][291120-master] vs [Stockfish 12]
_{`Bench: 3561701`
Update default net to nn-62ef826d1a6d.nnue
[\[differences\]][291120-dif] `72`} | Elo: [30.61][291120-elo1] ±1.0
_{Ptnml: 19, 1645, 21655, 6407, 274
nElo: 82.09 ±2.7
PairsRatio: 4.02
[\[raw statistics\]][291120-raw1]} | | 2020‑12‑14 | [master][141220-master] vs [Stockfish 12]
_{`Bench: 4050630`
Increase reduction in case of stable best move
[\[differences\]][141220-dif] `79`} | Elo: [32.09][141220-elo1] ±1.0
_{Ptnml: 33, 1581, 21474, 6651, 261
nElo: 85.57 ±2.7
PairsRatio: 4.28
[\[raw statistics\]][141220-raw1]} | Elo: [27.50][141220-elo8] ±1.1
_{Ptnml: 10, 706, 15480, 3723, 81
nElo: 83.75 ±3.1
PairsRatio: 5.31
[\[raw statistics\]][141220-raw8]} | | 2020‑12‑31 | [master][311220-master] vs [Stockfish 12]
_{`Bench: 4109336`
WeakUnopposed penalty for backwards
[\[differences\]][311220-dif] `89`} | Elo: [33.71][311220-elo1] ±1.0
_{Ptnml: 23, 1475, 21475, 6730, 297
nElo: 90.01 ±2.6
PairsRatio: 4.69
[\[raw statistics\]][311220-raw1]} | | 2021‑01‑13 | [master][130121-master] vs [Stockfish 12]
_{`Bench: 4287509`
Optimize generate_moves
[\[differences\]][130121-dif] `101`} | Elo: [32.40][130121-elo1] ±1.0
_{Ptnml: 31, 1487, 21588, 6660, 234
nElo: 87.55 ±2.7
PairsRatio: 4.54
[\[raw statistics\]][130121-raw1]} | Elo: [28.29][130121-elo8] ±1.1
_{Ptnml: 10, 671, 15468, 3761, 90
nElo: 86.06 ±3.1
PairsRatio: 5.65
[\[raw statistics\]][130121-raw8]} | | 2021‑02‑15 | [master][150221-master] vs [Stockfish 12]
_{`Bench: 3766422`
Small trivial clean-ups, February 2021
[\[differences\]][150221-dif] `121`} | Elo: [36.03][150221-elo1] ±1.1
_{Ptnml: 29, 1395, 21210, 7079, 287
nElo: 95.63 ±2.7
PairsRatio: 5.17
[\[raw statistics\]][150221-raw1]} | Elo: [29.08][150221-elo8] ±1.1
_{Ptnml: 6, 626, 15476, 3806, 86
nElo: 89.08 ±3.1
PairsRatio: 6.16
[\[raw statistics\]][150221-raw8]} | | 2021‑02‑18 | [Stockfish 13] [[[https://stockfishchess.org/images/logo/icon_128x128.png\|width=20px]]][SF13RN] [[[https://github.githubassets.com/images/icons/emoji/unicode/1f4c8.png\|width=20px]]][SF13DP]
_{`Bench: 3766422`
[\[differences\]][180221-dif] `123`} |

Stockfish 14 Development (2021-02-18 - 2021-07-02)

| `Date` | `Version` | `1 Thread` | `8 Threads` | |:------:|:---------:|:----------:|:-----------:| | 2021‑02‑26 | [master][260221-master] vs [Stockfish 13]
_{`Bench: 5037279`
Introduce DistanceFromPV
[\[differences\]][260221-dif] `4`} | Elo: [1.34][260221-elo1] ±0.8
_{Ptnml: 28, 2367, 24980, 2596, 29
nElo: 4.55 ±2.8
PairsRatio: 1.10
[\[raw statistics\]][260221-raw1]} | | 2021‑03‑24 | [master][240321-master] vs [Stockfish 13]
_{`Bench: 4339126`
Small cleanups (march 2021)
[\[differences\]][240321-dif] `18`} | Elo: [0.61][240321-elo1] ±0.8
_{Ptnml: 18, 2457, 24938, 2575, 12
nElo: 2.09 ±2.8
PairsRatio: 1.05
[\[raw statistics\]][240321-raw1]} | | 2021‑04‑15 | [master][150421-master] vs [Stockfish 13]
_{`Bench: 4503918`
Use classical eval for Bishop vs Pawns
[\[differences\]][150421-dif] `29`} | Elo: [1.47][150421-elo1] ±0.8
_{Ptnml: 39, 2384, 24886, 2667, 24
nElo: 4.93 ±2.8
PairsRatio: 1.11
[\[raw statistics\]][150421-raw1]} | Elo: [0.89][150421-elo8] ±0.9
_{Ptnml: 11, 1279, 17318, 1381, 11
nElo: 3.38 ±3.4
PairsRatio: 1.08
[\[raw statistics\]][150421-raw8]} | | 2021‑05‑22 | [master][220521-master] vs [Stockfish 13]
_{`Bench: 3856635`
Sometimes change the balance
[\[differences\]][220521-dif] `62`} | Elo: [10.12][220521-elo1] ±1.0
_{Ptnml: 60, 2454, 23277, 4096, 113
nElo: 29.34 ±2.8
PairsRatio: 1.67
[\[raw statistics\]][220521-raw1]} | | 2021‑06‑14 | [master][140621-master] vs [Stockfish 13]
_{`Bench: 4877339`
Update default net to nn-8e47cf062333.nnue
[\[differences\]][140621-dif] `90`} | Elo: [21.80][140621-elo1] ±1.1
_{Ptnml: 67, 2216, 21852, 5620, 245
nElo: 57.47 ±2.7
PairsRatio: 2.57
[\[raw statistics\]][140621-raw1]} | Elo: [16.96][140621-elo8] ±1.1
_{Ptnml: 15, 1083, 15923, 2894, 85
nElo: 52.38 ±3.3
PairsRatio: 2.71
[\[raw statistics\]][140621-raw8]} | | 2021‑06‑18 | [master][180621-master] vs [Stockfish 13]
_{`Bench: 4900906`
Make net nn-50144f835024.nnue the default
[\[differences\]][180621-dif] `100`} | Elo: [25.56][180621-elo1] ±1.0
_{Ptnml: 30, 1814, 22084, 5864, 208
nElo: 69.95 ±2.7
PairsRatio: 3.29
[\[raw statistics\]][180621-raw1]} | | 2021‑06‑29 | [master][290621-master] vs [Stockfish 13]
_{`Bench: 4770936`
Update Top CPU Contributors
[\[differences\]][290621-dif] `113`} | Elo: [30.27][290621-elo1] ±1.0
_{Ptnml: 14, 1443, 22127, 6146, 270
nElo: 83.66 ±2.6
PairsRatio: 4.40
[\[raw statistics\]][290621-raw1]} | Elo: [22.62][290621-elo8] ±1.1
_{Ptnml: 7, 755, 15977, 3153, 108
nElo: 71.15 ±3.1
PairsRatio: 4.28
[\[raw statistics\]][290621-raw8]} | | 2021‑07‑02 | [Stockfish 14] [[[https://stockfishchess.org/images/logo/icon_128x128.png\|width=20px]]][SF14RN] [[[https://github.githubassets.com/images/icons/emoji/unicode/1f4c8.png\|width=20px]]][SF14DP]
_{`Bench: 4770936`
[\[differences\]][020721-dif] `114`} |

Stockfish 15 Development (2021-07-02 - 2022-04-18)

| `Date` | `Version` | `1 Thread` | `8 Threads` | `1 Thread (UHO)` | |:---:|:---:|:---:|:---:|:---:| | 2021‑07‑26 | [master][260721-master] vs [Stockfish 14]
_{`Bench: 5124774`
Update default net to nn-26abeed38351.nnue
[\[differences\]][260721-dif] `17`} | Elo: [2.74][260721-elo1] ±0.8
_{Ptnml: 24, 2000, 25476, 2478, 22
nElo: 9.85 ±2.8
PairsRatio: 1.24
[\[raw statistics\]][260721-raw1]} | | | 2021‑08‑15 | [master][150821-master] vs [Stockfish 14]
_{`Bench: 5189338`
New NNUE architecture and net
[\[differences\]][150821-dif] `26`} | Elo: [9.31][150821-elo1] ±0.9
_{Ptnml: 24, 2044, 24321, 3522, 89
nElo: 29.61 ±2.7
PairsRatio: 1.75
[\[raw statistics\]][150821-raw1]} | Elo: [6.08][150821-elo8] ±0.9
