| !! 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: Tue May 13 20:47:50 2025 +0200 Timestamp: 1747162070 Introducing a depth component to the penalty. Passed STC: LLR: 2.97 (-2.94,2.94) <0.00,2.00> Total: 31648 W: 8358 L: 8050 D: 15240 Elo +3.38 Ptnml(0-2): 78, 3596, 8182, 3876, 92 https://tests.stockfishchess.org/tests/view/680fa73d3629b02d74b165a9 Passed LTC: LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 177720 W: 45524 L: 44920 D: 87276 Elo +1.18 Ptnml(0-2): 91, 19130, 49813, 19736, 90 https://tests.stockfishchess.org/tests/view/68109e2c3629b02d74b166ee closes https://github.com/official-stockfish/Stockfish/pull/6060 Bench: 2251724 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: Shawn Xu
Date: Tue May 13 20:46:27 2025 +0200 Timestamp: 1747161987 Do more extensions in nodes far from the root Parameters found by @FauziAkram in the latest tune. Passed VVLTC w/ LTC Bound: LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 243264 W: 63452 L: 62774 D: 117038 Elo +0.97 Ptnml(0-2): 18, 22494, 75934, 23164, 22 https://tests.stockfishchess.org/tests/view/680e82b23629b02d74b15e27 Passed VVLTC w/ STC Bound: LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 37838 W: 9935 L: 9667 D: 18236 Elo +2.46 Ptnml(0-2): 6, 3383, 11873, 3651, 6 https://tests.stockfishchess.org/tests/view/681e707a3629b02d74b176e8 STC Elo Estimate: Elo: -0.49 ± 2.4 (95%) LOS: 34.8% Total: 20000 W: 5118 L: 5146 D: 9736 Elo -0.49 Ptnml(0-2): 55, 2365, 5182, 2349, 49 nElo: -0.96 ± 4.8 (95%) PairsRatio: 0.99 https://tests.stockfishchess.org/tests/view/6822af4b3629b02d74b17be6 closes https://github.com/official-stockfish/Stockfish/pull/6059 Bench: 2135382 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: Daniel Monroe
Date: Tue May 13 20:42:36 2025 +0200 Timestamp: 1747161756 Simplify futility pruning term Passed simplification STC LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 49920 W: 12933 L: 12727 D: 24260 Elo +1.43 Ptnml(0-2): 141, 5865, 12752, 6051, 151 https://tests.stockfishchess.org/tests/view/681d01d33629b02d74b1756e Passed simplification LTC LLR: 2.96 (-2.94,2.94) <-1.75,0.25> Total: 68808 W: 17573 L: 17402 D: 33833 Elo +0.86 Ptnml(0-2): 23, 7343, 19511, 7494, 33 https://tests.stockfishchess.org/tests/view/681e33843629b02d74b176b1 closes https://github.com/official-stockfish/Stockfish/pull/6058 Bench: 2041086 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 May 13 20:41:01 2025 +0200 Timestamp: 1747161661 Simplify probcut Passed STC: LLR: 2.97 (-2.94,2.94) <-1.75,0.25> Total: 80800 W: 20947 L: 20774 D: 39079 Elo +0.74 Ptnml(0-2): 217, 9446, 20906, 9609, 222 https://tests.stockfishchess.org/tests/view/680e83163629b02d74b15e2a Passed LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 359004 W: 91362 L: 91486 D: 176156 Elo -0.12 Ptnml(0-2): 177, 39133, 101007, 39007, 178 https://tests.stockfishchess.org/tests/view/680e95db3629b02d74b15e7a closes https://github.com/official-stockfish/Stockfish/pull/6054 Bench: 2060860 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: gab8192
Date: Tue May 13 20:40:26 2025 +0200 Timestamp: 1747161626 Simplify low-ply history weight Passed Non-regression STC: LLR: 2.97 (-2.94,2.94) <-1.75,0.25> Total: 116064 W: 30095 L: 29959 D: 56010 Elo +0.41 Ptnml(0-2): 333, 13753, 29731, 13875, 340 https://tests.stockfishchess.org/tests/view/681229f53629b02d74b168d3 Passed Non-regression LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 172824 W: 44096 L: 44031 D: 84697 Elo +0.13 Ptnml(0-2): 91, 18868, 48410, 18971, 72 https://tests.stockfishchess.org/tests/view/681474243629b02d74b16b44 closes https://github.com/official-stockfish/Stockfish/pull/6053 Bench: 2064179 