| !! 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: FauziAkram
Date: Thu Feb 13 20:18:35 2025 +0100 Timestamp: 1739474315 FutilityValue formula tweak Passed STC: LLR: 2.95 (-2.94,2.94) <0.00,2.00> Total: 29600 W: 7979 L: 7662 D: 13959 Elo +3.72 Ptnml(0-2): 138, 3446, 7324, 3745, 147 https://tests.stockfishchess.org/tests/view/67ac7dff52879dfd14d7e7da Passed LTC: LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 49662 W: 12850 L: 12502 D: 24310 Elo +2.43 Ptnml(0-2): 41, 5354, 13689, 5710, 37 https://tests.stockfishchess.org/tests/view/67acc1b252879dfd14d7e81d closes https://github.com/official-stockfish/Stockfish/pull/5879 Bench: 2581469 see source |
| 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: Daniel Monroe
Date: Thu Feb 13 20:17:26 2025 +0100 Timestamp: 1739474246 Decrease lmr depth if static eval decreases a lot This tweak originally had some more conditions which have been simplified away. Passed STC LLR: 2.93 (-2.94,2.94) <0.00,2.00> Total: 60064 W: 15797 L: 15439 D: 28828 Elo +2.07 Ptnml(0-2): 236, 7080, 15106, 7310, 300 https://tests.stockfishchess.org/tests/view/67a2af9cfedef70e42ac3325 Passed LTC LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 76794 W: 19740 L: 19337 D: 37717 Elo +1.82 Ptnml(0-2): 61, 8327, 21236, 8694, 79 https://tests.stockfishchess.org/tests/view/67a2c904fedef70e42ac374d Passed Non-Regression VVLTC scaling check LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 29046 W: 7581 L: 7389 D: 14076 Elo +2.30 Ptnml(0-2): 2, 2557, 9213, 2749, 2 https://tests.stockfishchess.org/tests/view/67a54b591c4a3ea87241cb83 Passed simplification STC LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 212448 W: 55244 L: 55217 D: 101987 Elo +0.04 Ptnml(0-2): 932, 25283, 53707, 25430, 872 https://tests.stockfishchess.org/tests/view/67aaacb02554387b116f698f Passed simplification LTC LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 185736 W: 47270 L: 47217 D: 91249 Elo +0.10 Ptnml(0-2): 141, 20568, 51394, 20627, 138 https://tests.stockfishchess.org/tests/view/67ab8efa133d55b1d3bc1397 closes https://github.com/official-stockfish/Stockfish/pull/5878 Bench: 2512420 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: Nonlinear2
Date: Thu Feb 13 19:52:06 2025 +0100 Timestamp: 1739472726 Tweak the cutnode depth condition for TT cutoffs Passed STC: https://tests.stockfishchess.org/tests/view/67ab396ab5c93ee812d851f3 LLR: 2.96 (-2.94,2.94) <0.00,2.00> Total: 83648 W: 21964 L: 21571 D: 40113 Elo +1.63 Ptnml(0-2): 339, 9779, 21217, 10128, 361 Passed LTC: https://tests.stockfishchess.org/tests/view/67ab9647133d55b1d3bc171e LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 68160 W: 17551 L: 17166 D: 33443 Elo +1.96 Ptnml(0-2): 62, 7353, 18870, 7728, 67 closes https://github.com/official-stockfish/Stockfish/pull/5876 Bench: 3087275 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: Michael Chaly
Date: Thu Feb 13 19:49:54 2025 +0100 Timestamp: 1739472594 Do more reductions for cut nodes without a tt move Logic is somewhat similar to IIR but in LMR. Usually things like reducing more in IIR scale badly but this patch does this in LMR where reducing more for cutNodes is in general good, so I believe there is no non-linear scaling. Passed STC: https://tests.stockfishchess.org/tests/view/67abc9aaa04df5eb8dbeb452 LLR: 2.93 (-2.94,2.94) <0.00,2.00> Total: 42304 W: 11223 L: 10892 D: 20189 Elo +2.72 Ptnml(0-2): 184, 4904, 10669, 5187, 208 Passed LTC: https://tests.stockfishchess.org/tests/view/67abcd7ba04df5eb8dbeb96c LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 32334 W: 8386 L: 8074 D: 15874 Elo +3.35 Ptnml(0-2): 26, 3446, 8916, 3748, 31 closes https://github.com/official-stockfish/Stockfish/pull/5875 Bench: 2612849 see source |