_{Ptnml: 5, 1063, 17183, 1725, 24
nElo: 22.66 ±3.4
PairsRatio: 1.64
[\[raw statistics\]][150821-raw8]} | | | 2021‑08‑31 | [master][310821-master] vs [Stockfish 14]
_{`Bench: 5600615`
Update default net to nn-735bba95dec0.nnue
[\[differences\]][310821-dif] `39`} | Elo: [15.04][310821-elo1] ±0.9
_{Ptnml: 17, 1601, 24272, 3990, 120
nElo: 47.86 ±2.7
PairsRatio: 2.54
[\[raw statistics\]][310821-raw1]} | | | 2021‑09‑15 | [master][150921-master] vs [Stockfish 14]
_{`Bench: 6658747`
Update default net to nn-13406b1dcbe0.nnue
[\[differences\]][150921-dif] `46`} | Elo: [16.64][150921-elo1] ±0.9
_{Ptnml: 21, 1878, 23452, 4506, 143
nElo: 49.53 ±2.7
PairsRatio: 2.45
[\[raw statistics\]][150921-raw1]} | Elo: [12.39][150921-elo8] ±0.9
_{Ptnml: 1, 766, 17084, 2104, 45
nElo: 45.59 ±3.2
PairsRatio: 2.80
[\[raw statistics\]][150921-raw8]} | | | 2021‑10‑06 | [master][061021-master] vs [Stockfish 14]
_{`Bench: 6261865`
Capping stat bonus at 2000
[\[differences\]][061021-dif] `57`} | Elo: [18.68][061021-elo1] ±0.9
_{Ptnml: 28, 1496, 23821, 4535, 120
nElo: 57.70 ±2.7
PairsRatio: 3.05
[\[raw statistics\]][061021-raw1]} | Elo: [11.74][061021-elo8] ±0.9
_{Ptnml: 4, 769, 17137, 2052, 38
nElo: 43.60 ±3.2
PairsRatio: 2.70
[\[raw statistics\]][061021-raw8]} | | | 2021‑10‑18 | [master][181021-master] vs [Stockfish 14]
_{`Bench: 5005810`
Simplify probCutCount away
[\[differences\]][181021-dif] `67`} | Elo: [17.69][181021-elo1] ±0.9
_{Ptnml: 13, 1577, 23891, 4382, 137
nElo: 54.78 ±2.7
PairsRatio: 2.84
[\[raw statistics\]][181021-raw1]} | | | 2021‑10‑23 | [master][231021-master] vs [Stockfish 14]
_{`Bench: 6334068`
Adjust ButterflyHistory decay parameter
[\[differences\]][231021-dif] `78`} | Elo: [17.87][231021-elo1] ±0.9
_{Ptnml: 11, 1377, 24244, 4253, 115
nElo: 57.35 ±2.6
PairsRatio: 3.15
[\[raw statistics\]][231021-raw1]} | Elo: [10.27][231021-elo8] ±0.9
_{Ptnml: 3, 696, 17438, 1842, 21
nElo: 40.55 ±3.2
PairsRatio: 2.67
[\[raw statistics\]][231021-raw8]} | | | 2021‑10‑28 | [Stockfish 14.1] [[[https://stockfishchess.org/images/logo/icon_128x128.png\|width=20px]]][SF141RN]
_{`Bench: 6334068`
[\[differences\]][281021-dif] `80`} | | | 2021‑11‑05 | [master][051121-master] vs [Stockfish 14]
_{`Bench: 6719976`
Tweak initial aspiration window
[\[differences\]][051121-dif] `89`} | Elo: [18.71][051121-elo1] ±0.9
_{Ptnml: 16, 1293, 24255, 4319, 117
nElo: 60.14 ±2.6
PairsRatio: 3.39
[\[raw statistics\]][051121-raw1]} | | | 2021‑11‑23 | [master][231121-master] vs [Stockfish 14]
_{`Bench: 7334766`
Less futility pruning
[\[differences\]][231121-dif] `98`} | Elo: [19.35][231121-elo1] ±0.9
_{Ptnml: 19, 1405, 23923, 4524, 129
nElo: 60.39 ±2.6
PairsRatio: 3.27
[\[raw statistics\]][231121-raw1]} | Elo: [13.28][231121-elo8] ±0.9
_{Ptnml: 3, 696, 17112, 2148, 41
nElo: 49.26 ±3.2
PairsRatio: 3.13
[\[raw statistics\]][231121-raw8]} | | | 2021‑11‑28 | [master][281121-master] vs [Stockfish 14]
_{`Bench: 6302543`
Refine futility pruning for parent nodes
[\[differences\]][281121-dif] `103`} | Elo: [24.44][281121-elo1] ±0.9
_{Ptnml: 9, 1054, 23776, 5037, 124
nElo: 76.95 ±2.5
PairsRatio: 4.86
[\[raw statistics\]][281121-raw1]} | | | 2021‑12‑07 | [master][071221-master] vs [Stockfish 14]
_{`Bench: 4667742`
Update default net to nn-63376713ba63.nnue
[\[differences\]][071221-dif] `118`} | Elo: [26.99][071221-elo1] ±0.9
_{Ptnml: 11, 998, 23473, 5365, 153
nElo: 83.13 ±2.5
PairsRatio: 5.47
[\[raw statistics\]][071221-raw1]} | Elo: [17.80][071221-elo8] ±0.9
_{Ptnml: 6, 529, 16919, 2504, 42
nElo: 64.76 ±3.1
PairsRatio: 4.76
[\[raw statistics\]][071221-raw8]} | | | 2021‑12‑14 | [master][141221-master] vs [Stockfish 14]
_{`Bench: 4735679`
Remove NNUE scaling term
[\[differences\]][141221-dif] `126`} | Elo: [26.45][141221-elo1] ±0.9
_{Ptnml: 9, 962, 23656, 5207, 166
nElo: 82.28 ±2.5
PairsRatio: 5.53
[\[raw statistics\]][141221-raw1]} | | | 2021‑12‑22 | [master][221221-master] vs [Stockfish 14]
_{`Bench: 4633875`
Update default net to nn-ac07bd334b62.nnue
[\[differences\]][221221-dif] `139`} | Elo: [28.65][221221-elo1] ±0.9
_{Ptnml: 11, 1036, 23172, 5567, 214
nElo: 85.61 ±2.5
PairsRatio: 5.52
[\[raw statistics\]][221221-raw1]} | Elo: [17.66][221221-elo8] ±0.9
_{Ptnml: 2, 520, 16976, 2448, 54
nElo: 64.60 ±3.0
PairsRatio: 4.79
[\[raw statistics\]][221221-raw8]} | | | 2022‑01‑10 | [master][100122-master] vs [Stockfish 14]
_{`Bench: 4572746`
Adjust pruning constants
[\[differences\]][100122-dif] `148`} | Elo: [30.51][100122-elo1] ±1.0
_{Ptnml: 13, 1065, 22809, 5879, 234
nElo: 89.03 ±2.5
PairsRatio: 5.67
[\[raw statistics\]][100122-raw1]} | | | 2022‑01‑29 | [master][290122-master] vs [Stockfish 14]
_{`Bench: 4637392`
Do stats updates after LMR for captures
[\[differences\]][290122-dif] `159`} | Elo: [32.07][290122-elo1] ±1.0
_{Ptnml: 10, 1009, 22681, 6049, 251
nElo: 93.05 ±2.5
PairsRatio: 6.18
[\[raw statistics\]][290122-raw1]} | Elo: [22.31][290122-elo8] ±1.0
_{Ptnml: 3, 496, 16495, 2945, 61
nElo: 76.78 ±3.0
PairsRatio: 6.02
[\[raw statistics\]][290122-raw8]} | | | 2022‑02‑10 | [master][100222-master] vs [Stockfish 14]
_{`Bench: 4919707`
Update architecture to "SFNNv4"
[\[differences\]][100222-dif] `166`} | Elo: [34.88][100222-elo1] ±1.0
_{Ptnml: 13, 884, 22430, 6432, 241
nElo: 100.85 ±2.5
PairsRatio: 7.44
[\[raw statistics\]][100222-raw1]} | Elo: [24.37][100222-elo8] ±1.0
_{Ptnml: 2, 416, 16441, 3061, 80
nElo: 83.29 ±2.9
PairsRatio: 7.51
[\[raw statistics\]][100222-raw8]} | | | 2022‑02‑17 | [master][170222-master] vs [Stockfish 14]
_{`Bench: 6318903`
Tune search at very long time control
[\[differences\]][170222-dif] `168`} | Elo: [33.07][170222-elo1] ±1.0
_{Ptnml: 17, 984, 22522, 6243, 234