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 May 13 20:39:23 2025 +0200 Timestamp: 1747161563 Remove a cutNode condition Allow some nodes to spawn even deeper lmr searches, also for cutNodes Passed STC: LLR: 2.96 (-2.94,2.94) <-1.75,0.25> Total: 59072 W: 15387 L: 15190 D: 28495 Elo +1.16 Ptnml(0-2): 145, 6956, 15166, 7095, 174 https://tests.stockfishchess.org/tests/view/6810b4c13629b02d74b16714 Passed LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 93294 W: 23737 L: 23591 D: 45966 Elo +0.54 Ptnml(0-2): 47, 10116, 26169, 10274, 41 https://tests.stockfishchess.org/tests/view/681170613629b02d74b167f3 closes https://github.com/official-stockfish/Stockfish/pull/6052 Bench: 1937565 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: mstembera
Date: Tue May 13 20:39:02 2025 +0200 Timestamp: 1747161542 Simplify Captures scoring STC https://tests.stockfishchess.org/tests/view/680ee3b43629b02d74b160f3 LLR: 2.96 (-2.94,2.94) <-1.75,0.25> Total: 200896 W: 52089 L: 52048 D: 96759 Elo +0.07 Ptnml(0-2): 592, 23821, 51589, 23846, 600 LTC https://tests.stockfishchess.org/tests/view/68106adf3629b02d74b166b1 LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 128856 W: 33026 L: 32917 D: 62913 Elo +0.29 Ptnml(0-2): 54, 13916, 36384, 14015, 59 Replaces discovered checks by direct checks which are simpler and more common. It's also what's used for scoring quiets. closes https://github.com/official-stockfish/Stockfish/pull/6047 Bench: 1886966 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 May 13 20:36:42 2025 +0200 Timestamp: 1747161402 Simplify ttCapture LMR Passed Non-regression STC: LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 51104 W: 13389 L: 13184 D: 24531 Elo +1.39 Ptnml(0-2): 182, 5940, 13068, 6215, 147 https://tests.stockfishchess.org/tests/view/680ef2503629b02d74b16498 Passed Non-regression LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 73350 W: 18804 L: 18638 D: 35908 Elo +0.79 Ptnml(0-2): 30, 7906, 20639, 8068, 32 https://tests.stockfishchess.org/tests/view/6810510e3629b02d74b1668a closes https://github.com/official-stockfish/Stockfish/pull/6044 Bench: 1805151 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: Tue May 13 20:34:40 2025 +0200 Timestamp: 1747161280 Simplify MovePicker::score() by using piece types for clarity STC https://tests.stockfishchess.org/tests/view/680ed6cc3629b02d74b160bf LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 200128 W: 51838 L: 51802 D: 96488 Elo +0.06 Ptnml(0-2): 457, 19956, 59247, 19902, 502 closes https://github.com/official-stockfish/Stockfish/pull/6039 No functional change 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: Michael Chaly
Date: Tue May 13 20:32:54 2025 +0200 Timestamp: 1747161174 Another scaling revert Revert recent passer because it seems to not scale for longer time controls. Adjust comments accordingly. Passed VVLTC SPRT with STC bounds: https://tests.stockfishchess.org/tests/view/680ddff73629b02d74b15b3f LLR: 2.95 (-2.94,2.94) <0.00,2.00> Total: 198316 W: 51317 L: 50846 D: 96153 Elo +0.83 Ptnml(0-2): 17, 18459, 61737, 18926, 19 Passed VVLTC SPRT with LTC bounds: https://tests.stockfishchess.org/tests/view/680d5b7e3629b02d74b15a21 LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 123274 W: 31738 L: 31283 D: 60253 Elo +1.28 Ptnml(0-2): 7, 11444, 38282, 11895, 9 closes https://github.com/official-stockfish/Stockfish/pull/6038 Bench: 2173845 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: Shawn Xu
