| !! latest version !! Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 for modern computers Windows x64 + SSSE3 Windows x64 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64 | Author: Syine Mineta
Date: Sat Sep 13 08:18:52 2025 +0200 Timestamp: 1757744332 Revert "Adjustment of the aspiration window after fail high/low." This reverts commit bfc7000597b8b5b0899e99bc911f6120a75c6297. Fixes https://github.com/official-stockfish/Stockfish/issues/6296 After this commit a bug has been reported when the position is close to mate or being mated. Since no workarounds have been suggested yet, it is best to revert this commit until a better solution is found. closes https://github.com/official-stockfish/Stockfish/pull/6309 Bench: 2493363 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 + SSSE3 Windows x64 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64 | Author: Stefan Geschwentner
Date: Sat Sep 6 07:57:57 2025 +0200 Timestamp: 1757138277 Adjustment of the aspiration window after fail high/low. For the new bound in the opposite direction of the fail, use a weighted average of alpha, beta and best value +- delta. In the case of a fail high, different average weights are used depending on whether or not there was a best move change during the last search. The weights are determined from the following two consecutive LTC tunings. First tuning: https://tests.stockfishchess.org/tests/view/68ab727975da51a345a5ac2e Second tuning: https://tests.stockfishchess.org/tests/view/68aba3fe75da51a345a5ad52 Passed LTC: LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 39504 W: 10243 L: 9947 D: 19314 Elo +2.60 Ptnml(0-2): 25, 4182, 11041, 4480, 24 https://tests.stockfishchess.org/tests/view/68acbb6d6217b8721dca95f8 Passed VLTC: LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 91196 W: 23574 L: 23167 D: 44455 Elo +1.55 Ptnml(0-2): 13, 8943, 27276, 9356, 10 https://tests.stockfishchess.org/tests/view/68af64786217b8721dca993d closes https://github.com/official-stockfish/Stockfish/pull/6292 Bench: 2785713 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 for modern computers Windows x64 + SSSE3 Windows x64 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64 | Author: Shawn Xu
Date: Sat Sep 6 07:55:14 2025 +0200 Timestamp: 1757138114 Reintroduce #6259 Reintroduces af181d9, which no longer regresses on matetrack after #6286 Using ./stockfish on matetrack.epd with --nodes 1000000 Engine ID: Stockfish dev-20250902-adfddd2c Total FENs: 6554 Found mates: 3490 Best mates: 2429 Passed Non-regression LTC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 37608 W: 9726 L: 9523 D: 18359 Elo +1.88 Ptnml(0-2): 16, 4001, 10578, 4182, 27 https://tests.stockfishchess.org/tests/view/68b886778f94a4e5a7fe77d9 closes https://github.com/official-stockfish/Stockfish/pull/6289 Bench: 2493363 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 + SSSE3 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64 | Author: Shawn Xu
Date: Tue Sep 2 20:42:03 2025 +0200 Timestamp: 1756838523 Add scaling note to STC/LTC tunes It has been repeatedly shown that such tunes are suspectible to become anti-scaling. Below are some recent examples: https://github.com/official-stockfish/Stockfish/commit/2e91a8635468e40c89a2303ce50384864d088611 https://github.com/official-stockfish/Stockfish/commit/d11f49b790429c236a1a4169f0d8052635fc03dc Passed STC: LLR: 2.95 (-2.94,2.94) <0.00,2.00> Total: 32448 W: 8651 L: 8342 D: 15455 Elo +3.31 Ptnml(0-2): 81, 3695, 8408, 3914, 126 https://tests.stockfishchess.org/tests/view/6899489b0049e8ccef9d64ad Passed LTC: LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 73854 W: 19042 L: 18649 D: 36163 Elo +1.85 Ptnml(0-2): 37, 