nElo: 95.49 ±2.5
PairsRatio: 6.47
[\[raw statistics\]][170222-raw1]} | Elo: [23.83][170222-elo8] ±1.0
_{Ptnml: 4, 410, 16496, 3023, 67
nElo: 82.31 ±2.9
PairsRatio: 7.46
[\[raw statistics\]][170222-raw8]} | | | 2022‑03‑19 | [master][190322-master] vs [Stockfish 14]
_{`Bench: 7044203`
Remove ttPv tree shrinking
[\[differences\]][190322-dif] `180`} | Elo: [35.01][190322-elo1] ±1.0
_{Ptnml: 11, 801, 22566, 6395, 227
nElo: 102.62 ±2.5
PairsRatio: 8.16
[\[raw statistics\]][190322-raw1]} | | | 2022‑04‑17 | [master][170422-master] vs [Stockfish 14]
_{`Bench: 8129754`
Decrease LMR at PV nodes with low depth
[\[differences\]][170422-dif] `189`} | Elo: [36.69][170422-elo1] ±1.0
_{Ptnml: 5, 711, 22489, 6557, 238
nElo: 107.69 ±2.4
PairsRatio: 9.49
[\[raw statistics\]][170422-raw1]} | Elo: [26.09][170422-elo8] ±1.0
_{Ptnml: 1, 341, 16379, 3217, 62
nElo: 89.84 ±2.8
PairsRatio: 9.59
[\[raw statistics\]][170422-raw8]} | Elo: [91.22][170422-elo1uho] ±1.3
_{Ptnml: 17, 1335, 12388, 15750, 510
nElo: 205.62 ±3.6
PairsRatio: 12.03
[\[raw statistics\]][170422-raw1uho]} | | 2022‑04‑18 | [Stockfish 15] [[[https://stockfishchess.org/images/logo/icon_128x128.png\|width=20px]]][SF15RN] [[[https://github.githubassets.com/images/icons/emoji/unicode/1f4c8.png\|width=20px]]][SF15DP]
_{`Bench: 8129754`
[\[differences\]][180422-dif] `190`} | |

Stockfish 16 Development (2022-04-18 - 2023-06-29)

| `Date` | `Version` | `1 Thread` | `8 Threads` | `1 Thread (UHO)` | |:---:|:---:|:---:|:---:|:---:| | 2022‑05‑14 | [master][140522-master] vs [Stockfish 15]
_{`Bench: 6481017`
SE depth scaling using the previous depth
[\[differences\]][140522-dif] `9`} | Elo: [4.54][140522-elo1] ±0.8
_{Ptnml: 18, 1850, 25507, 2580, 45
nElo: 16.29 ±2.8
PairsRatio: 1.41
[\[raw statistics\]][140522-raw1]} | Elo: [3.12][140522-elo8] ±0.8
_{Ptnml: 5, 803, 18029, 1154, 9
nElo: 13.92 ±3.4
PairsRatio: 1.44
[\[raw statistics\]][140522-raw8]} | | | 2022‑06‑16 | [master][160622-master] vs [Stockfish 15]
_{`Bench: 5845802`
Simplify away condition in ttSave in probCut
[\[differences\]][160622-dif] `25`} | Elo: [5.72][160622-elo1] ±0.8
_{Ptnml: 31, 1838, 25288, 2799, 44
nElo: 19.99 ±2.8
PairsRatio: 1.52
[\[raw statistics\]][160622-raw1]} | | | | 2022‑07‑13 | [master][130722-master] vs [Stockfish 15]
_{`Bench: 5905619`
Update default net to nn-ad9b42354671.nnue
[\[differences\]][130722-dif] `34`} | Elo: [5.70][130722-elo1] ±0.8
_{Ptnml: 42, 1867, 25207, 2832, 52
nElo: 19.67 ±2.8
PairsRatio: 1.51
[\[raw statistics\]][130722-raw1]} | Elo: [4.86][130722-elo8] ±0.8
_{Ptnml: 3, 734, 17975, 1276, 12
nElo: 21.46 ±3.3
PairsRatio: 1.75
[\[raw statistics\]][130722-raw8]} | | | 2022‑08‑12 | [master][120822-master] vs [Stockfish 15]
_{`Bench: 5868987`
Remove an unneeded randomization of evals
[\[differences\]][120822-dif] `43`} | Elo: [7.18][120822-elo1] ±0.8
_{Ptnml: 48, 1784, 25112, 2993, 63
nElo: 24.44 ±2.8
PairsRatio: 1.67
[\[raw statistics\]][120822-raw1]} | Elo: [4.60][120822-elo8] ±0.8
_{Ptnml: 5, 737, 17987, 1265, 6
nElo: 20.43 ±3.4
PairsRatio: 1.71
[\[raw statistics\]][120822-raw8]} | Elo: [14.61][120822-elo1uho] ±1.3
_{Ptnml: 149, 5043, 17073, 7608, 127
nElo: 30.73 ±2.8
PairsRatio: 1.49
[\[raw statistics\]][120822-raw1uho]} | | 2022‑09‑07 | [master][070922-master] vs [Stockfish 15]
_{`Bench: 5609606`
VLTC tuning
[\[differences\]][070922-dif] `52`} | Elo: [6.87][070922-elo1] ±0.8
_{Ptnml: 40, 1796, 25154, 2958, 52
nElo: 23.61 ±2.8
PairsRatio: 1.64
[\[raw statistics\]][070922-raw1]} | Elo: [5.45][070922-elo8] ±0.8
_{Ptnml: 3, 732, 17913, 1339, 13
nElo: 23.68 ±3.3
PairsRatio: 1.84
[\[raw statistics\]][070922-raw8]} | | | 2022‑10‑05 | [master][051022-master] vs [Stockfish 15]
_{`Bench: 4114228`
Revert "Mix alpha and statScore for reduction"
[\[differences\]][051022-dif] `66`} | Elo: [6.86][051022-elo1] ±0.8
_{Ptnml: 21, 1580, 25632, 2727, 40
nElo: 25.04 ±2.7
PairsRatio: 1.73
[\[raw statistics\]][051022-raw1]} | Elo: [5.98][051022-elo8] ±0.8
_{Ptnml: 6, 643, 18015, 1329, 7
nElo: 26.72 ±3.3
PairsRatio: 2.06
[\[raw statistics\]][051022-raw8]} | | | 2022‑10‑30 | [master][301022-master] vs [Stockfish 15]
_{`Bench: 4271738`
Adjust reduction less at medium depths
[\[differences\]][301022-dif] `81`} | Elo: [8.52][301022-elo1] ±0.8
_{Ptnml: 23, 1469, 25573, 2884, 51
nElo: 30.84 ±2.7
PairsRatio: 1.97
[\[raw statistics\]][301022-raw1]} | Elo: [5.91][301022-elo8] ±0.7
_{Ptnml: 6, 589, 18129, 1271, 5
nElo: 27.24 ±3.3
PairsRatio: 2.14
[\[raw statistics\]][301022-raw8]} | Elo: [17.17][301022-elo1uho] ±1.8
_{Ptnml: 38, 2430, 8572, 3933, 27
nElo: 36.91 ±4.0
PairsRatio: 1.60
[\[raw statistics\]][301022-raw1uho]} | | 2022‑12‑02 | [master][021222-master] vs [Stockfish 15]
_{`Bench: 3467381`
Fix bestThread selection
[\[differences\]][021222-dif] `97`} | Elo: [7.46][021222-elo1] ±0.7
_{Ptnml: 21, 1389, 25902, 2657, 31
nElo: 28.19 ±2.7
PairsRatio: 1.91
[\[raw statistics\]][021222-raw1]} | Elo: [5.97][021222-elo8] ±0.7
_{Ptnml: 3, 573, 18164, 1254, 6
nElo: 27.83 ±3.3
PairsRatio: 2.19
[\[raw statistics\]][021222-raw8]} | Elo: [17.04][021222-elo1uho] ±1.3
_{Ptnml: 73, 4844, 17208, 7820, 55
nElo: 36.73 ±2.8
PairsRatio: 1.60
[\[raw statistics\]][021222-raw1uho]} | | 2022‑12‑04 | [Stockfish 15.1] [[[https://stockfishchess.org/images/logo/icon_128x128.png\|width=20px]]][SF151RN]
_{`Bench: 3467381`
[\[differences\]][041222-dif] `98`} | | | | | 2022‑12‑19 | [master][191222-master] vs [Stockfish 15]
_{`Bench: 3727508`
Sometimes do a reduced search if LMR is skipped
[\[differences\]][191222-dif] `119`} | Elo: [8.55][191222-elo1] ±0.8
_{Ptnml: 16, 1420, 25675, 2850, 39
nElo: 31.50 ±2.7
PairsRatio: 2.01
[\[raw statistics\]][191222-raw1]} | | | | 2023‑01‑01 | [master][010123-master] vs [Stockfish 15]