| 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: Thu Feb 13 19:46:53 2025 +0100 Timestamp: 1739472413 Refactor reduction rules Refactor reduction rules so that all ttPv/Pv related stuff is in one rule and the scaling becomes more clear. No functional change closes https://github.com/official-stockfish/Stockfish/pull/5871 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: Daniel Monroe
Date: Thu Feb 13 19:45:55 2025 +0100 Timestamp: 1739472355 Simplify opponent worsening Passed simplification STC LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 57120 W: 14712 L: 14526 D: 27882 Elo +1.13 Ptnml(0-2): 53, 6241, 15796, 6407, 63 https://tests.stockfishchess.org/tests/view/67a26153eb183d11c659454d Passed simplification LTC LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 313452 W: 79893 L: 79973 D: 153586 Elo -0.09 Ptnml(0-2): 279, 35053, 86156, 34945, 293 https://tests.stockfishchess.org/tests/view/67a29fe0fedef70e42ac32ae closes https://github.com/official-stockfish/Stockfish/pull/5867 Bench: 2582245 see source |
| 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: Carlos Esparza
Date: Thu Feb 13 19:44:53 2025 +0100 Timestamp: 1739472293 Remove two xors by setting the hash keys for unreachable squares to zero performance before: 3.6714 +- 0.20% Gcycles 3.6620 +- 0.12% Gcycles 3.6704 +- 0.26% Gcycles 3.6602 +- 0.27% Gcycles 3.6799 +- 0.37% Gcycles after: 3.6540 +- 0.30% Gcycles 3.6388 +- 0.25% Gcycles 3.6557 +- 0.17% Gcycles 3.6449 +- 0.15% Gcycles 3.6460 +- 0.26% Gcycles (every line is a different `profile-build` and shows the number of cycles needed for `./stockfish bench`, measured with `perf stat -r 10`) closes https://github.com/official-stockfish/Stockfish/pull/5754 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: Wed Feb 5 19:00:25 2025 +0100 Timestamp: 1738778425 Increase PCM bonus when cutOffCnt is low Passed STC: LLR: 2.95 (-2.94,2.94) <0.00,2.00> Total: 36832 W: 9763 L: 9438 D: 17631 Elo +3.07 Ptnml(0-2): 159, 4267, 9254, 4562, 174 https://tests.stockfishchess.org/tests/view/67a29dbafedef70e42ac329a Passed LTC: LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 19728 W: 5124 L: 4839 D: 9765 Elo +5.02 Ptnml(0-2): 18, 2029, 5485, 2314, 18 https://tests.stockfishchess.org/tests/view/67a2a1abfedef70e42ac32b7 closes https://github.com/official-stockfish/Stockfish/pull/5865 Bench: 3197798 see source |
| 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: Daniel Monroe
Date: Wed Feb 5 18:56:12 2025 +0100 Timestamp: 1738778172 Remove non-pawn material check in qsearch pruning Passed simplification STC LLR: 2.96 (-2.94,2.94) <-1.75,0.25> Total: 47712 W: 12621 L: 12409 D: 22682 Elo +1.54 Ptnml(0-2): 224, 5349, 12480, 5597, 206 https://tests.stockfishchess.org/tests/view/67a1b4fb612069de394afc37 Passed rebased simplification LTC LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 188274 W: 47727 L: 47677 D: 92870 Elo +0.09 Ptnml(0-2): 171, 20429, 52867, 20519, 151 https://tests.stockfishchess.org/tests/view/67a2a761fedef70e42ac3300 closes https://github.com/official-stockfish/Stockfish/pull/5866 bench 2654242 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 for modern computers Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64 | Author: Disservin
Date: Wed Feb 5 18:52:28 2025 +0100 Timestamp: 1738777948 Show stdout/stderr in CI/CD tests makes it easier to fix based on warnings shown with e.g. valgrind closes https://github.com/official-stockfish/Stockfish/pull/5862 No functional change see source |
| Windows x64 for Haswell CPUs 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: Disservin
