| 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 |
| 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 6 22:25:58 2023 +0200 Timestamp: 1691353558 Tweak formula for pruning moves losing material Simplify the "Prune moves with negative SEE" formula, by removing one multiplication and subtraction operation. Passed STC: LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 214272 W: 54596 L: 54572 D: 105104 Elo +0.04 Ptnml(0-2): 741, 25160, 55320, 25164, 751 https://tests.stockfishchess.org/tests/view/64c430d1dc56e1650abbdbf6 Passed LTC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 238380 W: 60600 L: 60601 D: 117179 Elo -0.00 Ptnml(0-2): 132, 26069, 66791, 26064, 134 https://tests.stockfishchess.org/tests/view/64c81f155b17f7c21c0cee2b closes https://github.com/official-stockfish/Stockfish/pull/4721 bench: 1655337 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: Linmiao Xu
Date: Sun Aug 6 22:16:52 2023 +0200 Timestamp: 1691353012 Remove classical psqt Based on vondele's deletepsqt branch: https://github.com/vondele/Stockfish/commit/369f5b051 This huge simplification uses a weighted material differences instead of the positional piece square tables (psqt) in the semi-classical complexity calculation. Tuned weights using spsa at 45+0.45 with: int pawnMult = 100; int knightMult = 325; int bishopMult = 350; int rookMult = 500; int queenMult = 900; TUNE(SetRange(0, 200), pawnMult); TUNE(SetRange(0, 650), knightMult); TUNE(SetRange(0, 700), bishopMult); TUNE(SetRange(200, 800), rookMult); TUNE(SetRange(600, 1200), queenMult); The values obtained via this tuning session were for a model where the psqt replacement formula was always from the point of view of White, even if the side to move was Black. We re-used the same values for an implementation with a psqt replacement from the point of view of the side to move, testing the result both on our standard book on positions with a strong White bias, and an alternate book with positions with a strong Black bias. We note that with the patch the last use of the venerable "Score" type disappears in Stockfish codebase (the Score type was used in classical evaluation to get a tampered eval interpolating values smoothly from the early midgame stage to the endgame stage). We leave it to another commit to clean all occurrences of Score in the code and the comments. ------- Passed non-regression LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 142542 W: 36264 L: 36168 D: 70110 Elo +0.23 Ptnml(0-2): 76, 15578, 39856, 15696, 65 https://tests.stockfishchess.org/tests/view/64c8cb495b17f7c21c0cf9f8 Passed non-regression LTC (with a book with Black bias): https://tests.stockfishchess.org/tests/view/64c8f9295b17f7c21c0cfdaf LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 494814 W: 125565 L: 125827 D: 243422 Elo -0.18 Ptnml(0-2): 244, 53926, 139346, 53630, 261 ------ closes https://github.com/official-stockfish/Stockfish/pull/4713 Bench: 1655985 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: AndrovT
Date: Sun Aug 6 21:22:37 2023 +0200 Timestamp: 1691349757 Implement AffineTransformSparseInput for armv8 Implements AffineTransformSparseInput layer for the NNUE evaluation for the armv8 and armv8-dotprod architectures. We measured some nice speed improvements via 10 runs of our benchmark: armv8, Cortex-X1 : 18.5% speed-up armv8, Cortex-A76 : 13.2% speed-up armv8-dotprod, Cortex-X1 : 27.1% speed-up armv8-dotprod, Cortex-A76 : 12.1% speed-up armv8, Cortex-A72, Raspberry Pi 4 : 8.2% speed-up (thanks Torom!) closes https://github.com/official-stockfish/Stockfish/pull/4719 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: ppigazzini
Date: Sun Aug 6 21:17:33 2023 +0200 Timestamp: 1691349453 Add new CPU archs in CI Tests workflow Add CPU archs: armv8-dotprod, riscv64 and ppc64le. The last two archs are built using QEMU multiarch docker container. References: https://docs.docker.com/build/building/multi-platform/ https://github.com/docker/setup-buildx-action https://github.com/docker/setup-qemu-action https://github.com/tonistiigi/binfmt https://stackoverflow.com/questions/72444103/what-does-running-the-multiarch-qemu-user-static-does-before-building-a-containe closes https://github.com/official-stockfish/Stockfish/pull/4718 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: Niklas Fiekas
Date: Sun Aug 6 21:14:39 2023 +0200 Timestamp: 1691349279 Identify NEON_DOTPROD in compiler_info() closes https://github.com/official-stockfish/Stockfish/pull/4712 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: rn5f107s2
Date: Sat Jul 29 00:56:26 2023 +0200 Timestamp: 1690584986 Malus during move ordering for putting pieces en prise The original idea is the reverse of a previous patch [1] which added bonuses in our move picker to moves escaping threats. In this patch, in addition to bonuses for evading threats, we apply penalties to moves moving to threatened squares. Further tweaks of that basic idea resulted in this specific version which further increases the penalty of moves moving to squares threatend depending on the piece threatening it. So for example a queen moving to a square attacked by a pawn would receive a larger penalty than a queen moving to square attacked by a rook. [1]: https://github.com/official-stockfish/Stockfish/commit/08e0f52b77edb929989c68c49e954b9bc5d7d67e -------- Passed STC: https://tests.stockfishchess.org/tests/live_elo/64c11269dc56e1650abb935d LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 95552 W: 24654 L: 24250 D: 46648 Elo +1.47 Ptnml(0-2): 322, 11098, 24562, 11442, 352 Passed LTC: https://tests.stockfishchess.org/tests/live_elo/64c2004ddc56e1650abba8b3 LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 190230 W: 48806 L: 48178 D: 93246 Elo +1.15 Ptnml(0-2): 90, 20439, 53453, 21019, 114 ------- closes https://github.com/official-stockfish/Stockfish/pull/4711 Bench: 1350831 see source |