7908, 20659, 8271, 52 https://tests.stockfishchess.org/tests/view/689abbe7fd8719b088c8d514 Revert VVLTC with STC bound: LLR: 2.95 (-2.94,2.94) <0.00,2.00> Total: 53802 W: 14030 L: 13740 D: 26032 Elo +1.87 Ptnml(0-2): 5, 4924, 16754, 5212, 6 https://tests.stockfishchess.org/tests/view/68a9a9f575da51a345a5a675 Revert VVLTC with LTC bound: LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 53658 W: 14022 L: 13699 D: 25937 Elo +2.09 Ptnml(0-2): 3, 4894, 16712, 5217, 3 https://tests.stockfishchess.org/tests/view/68a8d2b2b6fb3300203bca77 https://tests.stockfishchess.org/tests/view/688cf38bf17748b4d23c8057 https://tests.stockfishchess.org/tests/view/6890bc7792fcad741b804a19 Passed LTC: LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 74928 W: 19466 L: 19071 D: 36391 Elo +1.83 Ptnml(0-2): 37, 8048, 20901, 8439, 39 Failed Non-regression VLTC: LLR: -2.94 (-2.94,2.94) <-1.75,0.25> Total: 57704 W: 14643 L: 14928 D: 28133 Elo -1.72 Ptnml(0-2): 5, 5925, 17280, 5634, 8 https://tests.stockfishchess.org/tests/view/6890bc7792fcad741b804a19 (Note that an STC-tuned version passed non-regression, but was shortly simplified) https://github.com/official-stockfish/Stockfish/pull/6040 Passed STC: LLR: 2.93 (-2.94,2.94) <0.00,2.00> Total: 27776 W: 7352 L: 7054 D: 13370 Elo +3.73 Ptnml(0-2): 68, 3126, 7221, 3386, 87 https://tests.stockfishchess.org/tests/view/680ec0f83629b02d74b1605b Passed LTC: LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 161304 W: 41432 L: 40864 D: 79008 Elo +1.22 Ptnml(0-2): 61, 17305, 45357, 17863, 66 https://tests.stockfishchess.org/tests/view/680ec7f93629b02d74b16084 Failed Non-regression VVLTC: LLR: -2.94 (-2.94,2.94) <-1.75,0.25> Total: 313466 W: 80573 L: 81089 D: 151804 Elo -0.57 Ptnml(0-2): 38, 29689, 97782, 29199, 25 https://tests.stockfishchess.org/tests/view/6810d0533629b02d74b16756 https://github.com/official-stockfish/Stockfish/pull/5907 https://github.com/official-stockfish/Stockfish/pull/5887 Passed LTC with STC bounds: https://tests.stockfishchess.org/tests/view/67b115dd6c6b9e172ad1592f LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 75756 W: 19393 L: 19044 D: 37319 Elo +1.60 Ptnml(0-2): 60, 8251, 20913, 8588, 66 Passed LTC with LTC bounds: https://tests.stockfishchess.org/tests/view/67af5f5d6c6b9e172ad15765 LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 108126 W: 27880 L: 27412 D: 52834 Elo +1.50 Ptnml(0-2): 85, 11786, 29866, 12228, 98 Revert VVLTC w/ STC bounds: LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 56342 W: 14536 L: 14246 D: 27560 Elo +1.79 Ptnml(0-2): 7, 5061, 17741, 5359, 3 https://tests.stockfishchess.org/tests/view/67be4f8ad8d5c2c657c52d10 Revert VVLTC w/ LTC bounds: LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 66562 W: 17364 L: 17016 D: 32182 Elo +1.82 Ptnml(0-2): 3, 6145, 20637, 6493, 3 https://tests.stockfishchess.org/tests/view/67bcd25ff6b602bd7222ea40 closes https://github.com/official-stockfish/Stockfish/pull/6284 no functional change see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64 | Author: Shawn Xu
Date: Tue Sep 2 20:41:08 2025 +0200 Timestamp: 1756838468 Simplify SMP Reduction Passed Non-regression SMP STC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 232784 W: 59845 L: 59841 D: 113098 Elo +0.01 Ptnml(0-2): 289, 26459, 62934, 26379, 331 https://tests.stockfishchess.org/tests/view/68ab96bf75da51a345a5acd6 Passed Non-regression SMP LTC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 374270 W: 95978 L: 96113 D: 182179 Elo -0.13 Ptnml(0-2): 118, 38575, 109888, 38432, 122 https://tests.stockfishchess.org/tests/view/68abcf1c75da51a345a5adb6 closes https://github.com/official-stockfish/Stockfish/pull/6285 Bench: 2667107 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 for modern computers Windows x64 + SSSE3 Windows x64 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64 | Author: Shawn Xu