Date: Tue Feb 4 23:08:43 2025 +0100 Timestamp: 1738706923 Fixes a wrongly combined merge conflict from the previous merge wave. Passed STC: https://tests.stockfishchess.org/tests/view/67a288aaeb183d11c65945f1 LLR: 2.99 (-2.94,2.94) <0.00,2.00> Total: 51424 W: 13588 L: 13237 D: 24599 Elo +2.37 Ptnml(0-2): 223, 6039, 12860, 6344, 246 Passed LTC: https://tests.stockfishchess.org/tests/view/67a28c0aeb183d11c6594609 LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 54144 W: 13900 L: 13543 D: 26701 Elo +2.29 Ptnml(0-2): 42, 5881, 14870, 6236, 43 closes https://github.com/official-stockfish/Stockfish/pull/5863 Bench: 2345723 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: Michael Chaly
Date: Tue Feb 4 21:37:11 2025 +0100 Timestamp: 1738701431 Reduce less for positions without tt move Continuation of work on scaling. In line with previous scaling patches this one massively reduces reduction for moves that don't go thru lmr for position without a tt move. Passed VVLTC with STC bounds: https://tests.stockfishchess.org/tests/view/679fd2450774dfd78deb12b2 LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 74718 W: 19354 L: 19042 D: 36322 Elo +1.45 Ptnml(0-2): 5, 6724, 23595, 7024, 11 Passed VVLTC with LTC bounds: https://tests.stockfishchess.org/tests/view/67a009930774dfd78deb2346 LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 82638 W: 21587 L: 21212 D: 39839 Elo +1.58 Ptnml(0-2): 15, 7476, 25953, 7869, 6 closes https://github.com/official-stockfish/Stockfish/pull/5860 Bench: 2887850 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: Tue Feb 4 21:34:08 2025 +0100 Timestamp: 1738701248 VVLTC parameters tweak Some notes: - Both tests were conducted on top of #5848. - Based on tuning suggestions, the extension for capturing the previously moved piece was removed/simplified. (Developers can attempt to reintroduce it post-merge if needed.) - Initially, bonusScale = std::max(bonusScale, -2); was included but later removed in the second test upon Viz's request, however, it was nearly non-functional anyway. Passed VVLTC under STC bounds: LLR: 2.95 (-2.94,2.94) <0.00,2.00> Total: 31508 W: 8153 L: 7895 D: 15460 Elo +2.85 Ptnml(0-2): 1, 2747, 10005, 2995, 6 https://tests.stockfishchess.org/tests/view/679fdc7a0774dfd78deb1350 Passed VVLTC under LTC bounds: LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 55026 W: 14370 L: 14046 D: 26610 Elo +2.05 Ptnml(0-2): 7, 4957, 17262, 5279, 8 https://tests.stockfishchess.org/tests/view/679fec920774dfd78deb19b8 closes https://github.com/official-stockfish/Stockfish/pull/5856 Bench: 2757788 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: Viren6
Date: Tue Feb 4 21:30:54 2025 +0100 Timestamp: 1738701054 Increment cutoffCnt less often after fail high Only increment when extension is less than 2 or it's a PvNode. Tested vs #5851. Failed STC: LLR: -2.97 (-2.94,2.94) <0.00,2.00> Total: 360064 W: 94546 L: 94271 D: 171247 Elo +0.27 Ptnml(0-2): 1835, 42826, 90314, 43343, 1714 https://tests.stockfishchess.org/tests/view/679f79cc0774dfd78deb1112 Passed LTC: LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 443076 W: 113942 L: 113081 D: 216053 Elo +0.68 Ptnml(0-2): 480, 49076, 121579, 49909, 494 https://tests.stockfishchess.org/tests/view/679fa21b0774dfd78deb1178 Passed VLTC: LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 187184 W: 48098 L: 47495 D: 91591 Elo +1.12 Ptnml(0-2): 59, 19036, 54792, 19653, 52 https://tests.stockfishchess.org/tests/view/679fb6000774dfd78deb11e8 closes https://github.com/official-stockfish/Stockfish/pull/5855 Bench: 3018089 see source |
| 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: Michael Chaly
Date: Tue Feb 4 21:28:49 2025 +0100 Timestamp: 1738700929 Do less aggressive pruning for higher movecounts Move part of heuristic that makes reduction less before pruning stage. Passed STC: https://tests.stockfishchess.org/tests/view/679fdf1b0774dfd78deb13b3 LLR: 2.93 (-2.94,2.94) <0.00,2.00> Total: 47136 W: 12484 L: 12146 D: 22506 Elo +2.49 Ptnml(0-2): 211, 5472, 11866, 5806, 213 Passed LTC: https://tests.stockfishchess.org/tests/view/679fe6790774dfd78deb1753 LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 100536 W: 25837 L: 25383 D: 49316 Elo +1.57 Ptnml(0-2): 103, 10990, 27622, 11456, 97 closes https://github.com/official-stockfish/Stockfish/pull/5853 Bench: 3265587 see source |