_{`Bench: 4015511`
Update default net to nn-60fa44e376d9.nnue
[\[differences\]][010123-dif] `126`} | Elo: [10.00][010123-elo1] ±0.8
_{Ptnml: 15, 1301, 25667, 2976, 41
nElo: 36.92 ±2.7
PairsRatio: 2.29
[\[raw statistics\]][010123-raw1]} | Elo: [7.10][010123-elo8] ±0.7
_{Ptnml: 6, 529, 18118, 1336, 11
nElo: 32.56 ±3.2
PairsRatio: 2.52
[\[raw statistics\]][010123-raw8]} | Elo: [23.55][010123-elo1uho] ±1.3
_{Ptnml: 59, 4354, 17132, 8377, 78
nElo: 51.05 ±2.8
PairsRatio: 1.92
[\[raw statistics\]][010123-raw1uho]} | | 2023‑01‑23 | [master][230123-master] vs [Stockfish 15]
_{`Bench: 3941848`
Update default net to nn-bc24c101ada0.nnue
[\[differences\]][230123-dif] `143`} | Elo: [11.37][230123-elo1] ±0.7
_{Ptnml: 9, 1127, 25786, 3048, 30
nElo: 42.95 ±2.7
PairsRatio: 2.71
[\[raw statistics\]][230123-raw1]} | Elo: [9.09][230123-elo8] ±0.8
_{Ptnml: 2, 484, 17984, 1526, 4
nElo: 40.84 ±3.2
PairsRatio: 3.15
[\[raw statistics\]][230123-raw8]} | Elo: [29.49][230123-elo1uho] ±1.3
_{Ptnml: 43, 3893, 17099, 8870, 95
nElo: 64.58 ±2.9
PairsRatio: 2.28
[\[raw statistics\]][230123-raw1uho]} | | 2023‑02‑09 | [master][090223-master] vs [Stockfish 15]
_{`Bench: 3841998`
Update default net to nn-1337b1adec5b.nnue
[\[differences\]][090223-dif] `162`} | Elo: [12.76][090223-elo1] ±0.8
_{Ptnml: 9, 1089, 25635, 3224, 43
nElo: 47.33 ±2.6
PairsRatio: 2.98
[\[raw statistics\]][090223-raw1]} | Elo: [8.49][090223-elo8] ±0.8
_{Ptnml: 2, 502, 18018, 1473, 5
nElo: 38.38 ±3.2
PairsRatio: 2.93
[\[raw statistics\]][090223-raw8]} | Elo: [32.71][090223-elo1uho] ±1.3
_{Ptnml: 44, 3760, 16821, 9269, 106
nElo: 71.26 ±2.9
PairsRatio: 2.46
[\[raw statistics\]][090223-raw1uho]} | | 2023‑02‑18 | [master][180223-master] vs [Stockfish 15]
_{`Bench: 4283297`
Remove one reduction call
[\[differences\]][180223-dif] `168`} | Elo: [12.58][180223-elo1] ±0.8
_{Ptnml: 11, 1127, 25591, 3221, 50
nElo: 46.26 ±2.6
PairsRatio: 2.87
[\[raw statistics\]][180223-raw1]} | | Elo: [31.91][180223-elo1uho] ±1.3
_{Ptnml: 47, 3828, 16804, 9225, 96
nElo: 69.38 ±2.9
PairsRatio: 2.41
[\[raw statistics\]][180223-raw1uho]} | | 2023‑02‑24 | [master][240223-master] vs [Stockfish 15]
_{`Bench: 4705194`
Search tuning at very long time control
[\[differences\]][240223-dif] `174`} | Elo: [11.69][240223-elo1] ±0.7
_{Ptnml: 10, 1151, 25692, 3105, 42
nElo: 43.51 ±2.6
PairsRatio: 2.71
[\[raw statistics\]][240223-raw1]} | Elo: [9.37][240223-elo8] ±0.8
_{Ptnml: 1, 455, 18013, 1526, 5
nElo: 42.48 ±3.1
PairsRatio: 3.36
[\[raw statistics\]][240223-raw8]} | Elo: [32.42][240223-elo1uho] ±1.3
_{Ptnml: 44, 3804, 16761, 9307, 84
nElo: 70.59 ±2.9
PairsRatio: 2.44
[\[raw statistics\]][240223-raw1uho]} | | 2023‑03‑19 | [master][190323-master] vs [Stockfish 15]
_{`Bench: 4980082`
Remove 'si' StateInfo variable/parameter.
[\[differences\]][190323-dif] `196`} | Elo: [13.36][190323-elo1] ±0.8
_{Ptnml: 9, 1098, 25532, 3300, 61
nElo: 48.75 ±2.6
PairsRatio: 3.04
[\[raw statistics\]][190323-raw1]} | Elo: [10.10][190323-elo8] ±0.8
_{Ptnml: 0, 460, 17934, 1589, 17
nElo: 44.63 ±3.1
PairsRatio: 3.49
[\[raw statistics\]][190323-raw8]} | Elo: [35.27][190323-elo1uho] ±1.3
_{Ptnml: 48, 3610, 16657, 9594, 91
nElo: 76.91 ±2.9
PairsRatio: 2.65
[\[raw statistics\]][190323-raw1uho]} | | 2023‑04‑01 | [master][010423-master] vs [Stockfish 15]
_{`Bench: 4380438`
Decrease Depth more for positions not in TT.
[\[differences\]][010423-dif] `211`} | Elo: [14.42][010423-elo1] ±0.8
_{Ptnml: 7, 1031, 25480, 3431, 51
nElo: 52.68 ±2.6
PairsRatio: 3.35
[\[raw statistics\]][010423-raw1]} | Elo: [9.90][010423-elo8] ±0.8
_{Ptnml: 2, 450, 17964, 1575, 9
nElo: 44.20 ±3.1
PairsRatio: 3.50
[\[raw statistics\]][010423-raw8]} | Elo: [37.37][010423-elo1uho] ±1.3
_{Ptnml: 48, 3485, 16555, 9815, 97
nElo: 81.54 ±2.9
PairsRatio: 2.81
[\[raw statistics\]][010423-raw1uho]} | | 2023‑04‑22 | [master][220423-master] vs [Stockfish 15]
_{`Bench: 3548023`
Less reduction for tt move.
[\[differences\]][220423-dif] `235`} | Elo: [14.60][220423-elo1] ±0.8
_{Ptnml: 9, 967, 25569, 3405, 50
nElo: 53.91 ±2.6
PairsRatio: 3.54
[\[raw statistics\]][220423-raw1]} | Elo: [11.32][220423-elo8] ±0.8
_{Ptnml: 0, 386, 17939, 1661, 14
nElo: 50.39 ±3.0
PairsRatio: 4.34
[\[raw statistics\]][220423-raw8]} | Elo: [38.07][220423-elo1uho] ±1.3
_{Ptnml: 27, 3392, 16687, 9793, 101
nElo: 83.87 ±2.9
PairsRatio: 2.89
[\[raw statistics\]][220423-raw1uho]} | | 2023‑05‑07 | [master][070523-master] vs [Stockfish 15]
_{`Bench: 3808503`
Refine deeper post-lmr searches
[\[differences\]][070523-dif] `244`} | Elo: [14.36][070523-elo1] ±0.8
_{Ptnml: 11, 1004, 25521, 3423, 41
nElo: 52.83 ±2.6
PairsRatio: 3.41
[\[raw statistics\]][070523-raw1]} | Elo: [10.63][070523-elo8] ±0.7
_{Ptnml: 0, 379, 18029, 1581, 11
nElo: 48.41 ±3.0
PairsRatio: 4.20
[\[raw statistics\]][070523-raw8]} | Elo: [39.62][070523-elo1uho] ±1.3
_{Ptnml: 34, 3309, 16568, 9988, 101
nElo: 87.17 ±2.9
PairsRatio: 3.02
[\[raw statistics\]][070523-raw1uho]} | | 2023‑06‑04 | [master][040623-master] vs [Stockfish 15]
_{`Bench: 2551691`
Move internal iterative reduction before probcut
[\[differences\]][040623-dif] `265`} | Elo: [15.01][040623-elo1] ±0.8
_{Ptnml: 9, 1037, 25355, 3552, 47
nElo: 54.25 ±2.6
PairsRatio: 3.44
[\[raw statistics\]][040623-raw1]} | Elo: [11.87][040623-elo8] ±0.8
_{Ptnml: 3, 362, 17908, 1720, 7
nElo: 52.68 ±3.0
PairsRatio: 4.73
[\[raw statistics\]][040623-raw8]} | Elo: [38.10][040623-elo1uho] ±1.3
_{Ptnml: 48, 3387, 16634, 9826, 105
nElo: 83.49 ±2.9
PairsRatio: 2.89
[\[raw statistics\]][040623-raw1uho]} | | 2023‑06‑12 | [master][120623-master] vs [Stockfish 15]
_{`Bench: 2370027`
Use block sparse input for the first layer.
