| 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: Shahin M. Shahin
Date: Tue Aug 22 11:32:51 2023 +0200 Timestamp: 1692696771 Reduce repetitions branches Increase reduction on retrying a move we just retreated that falls in a repetition: if current move can be the same move from previous previous turn then we retreated that move on the previous turn, this patch increases reduction if retrying that move results in a repetition. How to continue from there? Maybe we some variants of this idea could bring Elo too (only testing the destination square, or triangulations, etc.) Passed STC: https://tests.stockfishchess.org/tests/view/64e1aede883cbb7cbd9ad976 LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 424000 W: 108675 L: 107809 D: 207516 Elo +0.71 Ptnml(0-2): 1296, 47350, 113896, 48108, 1350 Passed LTC: https://tests.stockfishchess.org/tests/view/64e32d629970091252666872 LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 89682 W: 22976 L: 22569 D: 44137 Elo +1.58 Ptnml(0-2): 39, 8843, 26675, 9240, 44 closes https://github.com/official-stockfish/Stockfish/pull/4757 bench: 1574347 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: cj5716
Date: Tue Aug 22 11:22:15 2023 +0200 Timestamp: 1692696135 Do more full window searches Remove the value < beta condition for doing full window searches. As an added bonus the condition for full-window search is now much more similar to other fail-soft engines. Passed STC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 244608 W: 62286 L: 62294 D: 120028 Elo -0.01 Ptnml(0-2): 758, 28772, 63214, 28840, 720 https://tests.stockfishchess.org/tests/view/64d72d365b17f7c21c0e6675 Passed LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 311460 W: 78909 L: 78985 D: 153566 Elo -0.08 Ptnml(0-2): 129, 33959, 87656, 33831, 155 https://tests.stockfishchess.org/tests/view/64dca2265b17f7c21c0ee06c closes https://github.com/official-stockfish/Stockfish/pull/4755 Bench: 1624221 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: Gian-Carlo Pascutto
Date: Tue Aug 22 11:14:19 2023 +0200 Timestamp: 1692695659 Simplify Square Clipped ReLU code. Squared numbers are never negative, so barring any wraparound there is no need to clamp to 0. From reading the code, there's no obvious way to get wraparound, so the entire operation can be simplified away. Updated original truncated code comments to be sensible. Verified by running ./stockfish bench 128 1 24 and by the following test: STC: https://tests.stockfishchess.org/tests/view/64da4db95b17f7c21c0eabe7 LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 60224 W: 15425 L: 15236 D: 29563 Elo +1.09 Ptnml(0-2): 195, 6576, 16382, 6763, 196 closes https://github.com/official-stockfish/Stockfish/pull/4751 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: Stéphane Nicolet
Date: Tue Aug 22 10:59:39 2023 +0200 Timestamp: 1692694779 Fix some tabs in Makefile Avoid mixing spaces and tabs for indentation in Makefile closes https://github.com/official-stockfish/Stockfish/pull/4759 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: Joost VandeVondele
Date: Tue Aug 22 10:53:49 2023 +0200 Timestamp: 1692694429 Update links to fishtest Fishtest has moved to https://github.com/official-stockfish/fishtest/ closes https://github.com/official-stockfish/Stockfish/pull/4758 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: Matthies
Date: Tue Aug 22 10:43:51 2023 +0200 Timestamp: 1692693831 Allow compilation on Raspi (for ARMv8) Current master fails to compile for ARMv8 on Raspi cause gcc (version 10.2.1) does not like to cast between signed and unsigned vector types. This patch fixes it by using unsigned vector pointer for ARM to avoid implicite cast. closes https://github.com/official-stockfish/Stockfish/pull/4752 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: Stéphane Nicolet
Date: Tue Aug 22 10:39:03 2023 +0200 Timestamp: 1692693543 Fix some 'possible loss of data' warnings Patch by Maxim Masiutin closes https://github.com/official-stockfish/Stockfish/pull/4440 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: Disservin
Date: Wed Aug 16 21:25:42 2023 +0200 Timestamp: 1692213942 Add -funroll-loops to CXXFLAGS Optimize profiling data accuracy by enabling -funroll-loops during the profile generation phase, in addition to its default activation by -fprofile-use. This seems to produce a slightly faster binary, for most compilers. make -j profile-build ARCH=x86-64-avx2 sf_base = 1392875 +/- 5905 (95%) sf_test = 1402332 +/- 7303 (95%) diff = 9457 +/- 4413 (95%) speedup = 0.67896% +/- 0.317% (95%) STC: LLR: 2.93 (-2.94,2.94) <0.00,2.00> Total: 34784 W: 8970 L: 8665 D: 17149 Elo +3.05 Ptnml(0-2): 115, 3730, 9405, 4019, 123 https://tests.stockfishchess.org/tests/view/64d944815b17f7c21c0e92e1 closes https://github.com/official-stockfish/Stockfish/pull/4750 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: Muzhen Gaming