Date: Tue Sep 2 20:39:02 2025 +0200 Timestamp: 1756838342 simplify stalemate further Non-regression STC: LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 155200 W: 40650 L: 40562 D: 73988 Elo +0.20 Ptnml(0-2): 533, 17588, 41258, 17700, 521 https://tests.stockfishchess.org/tests/view/68abe11375da51a345a5adec Non-regression LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 82824 W: 21442 L: 21287 D: 40095 Elo +0.65 Ptnml(0-2): 51, 8738, 23675, 8901, 47 https://tests.stockfishchess.org/tests/view/68b205606217b8721dca9c8e 10k Stalemate: Elo: 1.46 ± 1.2 (95%) LOS: 99.0% Total: 10000 W: 4640 L: 4598 D: 762 Elo +1.46 Ptnml(0-2): 0, 140, 4678, 182, 0 https://tests.stockfishchess.org/tests/view/68b2059b6217b8721dca9c90 closes https://github.com/official-stockfish/Stockfish/pull/6283 Bench: 2431727 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 for modern computers Windows x64 + SSSE3 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64 | Author: Daniel Monroe
Date: Tue Sep 2 20:37:04 2025 +0200 Timestamp: 1756838224 Simplify sign term in quiet histories Simplify sign term in quiet histories Passed simplification STC LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 497824 W: 129130 L: 129418 D: 239276 Elo -0.20 Ptnml(0-2): 1546, 59040, 128008, 58792, 1526 https://tests.stockfishchess.org/tests/view/68a2a9c1b6fb3300203bc3ed Passed simplification LTC LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 70830 W: 18185 L: 18016 D: 34629 Elo +0.83 Ptnml(0-2): 36, 7658, 19861, 7821, 39 https://tests.stockfishchess.org/tests/view/68af36c96217b8721dca98d9 closes https://github.com/official-stockfish/Stockfish/pull/6282 Bench: 2393762 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 for modern computers Windows x64 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64 | Author: Joost VandeVondele
Date: Tue Sep 2 20:34:47 2025 +0200 Timestamp: 1756838087 limit dynamic reduction. fixes https://github.com/official-stockfish/Stockfish/issues/6280 prevents probcut from extending depth as analyzed here: https://github.com/official-stockfish/Stockfish/pull/6254#issuecomment-3239144280 passed STC: LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 86688 W: 22591 L: 22426 D: 41671 Elo +0.66 Ptnml(0-2): 305, 10125, 22311, 10306, 297 https://tests.stockfishchess.org/tests/view/68b418ab467ff96994ae4cd5 passed LTC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 82914 W: 21287 L: 21130 D: 40497 Elo +0.66 Ptnml(0-2): 39, 8959, 23305, 9114, 40 https://tests.stockfishchess.org/tests/view/68b47ffa78ed7a752a9e8f36 closes https://github.com/official-stockfish/Stockfish/pull/6286 Bench: 2787731 Co-Authored-By: xu-shawn <50402888+> see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 for modern computers Windows x64 + SSSE3 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64 | Author: Arseniy Surkov
Date: Sat Aug 30 15:17:57 2025 +0200 Timestamp: 1756559877 Simplify `adjust_key50` template Remove the AfterMove template from the adjust_key50 function, which is only ever called with false. closes https://github.com/official-stockfish/Stockfish/pull/6278 No functional change see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 for modern computers Windows x64 + SSSE3 Windows x64 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64 | Author: Sebastian Buchwald
Date: Sat Aug 30 15:14:51 2025 +0200 Timestamp: 1756559691 Remove superfluous cast closes https://github.com/official-stockfish/Stockfish/pull/6277 No functional change see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 for modern computers Windows x64 + SSSE3 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64 | Author: Torsten Hellwig