[\[differences\]][120623-dif] `274`} | Elo: [17.57][120623-elo1] ±0.8
_{Ptnml: 10, 881, 25223, 3840, 46
nElo: 63.12 ±2.5
PairsRatio: 4.36
[\[raw statistics\]][120623-raw1]} | Elo: [13.95][120623-elo8] ±0.8
_{Ptnml: 1, 290, 17828, 1865, 16
nElo: 60.93 ±2.8
PairsRatio: 6.46
[\[raw statistics\]][120623-raw8]} | Elo: [44.18][120623-elo1uho] ±1.3
_{Ptnml: 45, 3031, 16345, 10449, 130
nElo: 97.20 ±3.0
PairsRatio: 3.44
[\[raw statistics\]][120623-raw1uho]} | | 2023‑06‑22 | [master][220623-master] vs [Stockfish 15]
_{`Bench: 2593605`
Update default net to nn-5af11540bbfe.nnue
[\[differences\]][220623-dif] `289`} | Elo: [18.30][220623-elo1] ±0.8
_{Ptnml: 3, 812, 25265, 3864, 56
nElo: 66.19 ±2.5
PairsRatio: 4.81
[\[raw statistics\]][220623-raw1]} | Elo: [14.33][220623-elo8] ±0.8
_{Ptnml: 3, 297, 17767, 1914, 19
nElo: 61.59 ±2.9
PairsRatio: 6.44
[\[raw statistics\]][220623-raw8]} | Elo: [47.03][220623-elo1uho] ±1.3
_{Ptnml: 26, 2938, 16102, 10805, 129
nElo: 103.71 ±3.0
PairsRatio: 3.69
[\[raw statistics\]][220623-raw1uho]} | | 2023‑06‑29 | [Stockfish 16] [[[https://stockfishchess.org/images/logo/icon_128x128.png\|width=20px]]][SF16RN] [[[https://github.githubassets.com/images/icons/emoji/unicode/1f4c8.png\|width=20px]]][SF16DP]
_{`Bench: 2593605`
[\[differences\]][290623-dif] `290`} | |

Stockfish 17 Development (2023-06-29 - 2024-09-06)

| `Date` | `Version` | `1 Thread` | `8 Threads` | |:---:|:---:|:---:|:---:| | 2023‑07‑19 | [master][190723-master] vs [Stockfish 16]
_{`Bench: 1727577`
Do more futility pruning for cutNodes that are not in TT
[\[differences\]][190723-dif] `41`} | Elo: [0.10][190723-elo1] ±1.4
_{Ptnml: 96, 6835, 16121, 6851, 97
nElo: 0.21 ±2.8
PairsRatio: 1.00
[\[raw statistics\]][190723-raw1]} | Elo: [2.10][190723-elo8] ±1.3
_{Ptnml: 30, 5872, 17820, 6261, 17
nElo: 4.64 ±2.8
PairsRatio: 1.06
[\[raw statistics\]][190723-raw8]} | 2023‑08‑13 | [master][130823-master] vs [Stockfish 16]
_{`Bench: 1447866`
Simplify material difference in evaluate
[\[differences\]][130823-dif] `68`} | Elo: [0.58][130823-elo1] ±1.4
_{Ptnml: 120, 6787, 16066, 6927, 100
nElo: 1.17 ±2.8
PairsRatio: 1.02
[\[raw statistics\]][130823-raw1]} | Elo: [2.08][130823-elo8] ±1.2
_{Ptnml: 15, 5797, 18021, 6147, 20
nElo: 4.65 ±2.8
PairsRatio: 1.06
[\[raw statistics\]][130823-raw8]} | 2023‑09‑11 | [master][110923-master] vs [Stockfish 16]
_{`Bench: 1603079`
Cleanup code after dropping ICC support in favor of ICX
[\[differences\]][110923-dif] `93`} | Elo: [7.66][110923-elo1] ±1.4
_{Ptnml: 86, 6160, 16212, 7429, 113
nElo: 15.68 ±2.8
PairsRatio: 1.21
[\[raw statistics\]][110923-raw1]} | Elo: [5.65][110923-elo8] ±1.2
_{Ptnml: 16, 5524, 17944, 6500, 16
nElo: 12.57 ±2.8
PairsRatio: 1.18
[\[raw statistics\]][110923-raw8]} | 2023‑09‑22 | [master][220923-master] vs [Stockfish 16]
_{`Bench: 1246812`
Update NNUE architecture to SFNNv8: L1-2560 nn-ac1dbea57aa3.nnue
[\[differences\]][220923-dif] `103`} | Elo: [3.33][220923-elo1] ±1.4
_{Ptnml: 106, 6534, 16134, 7131, 95
nElo: 6.78 ±2.8
PairsRatio: 1.09
[\[raw statistics\]][220923-raw1]} | Elo: [6.61][220923-elo8] ±1.3
_{Ptnml: 21, 5553, 17713, 6689, 24
nElo: 14.56 ±2.8
PairsRatio: 1.20
[\[raw statistics\]][220923-raw8]} | 2023‑10‑08 | [master][081023-master] vs [Stockfish 16]
_{`Bench: 1246560`
Skip futility pruning if ttMove has bad history
[\[differences\]][081023-dif] `119`} | Elo: [9.68][081023-elo1] ±1.4
_{Ptnml: 100, 6094, 15972, 7702, 132
nElo: 19.61 ±2.8
PairsRatio: 1.26
[\[raw statistics\]][081023-raw1]} | Elo: [10.30][081023-elo8] ±1.3
_{Ptnml: 13, 5168, 17868, 6930, 21
nElo: 22.90 ±2.8
PairsRatio: 1.34
[\[raw statistics\]][081023-raw8]} | 2023‑10‑23 | [master][231023-master] vs [Stockfish 16]
_{`Bench: 1241996`
Follow up Makefile changes for clang-format
[\[differences\]][231023-dif] `136`} | Elo: [10.47][231023-elo1] ±1.4
_{Ptnml: 94, 6071, 15901, 7801, 133
nElo: 21.17 ±2.8
PairsRatio: 1.29
[\[raw statistics\]][231023-raw1]} | Elo: [9.16][231023-elo8] ±1.3
_{Ptnml: 19, 5311, 17763, 6884, 23
nElo: 20.24 ± 2.8
ParsRatio: 1.30
[\[raw statistics\]][231023-raw8]} | 2023‑11‑03 | [master][031123-master] vs [Stockfish 16]
_{`Bench: 1330590`
Update pawn history based on static eval difference
[\[differences\]][031123-dif] `150`} | Elo: [10.57][031123-elo1] ±1.4
_{Ptnml: 112, 6018, 15922, 7829, 119
nElo: 21.38 ±2.8
PairsRatio: 1.30
[\[raw statistics\]][031123-raw1]} | Elo: [9.16][031123-elo8] ±1.3
_{Ptnml: 27, 5330, 17701, 6919, 23
nElo: 20.17 ±2.8
PairsRatio: 1.30
[\[raw statistics\]][031123-raw8]} | 2023‑12‑02 | [master][021223-master] vs [Stockfish 16]
_{`Bench: 1403703`
Tweak return value in futility pruning
[\[differences\]][021223-dif] `172`} | Elo: [12.59][021223-elo1] ±1.4
_{Ptnml: 93, 5810, 16029, 7966, 102
nElo: 25.70 ±2.8
PairsRatio: 1.37
[\[raw statistics\]][021223-raw1]} | Elo: [10.08][021223-elo8] ±1.3
_{Ptnml: 18, 5168, 17893, 6897, 24
nElo: 22.42 ±2.8
PairsRatio: 1.33
[\[raw statistics\]][021223-raw8]} | 2023‑12‑31 | [master][311223-master] vs [Stockfish 16]
_{`Bench: 1392883`
Tweak static eval history update
[\[differences\]][311223-dif] `202`} | Elo: [19.19][311223-elo1] ±1.4
_{Ptnml: 74, 5393, 15884, 8446, 203
nElo: 38.89 ±2.8
PairsRatio: 1.58
[\[raw statistics\]][311223-raw1]} | Elo: [16.82][311223-elo8] ±1.3
_{Ptnml: 13, 4672, 17747, 7535, 33
nElo: 37.42 ±2.8
PairsRatio: 1.62
[\[raw statistics\]][311223-raw8]} | 2024‑01‑07 | [master][070124-master] vs [Stockfish 16]
_{`Bench: 1438336`
Prefix abs with std::
[\[differences\]][070124-dif] `219`} | Elo: [25.53][070124-elo1] ±1.4
_{Ptnml: 58, 4917, 15789, 9038, 198
nElo: 52.14 ±2.8
PairsRatio: 1.86
[\[raw statistics\]][070124-raw1]} | Elo: [18.88][070124-elo8] ±1.3
_{Ptnml: 12, 4602, 17534, 7820, 32
nElo: 41.76 ±2.8
PairsRatio: 1.70
[\[raw statistics\]][070124-raw8]} | 2024‑01‑21 | [master][210124-master] vs [Stockfish 16]
_{`Bench: 1235377`
VLTC search tune
[\[differences\]][210124-dif] `242`} | Elo: [26.49][210124-elo1] ±1.4
_{Ptnml: 64, 4791, 15823, 9159, 163
nElo: 54.42 ±2.8
PairsRatio: 1.92
[\[raw statistics\]][210124-raw1]} | Elo: [22.91][210124-elo8] ±1.2
_{Ptnml: 12, 4114, 17807, 8046, 21
nElo: 51.64 ±2.8
PairsRatio: 1.96
[\[raw statistics\]][210124-raw8]} | 2024‑02‑11 | [master][110224-master] vs [Stockfish 16]
_{`Bench: 1027182`
Format code using clang-format
[\[differences\]][110224-dif] `269`} | Elo: [22.81][110224-elo1] ±1.4
_{Ptnml: 81, 5104, 15792, 8846, 177
nElo: 46.39 ±2.8
PairsRatio: 1.74
[\[raw statistics\]][110224-raw1]} | Elo: [22.13][110224-elo8] ±1.3
_{Ptnml: 22, 4312, 17524, 8112, 30