Date: Tue May 13 20:31:37 2025 +0200 Timestamp: 1747161097 Remove risk tolerance Passed STC: LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 379328 W: 97567 L: 97724 D: 184037 Elo -0.14 Ptnml(0-2): 909, 44861, 98314, 44638, 942 https://tests.stockfishchess.org/tests/view/680defc63629b02d74b15b62 Passed LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 160752 W: 40762 L: 40685 D: 79305 Elo +0.17 Ptnml(0-2): 60, 17548, 45091, 17609, 68 https://tests.stockfishchess.org/tests/view/680e8ff43629b02d74b15e65 closes https://github.com/official-stockfish/Stockfish/pull/6037 Bench: 1897340 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: Carlos Esparza
Date: Tue May 13 20:30:22 2025 +0200 Timestamp: 1747161022 Simplify DirtyPiece Simplifies the DirtyPiece struct. passed STC: https://tests.stockfishchess.org/tests/view/68054c9798cd372e3aea05d7 LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 36608 W: 9641 L: 9437 D: 17530 Elo +1.94 Ptnml(0-2): 89, 3630, 10668, 3822, 95 passed LTC: https://tests.stockfishchess.org/tests/view/6805514598cd372e3aea0783 LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 127620 W: 31993 L: 31894 D: 63733 Elo +0.27 Ptnml(0-2): 42, 10983, 41665, 11074, 46 closes https://github.com/official-stockfish/Stockfish/pull/6016 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: Tue May 13 20:26:28 2025 +0200 Timestamp: 1747160788 Refactor futility_margin a small term to the futility calculation that depends on eval - beta. Passed STC: LLR: 2.95 (-2.94,2.94) <0.00,2.00> Total: 203136 W: 52797 L: 52239 D: 98100 Elo +0.95 Ptnml(0-2): 549, 23827, 52255, 24391, 546 https://tests.stockfishchess.org/tests/view/680e84a43629b02d74b15e2e Passed LTC: LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 100356 W: 25950 L: 25507 D: 48899 Elo +1.53 Ptnml(0-2): 35, 10683, 28302, 11120, 38 https://tests.stockfishchess.org/tests/view/680ebcb03629b02d74b16040 closes https://github.com/official-stockfish/Stockfish/pull/6009 closes https://github.com/official-stockfish/Stockfish/pull/6041 Bench: 1815939 Co-authored-by: Michael Chaly <> 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 Windows x64 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64 | Author: pb00067
Date: Tue May 13 20:23:43 2025 +0200 Timestamp: 1747160623 Preserve all moves in movepicker Simplifies method otherPieceTypesMobile quite a bit and makes it more precise. More precise because capturesSearched list not always contains all processed captures: although extremely rare, it can happen that a 'good' capture get pruned at step 14 and doesn't make it to capturesSearched. (functional change at higher depths) passed STC-simplification bounds https://tests.stockfishchess.org/tests/view/68025974cd501869c6698153 LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 273664 W: 15658 L: 15681 D: 242325 Elo -0.03 Ptnml(0-2): 166, 10368, 115802, 10315, 181 passed LTC-simplification bounds https://tests.stockfishchess.org/tests/view/6804b86acd501869c6698673 LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 96780 W: 24547 L: 24419 D: 47814 Elo +0.46 Ptnml(0-2): 30, 8466, 31286, 8562, 46 Applied changes requested by disservin & retested to be on the safe side STC: https://tests.stockfishchess.org/tests/view/6806110698cd372e3aea5919 LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 107392 W: 27739 L: 27606 D: 52047 Elo +0.43 Ptnml(0-2): 266, 10867, 31306, 10982, 275 LTC: https://tests.stockfishchess.org/tests/view/6806346198cd372e3aea5965 LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 233484 W: 59106 L: 59103 D: 115275 Elo +0.00 Ptnml(0-2): 116, 22787, 70939, 22778, 122 closes https://github.com/official-stockfish/Stockfish/pull/6005 Bench: 1857323 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 Apr 27 20:47:47 2025 +0200 Timestamp: 1745779667 VVLTC Tune Passed VVLTC with LTC bounds: LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 