Date: Sat Aug 30 15:13:40 2025 +0200 Timestamp: 1756559620 Remove buggy and unused function The function does not fulfill its purpose and is not used anywhere. See https://discord.com/channels/435943710472011776/1101022188313772083/1409801409855094874 closes https://github.com/official-stockfish/Stockfish/pull/6275 no functional change see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64 | Author: Shawn Xu
Date: Sat Aug 30 15:12:06 2025 +0200 Timestamp: 1756559526 Further Simplify Stalemate Detection Passed Non-regression STC: LLR: 2.98 (-2.94,2.94) <-1.75,0.25> Total: 191520 W: 49633 L: 49582 D: 92305 Elo +0.09 Ptnml(0-2): 557, 20676, 53260, 20693, 574 https://tests.stockfishchess.org/tests/view/68ab570075da51a345a5abe1 Passed Non-regression LTC: LLR: 2.96 (-2.94,2.94) <-1.75,0.25> Total: 212934 W: 54643 L: 54618 D: 103673 Elo +0.04 Ptnml(0-2): 117, 22417, 61364, 22462, 107 https://tests.stockfishchess.org/tests/view/68ab84e975da51a345a5ac6b 10k Stalemate: Elo: 0.35 ± 1.2 (95%) LOS: 71.6% Total: 10000 W: 4602 L: 4592 D: 806 Elo +0.35 Ptnml(0-2): 0, 148, 4694, 158, 0 nElo: 1.99 ± 6.8 (95%) PairsRatio: 1.07 https://tests.stockfishchess.org/tests/view/68abeb8175da51a345a5af82 closes https://github.com/official-stockfish/Stockfish/pull/6268 Bench: 2420973 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 + SSSE3 Windows x64 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64 | Author: Shawn Xu
Date: Sat Aug 30 15:09:47 2025 +0200 Timestamp: 1756559387 Non-functional simplifications closes https://github.com/official-stockfish/Stockfish/pull/6267 No functional change Co-authored-by: Daniel Monroe <> see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 for modern computers Windows x64 + SSSE3 Windows x64 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64 | Author: Shawn Xu
Date: Sat Aug 30 15:09:00 2025 +0200 Timestamp: 1756559340 Simplify Capture Futility Pruning Passed Non-regression STC: LLR: 2.97 (-2.94,2.94) <-1.75,0.25> Total: 187904 W: 48639 L: 48583 D: 90682 Elo +0.10 Ptnml(0-2): 560, 22150, 48502, 22154, 586 https://tests.stockfishchess.org/tests/view/68aad56075da51a345a5a9e3 Passed Non-regression LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 94302 W: 24246 L: 24101 D: 45955 Elo +0.53 Ptnml(0-2): 44, 10274, 26371, 10417, 45 https://tests.stockfishchess.org/tests/view/68ab541975da51a345a5aacf closes https://github.com/official-stockfish/Stockfish/pull/6266 Bench: 2376717 see source |
| Windows x64 for Haswell CPUs Windows x64 + SSSE3 Windows x64 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64 | Author: Robert Nurnberg @ elitebook
Date: Sat Aug 30 15:06:57 2025 +0200 Timestamp: 1756559217 revert #6259 The recent commit af181d9 was merged as a simplification, but unfortunately hurts mate finding efficiency. https://github.com/vondele/matetrack/blob/69f5c5e8627c163a6a8480b869ee09bc44dc44d4/matetrack1000000.csv#L4075-L4076 So this PR proposes to revert it, while adding a comment in the code for future reference. closes https://github.com/official-stockfish/Stockfish/pull/6269 Bench: 2566711 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 for modern computers Windows x64 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64 | Author: Nonlinear2