nElo: 49.11 ±2.8
PairsRatio: 1.88
[\[raw statistics\]][110224-raw8]} | 2024‑02‑17 | [master][170224-master] vs [Stockfish 16]
_{`Bench: 1303971`
Simplify PV node reduction
[\[differences\]][170224-dif] `276`} | Elo: [27.04][170224-elo1] ±1.4
_{Ptnml: 65, 4832, 15656, 9272, 175
nElo: 55.20 ±2.9
PairsRatio: 1.93
[\[raw statistics\]][170224-raw1]} | Elo: [27.03][170224-elo8] ±1.2
_{Ptnml: 16, 3891, 17544, 8517, 32
nElo: 60.62 ±2.9
PairsRatio: 2.19
[\[raw statistics\]][170224-raw8]} | 2024‑02‑24 | [Stockfish 16.1] [[[https://stockfishchess.org/images/logo/icon_128x128.png\|width=20px]]][SF161RN]
_{`Bench: 1303971`
[\[differences\]][240224-dif] `280`} | | | | | 2024‑03‑12 | [master][120324-master] vs [Stockfish 16]
_{`Bench: 1715522`
Search + Eval + Movepick Tune
[\[differences\]][120324-dif] `302`} | Elo: [27.13][120324-elo1] ±1.4
_{Ptnml: 79, 4801, 15674, 9257, 189
nElo: 55.27 ±2.9
PairsRatio: 1.94
[\[raw statistics\]][120324-raw1]} | Elo: [29.99][120324-elo8] ±1.2
_{Ptnml: 15, 3656, 17515, 8775, 39
nElo: 67.59 ±2.9
PairsRatio: 2.40
[\[raw statistics\]][120324-raw8]} | 2024‑03‑29 | [master][290324-master] vs [Stockfish 16]
_{`Bench: 1759189`
Simplify NMP Condition
[\[differences\]][290324-dif] `322`} | Elo: [27.73][290324-elo1] ±1.4
_{Ptnml: 80, 4736, 15703, 9287, 194
nElo: 56.57 ±2.9
PairsRatio: 1.97
[\[raw statistics\]][290324-raw1]} | Elo: [30.03][290324-elo8] ±1.2
_{Ptnml: 16, 3637, 17534, 8784, 29
nElo: 67.81 ±2.9
PairsRatio: 2.41
[\[raw statistics\]][290324-raw8]} | 2024‑04‑11 | [master][110424-master] vs [Stockfish 16]
_{`Bench: 1479416`
Simplify the depth-dependent part of the best value adjustment formula in main search
[\[differences\]][110424-dif] `333`} | Elo: [23.53][110424-elo1] ±1.4
_{Ptnml: 75, 5095, 15696, 8965, 169
nElo: 47.82 ±2.8
PairsRatio: 1.77
[\[raw statistics\]][110424-raw1]} | Elo: [35.27][110424-elo8] ±1.2
_{Ptnml: 10, 3235, 17465, 9255, 35
nElo: 80.49 ±2.9
PairsRatio: 2.86
[\[raw statistics\]][110424-raw8]} | 2024‑04‑24 | [master][240424-master] vs [Stockfish 16]
_{`Bench: 1836777`
Implement accumulator refresh table
[\[differences\]][240424-dif] `348`} | Elo: [32.04][240424-elo1] ±1.4
_{Ptnml: 51, 4471, 15578, 9709, 191
nElo: 65.84 ±2.9
PairsRatio: 2.19
[\[raw statistics\]][240424-raw1]} | Elo: [37.86][240424-elo8] ±1.2
_{Ptnml: 7, 3255, 17012, 9670, 56
nElo: 85.18 ±2.9
PairsRatio: 2.98
[\[raw statistics\]][240424-raw8]} | 2024‑05‑05 | [master][050524-master] vs [Stockfish 16]
_{`Bench: 2180675`
VVLTC search tune
[\[differences\]][050524-dif] `369`} | Elo: [28.90][050524-elo1] ±1.4
_{Ptnml: 70, 4716, 15571, 9451, 192
nElo: 58.87 ±2.9
PairsRatio: 2.01
[\[raw statistics\]][050524-raw1]} | Elo: [40.41][050524-elo8] ±1.2
_{Ptnml: 6, 3047, 16994, 9899, 54
nElo: 91.59 ±2.9
PairsRatio: 3.26
[\[raw statistics\]][050524-raw8]} | 2024‑05‑13 | [master][130524-master] vs [Stockfish 16]
_{`Bench: 1876282`
Optimize update_accumulator_refresh_cache()
[\[differences\]][130524-dif] `386`} | Elo: [28.23][130524-elo1] ±1.4
_{Ptnml: 94, 4694, 15651, 9376, 185
nElo: 57.50 ±2.9
PairsRatio: 2.00
[\[raw statistics\]][130524-raw1]} | Elo: [39.08][130524-elo8] ±1.2
_{Ptnml: 12, 3037, 17207, 9707, 37
nElo: 89.14 ±2.9
PairsRatio: 3.20
[\[raw statistics\]][130524-raw8]} | 2024‑05‑18 | [master][180524-master] vs [Stockfish 16]
_{`Bench: 1198142`
VVLTC search tune
[\[differences\]][180524-dif] `405`} | Elo: [26.54][180524-elo1] ±1.4
_{Ptnml: 78, 4876, 15650, 9185, 211
nElo: 53.85 ±2.8
PairsRatio: 1.90
[\[raw statistics\]][180524-raw1]} | Elo: [38.55][180524-elo8] ±1.2
_{Ptnml: 11, 3150, 17089, 9698, 52
nElo: 87.18 ±2.9
PairsRatio: 3.08
[\[raw statistics\]][180524-raw8]} | 2024‑05‑28 | [master][280524-master] vs [Stockfish 16]
_{`Bench: 1856147`
Improve performance on NUMA systems
[\[differences\]][280524-dif] `433`} | Elo: [30.13][280524-elo1] ±1.4
_{Ptnml: 65, 4557, 15687, 9504, 187
nElo: 61.85 ±2.9
PairsRatio: 2.10
[\[raw statistics\]][280524-raw1]} | Elo: [39.34][280524-elo8] ±1.2
_{Ptnml: 6, 3094, 17063, 9803, 34
nElo: 89.36 ±2.9
PairsRatio: 3.17
[\[raw statistics\]][280524-raw8]} | 2024‑06‑08 | [master][080624-master] vs [Stockfish 16]
_{`Bench: 1174094`
Make repeated bench runs identical
[\[differences\]][080624-dif] `490`} | Elo: [35.60][080624-elo1] ±1.4
_{Ptnml: 70, 4218, 15445, 10049, 218
nElo: 73.01 ±2.9
PairsRatio: 2.39
[\[raw statistics\]][080624-raw1]} | Elo: [39.31][080624-elo8] ±1.2
_{Ptnml: 15, 3169, 16895, 9884, 37
nElo: 88.49 ±2.9
PairsRatio: 3.12
[\[raw statistics\]][080624-raw8]} | 2024‑07‑01 | [master][010724-master] vs [Stockfish 16]
_{`Bench: 1227870`
Probcut in check no matter if pv or capture
[\[differences\]][010724-dif] `517`} | Elo: [40.07][010724-elo1] ±1.4
_{Ptnml: 83, 3933, 15243, 10493, 248
nElo: 82.11 ±2.9
PairsRatio: 2.67
[\[raw statistics\]][010724-raw1]} | Elo: [40.34][010724-elo8] ±1.2
_{Ptnml: 11, 3043, 16987, 9918, 41
nElo: 91.47 ±2.9
PairsRatio: 3.26
[\[raw statistics\]][010724-raw8]} | 2024‑07‑09 | [master][090724-master] vs [Stockfish 16]
_{`Bench: 1300471`
Move Loop Consistency in Probcut
[\[differences\]][090724-dif] `548`} | Elo: [41.51][090724-elo1] ±1.4
_{Ptnml: 68, 3769, 15319, 10649, 195
nElo: 86.22 ±3.0
PairsRatio: 2.83
[\[raw statistics\]][090724-raw1]} | Elo: [43.42][090724-elo8] ±1.2
_{Ptnml: 15, 2811, 16912, 10224, 38
nElo: 99.12 ±3.0
PairsRatio: 3.63
[\[raw statistics\]][090724-raw8]} | 2024‑07‑23 | [master][230724-master] vs [Stockfish 16]
_{`Bench: 1371485`
Update default main net to nn-31337bea577c.nnue
[\[differences\]][230724-dif] `578`} | Elo: [42.30][230724-elo1] ±1.4
_{Ptnml: 59, 3800, 15131, 10833, 177
nElo: 87.72 ±3.0
PairsRatio: 2.85
[\[raw statistics\]][230724-raw1]} | Elo: [45.06][230724-elo8] ±1.2
_{Ptnml: 14, 2685, 16907, 10337, 57
nElo: 103.20 ±3.0
PairsRatio: 3.85
[\[raw statistics\]][230724-raw8]} | 2024‑08‑20 | [master][200824-master] vs [Stockfish 16]
_{`Bench: 1484730`
Tweak late move extensions
[\[differences\]][200824-dif] `595`} | Elo: [44.12][200824-elo1] ±1.4
_{Ptnml: 69, 3686, 15064, 10960, 221
nElo: 91.20 ±3.0
PairsRatio: 2.98
[\[raw statistics\]][200824-raw1]} | Elo: [44.32][200824-elo8] ±1.2
_{Ptnml: 16, 2814, 16741, 10400, 29
nElo: 100.85 ±3.0
PairsRatio: 3.69
[\[raw statistics\]][200824-raw8]} | 2024‑09‑03 | [master][030924-master] vs [Stockfish 16]
_{`Bench: 1484730`
Update Top CPU Contributors
[\[differences\]][030924-dif] `601`} | Elo: [46.04][030924-elo1] ±1.3
_{Ptnml: 50, 3562, 15030, 11150, 208
nElo: 95.92 ±3.0
PairsRatio: 3.14
[\[raw statistics\]][030924-raw1]} | Elo: [42.62][030924-elo8] ±1.2