| 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: Kenneth Lee
Date: Tue Feb 4 21:26:04 2025 +0100 Timestamp: 1738700764 Simplify cutoffCnt further Based off [Simplify cutoffCnt](https://github.com/official-stockfish/Stockfish/commit/69be04d38e10003853e78e4aa2b32aa252a82850) commit Original [commit](https://github.com/kennethlee33/Stockfish/commit/a77a895c3b7460f86b11a3ddfe3528f5be1276b9) adding extension condition seems to not be improving strength anymore Passed STC: LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 54176 W: 14331 L: 14125 D: 25720 Elo +1.32 Ptnml(0-2): 261, 6340, 13676, 6554, 257 https://tests.stockfishchess.org/tests/view/679edb7c0774dfd78deb0eed Passed LTC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 267198 W: 68148 L: 68179 D: 130871 Elo -0.04 Ptnml(0-2): 232, 30051, 73055, 30038, 223 https://tests.stockfishchess.org/tests/view/679ef2c70774dfd78deb0f43 closes https://github.com/official-stockfish/Stockfish/pull/5851 Bench: 3119355 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: Nonlinear2
Date: Tue Feb 4 21:24:06 2025 +0100 Timestamp: 1738700646 Simplify bonusScale formula Passed STC: https://tests.stockfishchess.org/tests/view/679ea7bc0774dfd78deb0d68 LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 47680 W: 12575 L: 12364 D: 22741 Elo +1.54 Ptnml(0-2): 179, 5589, 12139, 5708, 225 Passed LTC: https://tests.stockfishchess.org/tests/view/679eb7760774dfd78deb0dbb LLR: 2.96 (-2.94,2.94) <-1.75,0.25> Total: 314220 W: 80110 L: 80189 D: 153921 Elo -0.09 Ptnml(0-2): 265, 35121, 86420, 35036, 268 closes https://github.com/official-stockfish/Stockfish/pull/5849 Bench: 3161782 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: Tue Feb 4 21:22:08 2025 +0100 Timestamp: 1738700528 Reduce full depth search twice Passed STC: https://tests.stockfishchess.org/tests/view/679f429e0774dfd78deb10a5 LLR: 2.95 (-2.94,2.94) <0.00,2.00> Total: 71584 W: 18905 L: 18529 D: 34150 Elo +1.82 Ptnml(0-2): 302, 8372, 18081, 8722, 315 Passed LTC: https://tests.stockfishchess.org/tests/view/679f72a00774dfd78deb1102 LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 353952 W: 91007 L: 90024 D: 172921 Elo +0.96 Ptnml(0-2): 375, 39163, 96921, 40138, 379 closes https://github.com/official-stockfish/Stockfish/pull/5848 Bench: 3642363 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: Disservin
Date: Tue Feb 4 21:18:01 2025 +0100 Timestamp: 1738700281 Disallow same option being added twice Now exits during startup. ``` ./stockfish Stockfish dev-20250202-243c7c6a by the Stockfish developers (see AUTHORS file) x1,5,0,10,0.5,0.0020 Option: "x1" was already added! ``` i.e. prevents and helps debug this case ```cpp int x1 = 5; TUNE(x1); TUNE(x1); ``` closes https://github.com/official-stockfish/Stockfish/pull/5847 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: Tue Feb 4 21:11:37 2025 +0100 Timestamp: 1738699897 Simplify depth increase condition further Passed Non-regression STC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 51232 W: 13560 L: 13351 D: 24321 Elo +1.42 Ptnml(0-2): 183, 6075, 12920, 6226, 212 https://tests.stockfishchess.org/tests/view/679d7b2b0774dfd78deb043f Passed Non-regression LTC (v. #5827): LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 172398 W: 44108 L: 44042 D: 84248 Elo +0.13 Ptnml(0-2): 122, 19207, 47489, 19245, 136 https://tests.stockfishchess.org/tests/view/679d7fb10774dfd78deb05d2 Passed Non-regression VLTC (v. #5827): LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 388540 W: 99314 L: 99464 D: 189762 Elo -0.13 Ptnml(0-2): 89, 40454, 113350, 40272, 105 https://tests.stockfishchess.org/tests/view/679da3be0774dfd78deb0ad4 closes https://github.com/official-stockfish/Stockfish/pull/5846 Bench: 2688175 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: Guenther Demetz