Date: Sat Aug 30 15:05:11 2025 +0200 Timestamp: 1756559111 Avoid high rule50 count zeroing cutoffs If the depth is low enough, don't TT cut if the rule50 count is high and the TT move is zeroing. Passed STC: https://tests.stockfishchess.org/tests/view/68a8fdd8b6fb3300203bcb92 LLR: 3.05 (-2.94,2.94) <0.00,2.00> Total: 110304 W: 28805 L: 28402 D: 53097 Elo +1.27 Ptnml(0-2): 275, 11174, 31875, 11529, 299 Passed LTC: https://tests.stockfishchess.org/tests/view/68aa200f75da51a345a5a809 LLR: 3.00 (-2.94,2.94) <0.50,2.50> Total: 187956 W: 48489 L: 47928 D: 91539 Elo +1.04 Ptnml(0-2): 59, 16118, 61075, 16655, 71 closes https://github.com/official-stockfish/Stockfish/pull/6271 bench: 2641840 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 for modern computers Windows x64 + SSSE3 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64 | Author: Akshat Sinha
Date: Sat Aug 30 15:03:09 2025 +0200 Timestamp: 1756558989 fix ppc altivec check & loongarch64-lsx typo closes https://github.com/official-stockfish/Stockfish/pull/6276 No functional change see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 + SSSE3 Windows x64 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64 | Author: Sebastian Buchwald
Date: Sat Aug 30 15:02:05 2025 +0200 Timestamp: 1756558925 Use integer type for UCI spin values In particular, parse spin values as integers to avoid rounding errors. Fixes https://github.com/official-stockfish/Stockfish/issues/6263 closes https://github.com/official-stockfish/Stockfish/pull/6264 No functional change see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 for modern computers Windows x64 + SSSE3 Windows x64 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64 | Author: Shawn Xu
Date: Sun Aug 24 20:10:43 2025 +0200 Timestamp: 1756059043 Simplify LMR Extensions Passed Non-regression STC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 236896 W: 61683 L: 61683 D: 113530 Elo +0.00 Ptnml(0-2): 730, 28057, 60901, 28003, 757 https://tests.stockfishchess.org/tests/view/68a9c20475da51a345a5a6a0 Passed Non-regression LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 73644 W: 18936 L: 18770 D: 35938 Elo +0.78 Ptnml(0-2): 33, 7951, 20685, 8123, 30 https://tests.stockfishchess.org/tests/view/68aa95c575da51a345a5a88a closes https://github.com/official-stockfish/Stockfish/pull/6265 Bench: 2693376 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 for modern computers Windows x64 + SSSE3 Windows x64 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64 | Author: Stefan Geschwentner
Date: Sun Aug 24 20:07:50 2025 +0200 Timestamp: 1756058870 Less reduction for later threads. Give "(thread id mod 8) * 64" less reductions (up to nearly a half ply). Passed SMP STC: LLR: 2.95 (-2.94,2.94) <0.00,2.00> Total: 413176 W: 106496 L: 105666 D: 201014 Elo +0.70 Ptnml(0-2): 504, 46732, 111266, 47602, 484 https://tests.stockfishchess.org/tests/view/68a24aeeb6fb3300203bbdc4 Passed SMP LTC: LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 60420 W: 15622 L: 15268 D: 29530 Elo +2.04 Ptnml(0-2): 11, 6106, 17632, 6440, 21 https://tests.stockfishchess.org/tests/view/68a2c2ffb6fb3300203bc516 closes https://github.com/official-stockfish/Stockfish/pull/6249 No functional change see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 for modern computers Windows x64 + SSSE3 Windows x64 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64 | Author: FauziAkram
Date: Sun Aug 24 20:01:01 2025 +0200 Timestamp: 1756058461 Remove cap from a bonusScale formula Passed STC: LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 127264 W: 33159 L: 33042 D: 61063 Elo +0.32 Ptnml(0-2): 336, 14509, 33866, 14544, 377 https://tests.stockfishchess.org/tests/view/68a63fccb6fb3300203bc818 Passed LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 469512 W: 120094 L: 120331 D: 229087 Elo -0.18 Ptnml(0-2): 238, 51317, 131885, 51076, 240 https://tests.stockfishchess.org/tests/view/68a8d867b6fb3300203bcab5 closes https://github.com/official-stockfish/Stockfish/pull/6260 Bench: 2433974 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 + SSSE3 Windows x64 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64 | Author: Michael Chaly