12800 W: 3432 L: 3184 D: 6184 Elo +6.73 Ptnml(0-2): 1, 1098, 3954, 1346, 1 https://tests.stockfishchess.org/tests/view/680e255e3629b02d74b15d5e Passed VVLTC with STC bounds: LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 14402 W: 3865 L: 3625 D: 6912 Elo +5.79 Ptnml(0-2): 0, 1236, 4490, 1474, 1 https://tests.stockfishchess.org/tests/view/680e4dfb3629b02d74b15da6 Passed VVLTC third test (removing an unrelated change): LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 25584 W: 6670 L: 6398 D: 12516 Elo +3.69 Ptnml(0-2): 4, 2290, 7932, 2562, 4 https://tests.stockfishchess.org/tests/view/680e74223629b02d74b15def closes https://github.com/official-stockfish/Stockfish/pull/6036 Bench: 1857323 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: Daniel Monroe
Date: Sun Apr 27 20:31:40 2025 +0200 Timestamp: 1745778700 Simplify second probcut to linear function of depth Passed non-regression STC LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 57472 W: 14962 L: 14765 D: 27745 Elo +1.19 Ptnml(0-2): 140, 6715, 14817, 6936, 128 https://tests.stockfishchess.org/tests/view/680df1063629b02d74b15b69 Passed non-regression LTC LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 88416 W: 22499 L: 22348 D: 43569 Elo +0.59 Ptnml(0-2): 31, 9565, 24874, 9698, 40 https://tests.stockfishchess.org/tests/view/680df3a93629b02d74b15b7d closes https://github.com/official-stockfish/Stockfish/pull/6035 Bench: 1792000 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 Apr 27 20:28:22 2025 +0200 Timestamp: 1745778502 Do more pruning in moves loop Effectively reverts one commit from some months ago. Passed VVLTC SPRT with STC bounds https://tests.stockfishchess.org/tests/view/680d39373629b02d74b156d7 LLR: 2.95 (-2.94,2.94) <0.00,2.00> Total: 405058 W: 104843 L: 104111 D: 196104 Elo +0.63 Ptnml(0-2): 35, 38029, 125672, 38755, 38 Passed VVLTC SPRT with LTC bounds https://tests.stockfishchess.org/tests/view/680d1a3b3629b02d74b1563d LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 57032 W: 14917 L: 14588 D: 27527 Elo +2.00 Ptnml(0-2): 6, 5202, 17768, 5537, 3 closes https://github.com/official-stockfish/Stockfish/pull/6031 Bench: 1643819 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: FauziAkram
Date: Sun Apr 27 20:14:38 2025 +0200 Timestamp: 1745777678 Tweak History Bonus Inspired by @Ergodice , who came up first with the idea. Passed STC: LLR: 2.96 (-2.94,2.94) <0.00,2.00> Total: 18400 W: 4867 L: 4576 D: 8957 Elo +5.50 Ptnml(0-2): 52, 2052, 4714, 2317, 65 https://tests.stockfishchess.org/tests/view/68062a3c98cd372e3aea5959 Passed LTC: LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 454338 W: 116461 L: 115294 D: 222583 Elo +0.89 Ptnml(0-2): 198, 49139, 127346, 50270, 216 https://tests.stockfishchess.org/tests/view/6806347c98cd372e3aea5967 Passed VLTC non-reg: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 385970 W: 98401 L: 98546 D: 189023 Elo -0.13 Ptnml(0-2): 51, 38958, 115105, 38827, 44 https://tests.stockfishchess.org/tests/view/680cfe873629b02d74b155cf closes https://github.com/official-stockfish/Stockfish/pull/6030 Bench: 1715817 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: FauziAkram
Date: Sun Apr 27 19:47:08 2025 +0200 Timestamp: 1745776028 Simplify Evasion Move Scoring Passed STC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 160256 W: 41432 L: 41348 D: 77476 Elo +0.18 Ptnml(0-2): 485, 19034, 41028, 19074, 507 https://tests.stockfishchess.org/tests/view/680d242c3629b02d74b15662 Passed LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 103086 W: 26388 L: 26252 D: 50446 Elo +0.46 Ptnml(0-2): 41, 11174, 28982, 11300, 46 https://tests.stockfishchess.org/tests/view/680d47f83629b02d74b1571e closes https://github.com/official-stockfish/Stockfish/pull/6029 Bench: 1937261 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: FauziAkram