Date: Wed Aug 16 21:24:58 2023 +0200 Timestamp: 1692213898 Simplify PvNode Reduction Remove the depth condition for PvNode reduction. Simplification STC: https://tests.stockfishchess.org/tests/view/64d308fa5b17f7c21c0e0303 LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 38976 W: 10106 L: 9889 D: 18981 Elo +1.93 Ptnml(0-2): 129, 4479, 10040, 4726, 114 Simplification LTC: https://tests.stockfishchess.org/tests/view/64d457db5b17f7c21c0e236f LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 156402 W: 39727 L: 39645 D: 77030 Elo +0.18 Ptnml(0-2): 71, 17143, 43696, 17215, 76 closes https://github.com/official-stockfish/Stockfish/pull/4747 Bench: 1493904 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: SzilBalazs
Date: Wed Aug 16 21:24:58 2023 +0200 Timestamp: 1692213898 Fix dead link to compression algorithm in tbprobe closes https://github.com/official-stockfish/Stockfish/pull/4746 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: Disservin
Date: Wed Aug 16 21:24:54 2023 +0200 Timestamp: 1692213894 Add CONTRIBUTING.md closes https://github.com/official-stockfish/Stockfish/pull/4741 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: mstembera
Date: Sun Aug 13 11:59:06 2023 +0200 Timestamp: 1691920746 Simplify material difference in evaluate STC: https://tests.stockfishchess.org/tests/view/64d166235b17f7c21c0ddc15 LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 100032 W: 25698 L: 25547 D: 48787 Elo +0.52 Ptnml(0-2): 308, 11748, 25771, 11863, 326 LTC: https://tests.stockfishchess.org/tests/view/64d28c085b17f7c21c0df775 LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 123870 W: 31463 L: 31348 D: 61059 Elo +0.32 Ptnml(0-2): 63, 13487, 34719, 13604, 62 Besides rebasing I replaced PawnValueMg w/ 126 explicitly to decouple from https://tests.stockfishchess.org/tests/view/64d212de5b17f7c21c0debbb by @peregrineshahin which also passed. #4734 closes https://github.com/official-stockfish/Stockfish/pull/4731 Bench: 1447866 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: Shahin M. Shahin
Date: Sun Aug 13 11:58:08 2023 +0200 Timestamp: 1691920688 Simplify pieceValue to one phase. Simplifies the usage of pieceValues to mg values with the exception of pawnValues, After the removal of PSQT. passed STC: https://tests.stockfishchess.org/tests/view/64d147845b17f7c21c0dd86c LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 197248 W: 50168 L: 50125 D: 96955 Elo +0.08 Ptnml(0-2): 651, 23029, 51222, 23070, 652 passed LTC: https://tests.stockfishchess.org/tests/view/64d212de5b17f7c21c0debbb LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 181170 W: 45949 L: 45893 D: 89328 Elo +0.11 Ptnml(0-2): 84, 19656, 51052, 19706, 87 closes https://github.com/official-stockfish/Stockfish/pull/4734 Bench: 1494401 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: Stéphane Nicolet
Date: Sun Aug 13 11:52:47 2023 +0200 Timestamp: 1691920367 Simplify SEE pruning for captures It seems that the current search is smart enough to allow us to remove (again) the block of code that checks for discovered attacks after the first pruning condition for captures. STC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 278848 W: 70856 L: 70903 D: 137089 Elo -0.06 Ptnml(0-2): 960, 32829, 71894, 32780, 961 https://tests.stockfishchess.org/tests/view/64d0af095b17f7c21c0dc440 LTC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 100704 W: 25564 L: 25425 D: 49715 Elo +0.48 Ptnml(0-2): 56, 10858, 28381, 11005, 52 https://tests.stockfishchess.org/tests/view/64d293e85b17f7c21c0df844 closes https://github.com/official-stockfish/Stockfish/pull/4736 Bench: 1470572 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 13 11:48:32 2023 +0200 Timestamp: 1691920112 Simplify prior countermove bonus Swapping a multiplication operation between two terms with a simple constant Passed STC: LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 60512 W: 15424 L: 15231 D: 29857 Elo +1.11 Ptnml(0-2): 200, 6985, 15712, 7140, 219 https://tests.stockfishchess.org/tests/view/64d2addf5b17f7c21c0dfae6 Passed LTC: LLR: 2.96 (-2.94,2.94) <-1.75,0.25> Total: 108456 W: 27545 L: 27414 D: 53497 Elo +0.42 Ptnml(0-2): 63, 11629, 30698, 11790, 48 https://tests.stockfishchess.org/tests/view/64d3ab6e5b17f7c21c0e1188 closes https://github.com/official-stockfish/Stockfish/pull/4738 Bench: 1636213 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: ppigazzini
Date: Sun Aug 13 11:47:52 2023 +0200 Timestamp: 1691920072 Check compiler for docker builds in CI closes https://github.com/official-stockfish/Stockfish/pull/4739 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: Gabrik