Date: Sun Aug 24 19:58:49 2025 +0200 Timestamp: 1756058329 Small simplification in probCut movepicker Remove no longer required condition for tt moves. The idea is that if tt the value is greater than probCut beta try tt move that is a capture anyway - even if it doesn't pass SEE check. This idea in various implementations passed some STCs and was looking decent at LTCs as a gainer. Passed STC: https://tests.stockfishchess.org/tests/view/68aa1ee075da51a345a5a805 LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 136160 W: 35189 L: 35079 D: 65892 Elo +0.28 Ptnml(0-2): 436, 16083, 34891, 16275, 395 Passed LTC: https://tests.stockfishchess.org/tests/view/68aa91d375da51a345a5a884 LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 80022 W: 20652 L: 20492 D: 38878 Elo +0.69 Ptnml(0-2): 33, 8717, 22357, 8865, 39 closes https://github.com/official-stockfish/Stockfish/pull/6259 Bench: 2307940 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64 | Author: Shawn Xu
Date: Sun Aug 24 19:55:35 2025 +0200 Timestamp: 1756058135 Simplify separate malus formulas Passed Non-regression STC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 16352 W: 4336 L: 4090 D: 7926 Elo +5.23 Ptnml(0-2): 54, 1832, 4157, 2080, 53 https://tests.stockfishchess.org/tests/view/68a808f0b6fb3300203bca08 Passed Non-regression LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 94014 W: 24129 L: 23986 D: 45899 Elo +0.53 Ptnml(0-2): 47, 9917, 26934, 10064, 45 https://tests.stockfishchess.org/tests/view/68a8f45cb6fb3300203bcb5e closes https://github.com/official-stockfish/Stockfish/pull/6256 Bench: 2483704 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 for modern computers Windows x64 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64 | Author: Shawn Xu
Date: Sun Aug 24 19:52:42 2025 +0200 Timestamp: 1756057962 Simplify quiet move streak Passed Non-regression STC: LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 46272 W: 12076 L: 11866 D: 22330 Elo +1.58 Ptnml(0-2): 140, 5407, 11860, 5561, 168 https://tests.stockfishchess.org/tests/view/68a9c26575da51a345a5a6a2 Passed Non-regression LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 140442 W: 35984 L: 35886 D: 68572 Elo +0.24 Ptnml(0-2): 72, 15333, 39305, 15447, 64 https://tests.stockfishchess.org/tests/view/68aa245e75da51a345a5a80d closes https://github.com/official-stockfish/Stockfish/pull/6258 Bench: 2931171 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 for modern computers Windows x64 + SSSE3 Windows x64 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64 | Author: Shawn Xu
Date: Sun Aug 24 19:50:51 2025 +0200 Timestamp: 1756057851 Simplify stalemate detection Passed Non-regression STC: LLR: 2.96 (-2.94,2.94) <-1.75,0.25> Total: 107392 W: 27959 L: 27818 D: 51615 Elo +0.46 Ptnml(0-2): 317, 12094, 28735, 12231, 319 https://tests.stockfishchess.org/tests/view/68a65d8ab6fb3300203bc825 Passed Non-regression LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 94014 W: 24129 L: 23986 D: 45899 Elo +0.53 Ptnml(0-2): 47, 9917, 26934, 10064, 45 https://tests.stockfishchess.org/tests/view/68a8f45cb6fb3300203bcb5e Passed Stalemate 10k: Elo: 2.22 ± 1.3 (95%) LOS: 100.0% Total: 10000 W: 4626 L: 4562 D: 812 Elo +2.22 Ptnml(0-2): 1, 137, 4659, 203, 0 nElo: 12.00 ± 6.8 (95%) PairsRatio: 1.47 https://tests.stockfishchess.org/tests/view/68a65d8ab6fb3300203bc825 Supersedes #6114 Closes #6232 closes https://github.com/official-stockfish/Stockfish/pull/6255 Bench: 2473929 see source |