Date: Tue Feb 4 21:11:05 2025 +0100 Timestamp: 1738699865 Micro-optimization for SEE: remove a superfluous condition This condition can never be true, it's superfluous. It never triggers even with a bench 16 1 20 run. To met the condition it would imply that the previous recapture was done by a higher rated piece than a Queen. This is only the case when the King recaptures and that's already handled in line 1161: (return (attackers & ~pieces(stm)) ? res ^ 1). closes https://github.com/official-stockfish/Stockfish/pull/5839 No functional change 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: Robert Nurnberg @ elitebook
Date: Sun Feb 2 13:54:04 2025 +0100 Timestamp: 1738500844 Add cursed win checks to CI matetrack tests This PR adds a run for the `matecheck.py` script from the matetrack repo with the option `--syzygy50MoveRule false`. The new tests guard against a re-introduction of the bugs recently fixed by https://github.com/official-stockfish/Stockfish/pull/5814. closes https://github.com/official-stockfish/Stockfish/pull/5829 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: Kenneth Lee
Date: Sun Feb 2 13:52:16 2025 +0100 Timestamp: 1738500736 Simplify extensions depth increase condition Passed STC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 42784 W: 11198 L: 10979 D: 20607 Elo +1.78 Ptnml(0-2): 166, 5024, 10822, 5185, 195 https://tests.stockfishchess.org/tests/view/6795b6f8f6281b7d7b1869d6 Failed LTC: LLR: -2.95 (-2.94,2.94) <-1.75,0.25> Total: 283614 W: 72046 L: 72587 D: 138981 Elo -0.66 Ptnml(0-2): 241, 32097, 77647, 31606, 216 https://tests.stockfishchess.org/tests/view/6795cbb6f6281b7d7b186a07 Passed VLTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 59678 W: 15387 L: 15211 D: 29080 Elo +1.02 Ptnml(0-2): 23, 6169, 17273, 6357, 17 https://tests.stockfishchess.org/tests/view/6795c6dbf6281b7d7b1869f9 closes https://github.com/official-stockfish/Stockfish/pull/5827 Bench: 3088494 see source |
| 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: Disservin
Date: Sun Feb 2 13:49:54 2025 +0100 Timestamp: 1738500594 Silence clang-format issue No functional change 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: Michael Chaly
Date: Sun Feb 2 13:47:52 2025 +0100 Timestamp: 1738500472 Make pruning at ttpv nodes more aggressive Continuation of work done by @FauziAkram and @Viren6 They had a series of patches that decrease pruning for ttPv nodes - and it passed as a gainer at lower time controls while revert passed as a gainer at higher time controls. So it's a logical continuation of this work that increases pruning for ttPv nodes in hopes of scaling to longer TCs. Fixed games STC: https://tests.stockfishchess.org/tests/view/679ee3910774dfd78deb0efd Elo: -4.98 ± 2.1 (95%) LOS: 0.0% Total: 28584 W: 7229 L: 7639 D: 13716 Elo -4.98 Ptnml(0-2): 143, 3579, 7219, 3247, 104 nElo: -9.54 ± 4.0 (95%) PairsRatio: 0.90 Passed VVLTC with STC bounds: https://tests.stockfishchess.org/tests/view/679d21f70774dfd78deaf553 LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 323282 W: 83729 L: 83105 D: 156448 Elo +0.67 Ptnml(0-2): 37, 29842, 101269, 30446, 47 Passed VVLTC with LTC bounds: https://tests.stockfishchess.org/tests/view/679e7a970774dfd78deb0cd3 LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 113712 W: 29485 L: 29051 D: 55176 Elo +1.33 Ptnml(0-2): 13, 10376, 35640, 10818, 9 closes https://github.com/official-stockfish/Stockfish/pull/5844 Bench: 2964045 see source |