Date: Sun Apr 27 19:45:37 2025 +0200 Timestamp: 1745775937 Improve quiet moves bonus Inspired by an old test by Peregrine. Passed STC: LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 453024 W: 117244 L: 116316 D: 219464 Elo +0.71 Ptnml(0-2): 1336, 53355, 116258, 54171, 1392 https://tests.stockfishchess.org/tests/view/680ccacc3629b02d74b15532 Passed LTC: LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 140550 W: 35990 L: 35462 D: 69098 Elo +1.31 Ptnml(0-2): 65, 15152, 39319, 15668, 71 https://tests.stockfishchess.org/tests/view/680d2ed73629b02d74b15691 closes https://github.com/official-stockfish/Stockfish/pull/6028 Bench: 1708152 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: Myself
Date: Sun Apr 27 19:45:00 2025 +0200 Timestamp: 1745775900 Replace complex probcut function with a precomputed table. Passed non-regression STC: https://tests.stockfishchess.org/tests/view/680de2683629b02d74b15b46 LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 116000 W: 29864 L: 29742 D: 56394 Elo +0.37 Ptnml(0-2): 215, 11811, 33854, 11877, 243 closes https://github.com/official-stockfish/Stockfish/pull/6026 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: Shawn Xu
Date: Sun Apr 27 19:43:47 2025 +0200 Timestamp: 1745775827 Simplify malus calculation closes https://github.com/official-stockfish/Stockfish/pull/6024 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: Carlos Esparza
Date: Sun Apr 27 19:42:06 2025 +0200 Timestamp: 1745775726 Simplify move ordering bonuses for putting piece en prise and escaping capture Now there is also a penalty for exposing knights and bishops to capture by a pawn. Passed STC: https://tests.stockfishchess.org/tests/view/68074379878abf56f9a0d5b1 LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 96512 W: 24841 L: 24687 D: 46984 Elo +0.55 Ptnml(0-2): 294, 11336, 24835, 11504, 287 Passed LTC: https://tests.stockfishchess.org/tests/view/6808954a878abf56f9a0d76d LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 221328 W: 56271 L: 56255 D: 108802 Elo +0.03 Ptnml(0-2): 131, 24149, 62071, 24199, 114 closes https://github.com/official-stockfish/Stockfish/pull/6023 Bench: 1778227 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: Carlos Esparza
Date: Sun Apr 27 19:27:18 2025 +0200 Timestamp: 1745774838 Introduce double incremental accumulator updates when we need to update an accumulator by two moves and the second move captures the piece moved in the first move, we can skip computing the middle accumulator and cancel a feature add with a feature remove to save work. Passed STC https://tests.stockfishchess.org/tests/view/67f70b1c31d7cf8afdc45f51 LLR: 2.93 (-2.94,2.94) <0.00,2.00> Total: 72800 W: 18878 L: 18529 D: 35393 Elo +1.67 Ptnml(0-2): 160, 7711, 20374, 7930, 225 closes https://github.com/official-stockfish/Stockfish/pull/5988 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: Shawn Xu
Date: Sun Apr 27 19:26:02 2025 +0200 Timestamp: 1745774762 Clean up search * Correct IIR scaling comments * Replace `(PvNode || cutNode)` with `!allNode` * Consistent formatting for scaler tags * Add comments to some recently-introduced LMR terms * Add comments on PCM bonus tweaks Passed Non-regression STC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 389472 W: 102457 L: 102622 D: 184393 Elo -0.15 Ptnml(0-2): 1676, 41887, 107798, 41676, 1699 https://tests.stockfishchess.org/tests/view/67a0ea670774dfd78deb23cd closes https://github.com/official-stockfish/Stockfish/pull/5854 Bench: 1585741 see source |