_{Ptnml: 15, 2882, 16912, 10147, 44
nElo: 96.95 ±3.0
PairsRatio: 3.52
[\[raw statistics\]][030924-raw8]} | 2024‑09‑06 | [Stockfish 17] [[[https://stockfishchess.org/images/logo/icon_128x128.png\|width=20px]]][SF17RN] [[[https://github.githubassets.com/images/icons/emoji/unicode/1f4c8.png\|width=20px]]][SF17DP]
_{`Bench: 1484730`
[\[differences\]][060924-dif] `602`} | |

--- ## External Links There are several pages on the web run by chess engine fans. Some collect progress of Stockfish over previous stable versions and development builds. Some compare Stockfish progress to other chess engines. Here is a collection of some useful links in that regard. * [Computer Chess Rating Lists (CCRL)](https://computerchess.org.uk/ccrl/4040/) * [FastGMs Rating Lists (FGRL)](http://www.fastgm.de) * [Ipman Chess](http://ipmanchess.yolasite.com) * [Mate Finding Effectiveness](https://github.com/vondele/matetrack) * [Next Chess Move (NCM)](https://nextchessmove.com/dev-builds) * [Stefan Pohl Computer Chess (SPCC)](https://www.sp-cc.de) [book-8mv3]: https://github.com/official-stockfish/books/blob/master/8moves_v3.pgn.zip [book-uho21epd]: https://github.com/official-stockfish/books/blob/master/UHO_XXL_%2B0.90_%2B1.19.epd.zip [book-uho4060v2]: https://github.com/official-stockfish/books/blob/master/UHO_4060_v2.epd.zip [book-uho4060v3]: https://github.com/official-stockfish/books/blob/master/UHO_4060_v3.epd.zip [Fishtest]: https://tests.stockfishchess.org/tests [Stockfish 2.3.1]:https://github.com/official-stockfish/Stockfish/commit/3caeabf73b12ad53ac7ba64122a2feab819c6527 [040313-dif]: https://github.com/official-stockfish/Stockfish/compare/3caeabf73b...10429dd616 [040313-elo1]: https://tests.stockfishchess.org/tests/view/51345f228f0c3e28913c9cf0 [040313-master]: https://github.com/official-stockfish/Stockfish/commit/10429dd616b97250107a64c1b91fdffee03e4790 [040313-raw1]: https://tests.stockfishchess.org/tests/stats/51345f228f0c3e28913c9cf0 [110313A-dif]: https://github.com/official-stockfish/Stockfish/compare/3caeabf73b...3698d9aa55 [110313A-elo1]: https://tests.stockfishchess.org/tests/view/5146bf698f0c3e3cad8ee607 [110313A-master]: https://github.com/official-stockfish/Stockfish/commit/3698d9aa5573ca666c238b7d31a48b2aeede43dd [110313A-raw1]: https://tests.stockfishchess.org/tests/stats/5146bf698f0c3e3cad8ee607 [110313B-dif]: https://github.com/official-stockfish/Stockfish/compare/3caeabf73b...a24da071f0 [110313B-elo1]: https://tests.stockfishchess.org/tests/view/513e4c258f0c3e7dc24b8186 [110313B-master]: https://github.com/official-stockfish/Stockfish/commit/a24da071f0d6128c633febab7df55f14475217c3 [110313B-raw1]: https://tests.stockfishchess.org/tests/stats/513e4c258f0c3e7dc24b8186 [160313-dif]: https://github.com/official-stockfish/Stockfish/compare/3caeabf73b...0586b51f9c [160313-elo1]: https://tests.stockfishchess.org/tests/view/51445c42e4721c1de2dc1246 [160313-master]: https://github.com/official-stockfish/Stockfish/commit/0586b51f9c398008f264d78a2888c0d68d9561cb [160313-raw1]: https://tests.stockfishchess.org/tests/stats/51445c42e4721c1de2dc1246 [240313-dif]: https://github.com/official-stockfish/Stockfish/compare/3caeabf73b...0b4ea54da9 [240313-elo1]: https://tests.stockfishchess.org/tests/view/514f7f3b8f0c3e4a8a33bf78 [240313-master]: https://github.com/official-stockfish/Stockfish/commit/0b4ea54da999e591284aaeec702b6239ca219b81 [240313-raw1]: https://tests.stockfishchess.org/tests/stats/514f7f3b8f0c3e4a8a33bf78 [300313-dif]: https://github.com/official-stockfish/Stockfish/compare/3caeabf73b...7d42d02ec7 [300313-elo1]: https://tests.stockfishchess.org/tests/view/515759308f0c3e3b5303952e [300313-master]: https://github.com/official-stockfish/Stockfish/commit/7d42d02ec77a03c4c1e1b399df30ef8b363c1237 [300313-raw1]: https://tests.stockfishchess.org/tests/stats/515759308f0c3e3b5303952e [030413-dif]: https://github.com/official-stockfish/Stockfish/compare/3caeabf73b...36c82b751c [030413-elo1]: https://tests.stockfishchess.org/tests/view/515c654a8f0c3e0a8a4b9d79 [030413-master]: https://github.com/official-stockfish/Stockfish/commit/36c82b751ce227c05bfb0dc74c311a469f7f8ec4 [030413-raw1]: https://tests.stockfishchess.org/tests/stats/515c654a8f0c3e0a8a4b9d79 [060413-dif]: https://github.com/official-stockfish/Stockfish/compare/3caeabf73b...889922041b [060413-elo1]: https://tests.stockfishchess.org/tests/view/515fb1708f0c3e20bb6b7b43 [060413-master]: https://github.com/official-stockfish/Stockfish/commit/889922041be317f26a2547498b6751ed55f0ee22 [060413-raw1]: https://tests.stockfishchess.org/tests/stats/515fb1708f0c3e20bb6b7b43 [070413-dif]: https://github.com/official-stockfish/Stockfish/compare/3caeabf73b...9498b2af82 [070413-elo1]: https://tests.stockfishchess.org/tests/view/516141648f0c3e3124ab6c73 [070413-master]: https://github.com/official-stockfish/Stockfish/commit/9498b2af82e51a42b5baf6579faeb66589be9ebb [070413-raw1]: https://tests.stockfishchess.org/tests/stats/516141648f0c3e3124ab6c73 [100413-dif]: https://github.com/official-stockfish/Stockfish/compare/3caeabf73b...fe72c93141 [100413-elo1]: https://tests.stockfishchess.org/tests/view/5165cbb68f0c3e5968ed27e9 [100413-master]: https://github.com/official-stockfish/Stockfish/commit/fe72c93141627c8109761da6546014a8d0461450 [100413-raw1]: https://tests.stockfishchess.org/tests/stats/5165cbb68f0c3e5968ed27e9 [190413-dif]: https://github.com/official-stockfish/Stockfish/compare/3caeabf73b...f84f04742a [190413-elo1]: https://tests.stockfishchess.org/tests/view/517105698f0c3e2dd765906d [190413-master]: https://github.com/official-stockfish/Stockfish/commit/f84f04742a30166c2751de28245e11922da132fb [190413-raw1]: https://tests.stockfishchess.org/tests/stats/517105698f0c3e2dd765906d [260413-dif]: https://github.com/official-stockfish/Stockfish/compare/3caeabf73b...e508494a99 [260413-elo1]: https://tests.stockfishchess.org/tests/view/517a569e8f0c3e13d8c85d32 [260413-master]: https://github.com/official-stockfish/Stockfish/commit/e508494a9985a5d54e77df694e8f160bb3346de3 [260413-raw1]: https://tests.stockfishchess.org/tests/stats/517a569e8f0c3e13d8c85d32 [280413-dif]: https://github.com/official-stockfish/Stockfish/compare/3caeabf73b...06b9140e5c [280413-elo1]: https://tests.stockfishchess.org/tests/view/517f5f538f0c3e0fd9df8d35 [280413-master]: https://github.com/official-stockfish/Stockfish/commit/06b9140e5ccd9e3579315ea2abb2ba93126c48fa [280413-raw1]: https://tests.stockfishchess.org/tests/stats/517f5f538f0c3e0fd9df8d35 [Stockfish 3]: https://github.com/official-stockfish/Stockfish/commit/aa2368a6878a867fe63247ee2adf2fde3dfe22be [SF3DP]: https://user-images.githubusercontent.com/64992190/156417306-225679a1-f73b-4dd8-9fc7-390cca2c6e4f.png "Development Progress" [SF3RN]: https://stockfishchess.org/blog/2013/stockfish-3/ "Release Notes" [300413-dif]: https://github.com/official-stockfish/Stockfish/compare/3caeabf73b...aa2368a687 [160513-dif]: https://github.com/official-stockfish/Stockfish/compare/aa2368a687...f7c013edd0 [160513-elo1]: https://tests.stockfishchess.org/tests/view/519547768f0c3e3efd273e4f [160513-master]: https://github.com/official-stockfish/Stockfish/commit/f7c013edd08a0e2d26491eb087c145e103e0f708 [160513-raw1]: https://tests.stockfishchess.org/tests/stats/519547768f0c3e3efd273e4f [230513-dif]: https://github.com/official-stockfish/Stockfish/compare/aa2368a687...d4a02b135d [230513-elo1]: https://tests.stockfishchess.org/tests/view/51a02c038f0c3e3acadfbb11 [230513-master]: https://github.com/official-stockfish/Stockfish/commit/d4a02b135deade2f3273716ccedb6f8a97316263 [230513-raw1]: https://tests.stockfishchess.org/tests/stats/51a02c038f0c3e3acadfbb11 [310513-dif]: https://github.com/official-stockfish/Stockfish/compare/aa2368a687...d8b266af8b [310513-elo1]: https://tests.stockfishchess.org/tests/view/51a8c12a8f0c3e6ac564d865 [310513-master]: https://github.com/official-stockfish/Stockfish/commit/d8b266af8b714a86b815bb83d2b47f038137d604 [310513-raw1]: https://tests.stockfishchess.org/tests/stats/51a8c12a8f0c3e6ac564d865 [230613-dif]: https://github.com/official-stockfish/Stockfish/compare/aa2368a687...17d41b3861 [230613-elo1]: https://tests.stockfishchess.org/tests/view/51c6daa18f0c3e355c8e0aef [230613-master]: https://github.com/official-stockfish/Stockfish/commit/17d41b386117f3b93daeb3a183f7a12e46812cdb [230613-raw1]: https://tests.stockfishchess.org/tests/stats/51c6daa18f0c3e355c8e0aef [030713-dif]: https://github.com/official-stockfish/Stockfish/compare/aa2368a687...a55fb76dcc [030713-elo1]: https://tests.stockfishchess.org/tests/view/51d459d10ebc590f75531fef [030713-master]: https://github.com/official-stockfish/Stockfish/commit/a55fb76dcc66c9cc17a81a9a99dd506108ee1fee [030713-raw1]: https://tests.stockfishchess.org/tests/stats/51d459d10ebc590f75531fef [130713-dif]: https://github.com/official-stockfish/Stockfish/compare/aa2368a687...4ede49cd85 [130713-elo1]: https://tests.stockfishchess.org/tests/view/51e17aad0ebc595218f6a77f [130713-master]: https://github.com/official-stockfish/Stockfish/commit/4ede49cd850392f28bc9da9537c111d2c3f0b297 [130713-raw1]: https://tests.stockfishchess.org/tests/stats/51e17aad0ebc595218f6a77f [190713-dif]: https://github.com/official-stockfish/Stockfish/compare/aa2368a687...4b3a0fdab0 [190713-elo1]: https://tests.stockfishchess.org/tests/view/51e8da3c0ebc59080383cfde [190713-master]: https://github.com/official-stockfish/Stockfish/commit/4b3a0fdab03a7529ede42891963d3036712a0bd5 [190713-raw1]: https://tests.stockfishchess.org/tests/stats/51e8da3c0ebc59080383cfde [250713-dif]: https://github.com/official-stockfish/Stockfish/compare/aa2368a687...7487eb0dca [250713-elo1]: https://tests.stockfishchess.org/tests/view/51f20d9b0ebc59080383d06a [250713-master]: https://github.com/official-stockfish/Stockfish/commit/7487eb0dcae93731330f06c7d289ca156487a16f [250713-raw1]: https://tests.stockfishchess.org/tests/stats/51f20d9b0ebc59080383d06a [030813-dif]: https://github.com/official-stockfish/Stockfish/compare/aa2368a687...f31847302d [030813-elo1]: https://tests.stockfishchess.org/tests/view/51ff4e6d0ebc59344346bf77 [030813-master]: https://github.com/official-stockfish/Stockfish/commit/f31847302d4ec62f4da7d22447d6c9fbf36230dc [030813-raw1]: https://tests.stockfishchess.org/tests/stats/51ff4e6d0ebc59344346bf77 [180813-dif]: https://github.com/official-stockfish/Stockfish/compare/aa2368a687...91c2c44fb1 [180813-elo1]: https://tests.stockfishchess.org/tests/view/521077fb0ebc593f4bb9a39d [180813-master]: https://github.com/official-stockfish/Stockfish/commit/91c2c44fb1987e3587a9b1037ce6a34369995ba2 [180813-raw1]: https://tests.stockfishchess.org/tests/stats/521077fb0ebc593f4bb9a39d [Stockfish 4]: https://github.com/official-stockfish/Stockfish/commit/4d120ee02edff250a6661e63d913e70efc37e2b6 [SF4DP]: https://user-images.githubusercontent.com/64992190/156417121-89472d65-0d79-496d-a660-8073de2f1e45.png "Development Progress" [SF4RN]: https://stockfishchess.org/blog/2013/stockfish-4/ "Release Notes" [200813-dif]: https://github.com/official-stockfish/Stockfish/compare/aa2368a687...4d120ee02e [290813-dif]: https://github.com/official-stockfish/Stockfish/compare/4d120ee02e...5d90c149b5 [290813-elo1]: https://tests.stockfishchess.org/tests/view/521fbafc0ebc5972cf4733d6 [290813-master]: https://github.com/official-stockfish/Stockfish/commit/5d90c149b5804403e5e8c1a25d0b37577b059712 [290813-raw1]: https://tests.stockfishchess.org/tests/stats/521fbafc0ebc5972cf4733d6 [010913-dif]: https://github.com/official-stockfish/Stockfish/compare/4d120ee02e...849b089a63 [010913-elo1]: https://tests.stockfishchess.org/tests/view/5224c2350ebc594ff262acc7 [010913-master]: https://github.com/official-stockfish/Stockfish/commit/849b089a63cb40833006704fb6e3fc66e8010dfa [010913-raw1]: https://tests.stockfishchess.org/tests/stats/5224c2350ebc594ff262acc7 [050913-dif]: https://github.com/official-stockfish/Stockfish/compare/4d120ee02e...10b53e1c5e [050913-elo1]: https://tests.stockfishchess.org/tests/view/5228bc7b0ebc5909cbaa79be [050913-master]: https://github.com/official-stockfish/Stockfish/commit/10b53e1c5e6aeba156eb5c02afccfd7db1f84d16 [050913-raw1]: https://tests.stockfishchess.org/tests/stats/5228bc7b0ebc5909cbaa79be [070913-dif]: https://github.com/official-stockfish/Stockfish/compare/4d120ee02e...0515ad0fb0 [070913-elo1]: https://tests.stockfishchess.org/tests/view/522bcb1c0ebc592ee68dc04a [070913-master]: https://github.com/official-stockfish/Stockfish/commit/0515ad0fb0f2d46ee60288b0541cea495e6c90ef [070913-raw1]: https://tests.stockfishchess.org/tests/stats/522bcb1c0ebc592ee68dc04a [110913-dif]: https://github.com/official-stockfish/Stockfish/compare/4d120ee02e...4803d5772c [110913-elo1]: https://tests.stockfishchess.org/tests/view/5230d4630ebc5963f25cba15 [110913-master]: https://github.com/official-stockfish/Stockfish/commit/4803d5772c120121dad6bad78cc2b6be5c24fb1f [110913-raw1]: https://tests.stockfishchess.org/tests/stats/5230d4630ebc5963f25cba15 [120913-dif]: 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