Date: Sun Aug 13 11:46:48 2023 +0200 Timestamp: 1691920008 Remove the unused enum ScaleFactor closes https://github.com/official-stockfish/Stockfish/pull/4740 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: Shahin M. Shahin
Date: Sun Aug 13 11:44:17 2023 +0200 Timestamp: 1691919857 Detect repetitions before they happen in qsearch Passed STC: https://tests.stockfishchess.org/tests/view/64d495995b17f7c21c0e29ed LLR: 2.95 (-2.94,2.94) <0.00,2.00> Total: 340288 W: 86664 L: 85910 D: 167714 Elo +0.77 Ptnml(0-2): 1030, 38855, 89697, 39455, 1107 Passed LTC: https://tests.stockfishchess.org/tests/view/64d5e1085b17f7c21c0e4ab5 LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 193230 W: 49235 L: 48606 D: 95389 Elo +1.13 Ptnml(0-2): 98, 20432, 54921, 21071, 93 closes https://github.com/official-stockfish/Stockfish/pull/4742 Bench: 1579576 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: cj5716
Date: Sun Aug 13 11:40:35 2023 +0200 Timestamp: 1691919635 Simplify a depth condition As the negative extension term has sensitive scaling, it would make more sense to allow more negative extension also at lower depth, and not just a region between low and high depth. Passed STC: LLR: 2.96 (-2.94,2.94) <-1.75,0.25> Total: 124096 W: 31611 L: 31485 D: 61000 Elo +0.35 Ptnml(0-2): 422, 14437, 32205, 14561, 423 https://tests.stockfishchess.org/tests/view/64d205d75b17f7c21c0dea82 Passed LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 387882 W: 97840 L: 97993 D: 192049 Elo -0.14 Ptnml(0-2): 198, 42004, 109668, 41895, 176 https://tests.stockfishchess.org/tests/view/64d333f85b17f7c21c0e06c6 closes https://github.com/official-stockfish/Stockfish/pull/4743 Bench: 1542357 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: Sun Aug 13 11:38:24 2023 +0200 Timestamp: 1691919504 Give extra bonus to main history for moves that caused a fail low. #4744 Current master gives this type of bonuses to continuation history, this patch also gives them to main history. Passed STC: https://tests.stockfishchess.org/tests/view/64d4802a5b17f7c21c0e27b3 LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 480768 W: 122767 L: 121798 D: 236203 Elo +0.70 Ptnml(0-2): 1563, 56190, 123834, 57309, 1488 Passed LTC: https://tests.stockfishchess.org/tests/view/64d7e4c05b17f7c21c0e7456 LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 32052 W: 8329 L: 8022 D: 15701 Elo +3.33 Ptnml(0-2): 19, 3335, 9015, 3634, 23 closes https://github.com/official-stockfish/Stockfish/pull/4744 Bench: 1711793 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: Joost VandeVondele
Date: Sun Aug 13 11:34:00 2023 +0200 Timestamp: 1691919240 Update sanitizer CI to ubuntu 22.04 might fix the tsan errors closes https://github.com/official-stockfish/Stockfish/pull/4745 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: Joost VandeVondele
Date: Fri Aug 11 19:27:46 2023 +0200 Timestamp: 1691774866 Improve testing coverage, remove unused code a) Add further tests to CI to cover most features. This uncovered a potential race in case setoption was sent between two searches. As the UCI protocol requires this sent to be went the engine is not searching, setoption now ensures that this is the case. b) Remove some unused code closes https://github.com/official-stockfish/Stockfish/pull/4730 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: Tomasz Sobczyk
Date: Fri Aug 11 19:20:29 2023 +0200 Timestamp: 1691774429 Fix Makefile for incorrect nnue file If an incorrect network file is present at the start of the compilation stage, the Makefile script now correctly removes it before trying to download a clean version. closes https://github.com/official-stockfish/Stockfish/pull/4726 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: Cody Ho
Date: Wed Aug 9 18:27:16 2023 +0200 Timestamp: 1691598436 Remove all references to Score type Score is obsolete with the removal of psqt. No functional change. Signed-off-by: Cody Ho <> closes https://github.com/official-stockfish/Stockfish/pull/4724 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: Mon Aug 7 07:24:11 2023 +0200 Timestamp: 1691385851 Adjust futility pruning base in qsearch Current master used value from transposition table there if it existed, this patch uses minimum between this tt value and the static eval instead (this thus is closer to the main search function, which uses the static eval). Passed STC: https://tests.stockfishchess.org/tests/view/64cd57285b17f7c21c0d6a8c LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 252544 W: 64671 L: 64039 D: 123834 Elo +0.87 Ptnml(0-2): 839, 29207, 65575, 29785, 866 Passed LTC: https://tests.stockfishchess.org/tests/view/64cf6c915b17f7c21c0d9fcb LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 60150 W: 15374 L: 15012 D: 29764 Elo +2.09 Ptnml(0-2): 24, 6321, 17024, 6681, 25 closes https://github.com/official-stockfish/Stockfish/pull/4725 Bench: 1573024 see source |