| 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: Mon Nov 20 18:59:01 2023 +0100 Timestamp: 1700503141 Change depth - 1 to newDepth Replacing 'depth - 1' with 'newDepth' in the singularbeta formula utilizes existing variables more succinctly. closes https://github.com/official-stockfish/Stockfish/pull/4876 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: Stefan Geschwentner
Date: Thu Nov 16 09:10:20 2023 +0100 Timestamp: 1700122220 Fix undefined behavior in search. We use following line to clamp the search depth in some range: Depth d = std::clamp(newDepth - r, 1, newDepth + 1); Through negative extension its possible that the maximum value becomes smaller than the minimum value but then the behavior is undefined (see https://en.cppreference.com/w/cpp/algorithm/clamp). So replace this line with a safe implementation. Remark: We have in recent master already one line where up to 3 negative extensions are possible which could trigger this undefined behavior but this can only be happen for completed depth > 24 so its not discovered by our default bench. Recent negative extension tests by @fauzi shows then this undefined behavior with wrong bench numbers. closes https://github.com/official-stockfish/Stockfish/pull/4877 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: Thu Nov 16 09:01:57 2023 +0100 Timestamp: 1700121717 CI updates - updates the SDE action to v2.2 - removes the linux x86-32 builds, which were almost unused, and the build process under SDE started failing recently, possibly related to glibc update (The futex facility returned an unexpected error code.) closes https://github.com/official-stockfish/Stockfish/pull/4875 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: Wed Nov 15 19:35:14 2023 +0100 Timestamp: 1700073314 Symmetrize optimism Removes some additional parameters, making the term more logical at the same time. Passed STC: https://tests.stockfishchess.org/tests/view/6550e896136acbc5735328ed LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 271104 W: 68441 L: 68480 D: 134183 Elo -0.05 Ptnml(0-2): 827, 32590, 68816, 32433, 886 Passed LTC: https://tests.stockfishchess.org/tests/view/65523858136acbc5735344f7 LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 198954 W: 49250 L: 49211 D: 100493 Elo +0.07 Ptnml(0-2): 93, 22565, 54117, 22614, 88 closes https://github.com/official-stockfish/Stockfish/pull/4874 Bench: 1334248 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: Taras Vuk
Date: Wed Nov 15 19:32:59 2023 +0100 Timestamp: 1700073179 Introduce recapture extensions When in a PV-node this patch extends ttMove if it is a recapture and has a good history. Passed STC: LLR: 2.95 (-2.94,2.94) <0.00,2.00> Total: 83840 W: 21560 L: 21166 D: 41114 Elo +1.63 Ptnml(0-2): 343, 9905, 21027, 10305, 340 https://tests.stockfishchess.org/tests/view/654f4b02136acbc5735308ab Passed LTC: LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 165318 W: 41068 L: 40476 D: 83774 Elo +1.24 Ptnml(0-2): 98, 18670, 44517, 19290, 84 https://tests.stockfishchess.org/tests/view/654fde04136acbc5735314e0 closes https://github.com/official-stockfish/Stockfish/pull/4872 Bench: 1393911 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: Sat Nov 11 15:26:56 2023 +0100 Timestamp: 1699712816 Simplify away optimism average score offset params Passed non-regression STC: https://tests.stockfishchess.org/tests/view/654abf6b136acbc57352ac4b LLR: 2.97 (-2.94,2.94) <-1.75,0.25> Total: 49664 W: 12687 L: 12477 D: 24500 Elo +1.47 Ptnml(0-2): 138, 5840, 12703, 5976, 175 Passed non-regression LTC: https://tests.stockfishchess.org/tests/view/654b638e136acbc57352b961 LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 347166 W: 85561 L: 85676 D: 175929 Elo -0.12 Ptnml(0-2): 206, 39569, 94150, 39450, 208 closes https://github.com/official-stockfish/Stockfish/pull/4871 bench 1257641 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: Tue Nov 7 08:28:43 2023 +0100 Timestamp: 1699342123 Double weight of pawn history for quiet move ordering. I measured on my 1000 position bench the average additional added pawn history per depth. This shows on average negative value with even smaller values with increaing depth. A linear regression against depth get following formula: -1960 - 130 * depth For compensation add this to the used sort limit to maintain roughly the same proportion of sorted quiet moves. Remarks: 1. using no compensation failed here https://tests.stockfishchess.org/tests/view/6547664f136acbc5735265f0 2. using only the compensation failed at LTC: passed STC: https://tests.stockfishchess.org/tests/view/65477457136acbc5735266f8 failed LTC: https://tests.stockfishchess.org/tests/view/65487fc8136acbc573527d1c STC: LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 98528 W: 25109 L: 24699 D: 48720 Elo +1.45 Ptnml(0-2): 334, 11586, 25009, 12006, 329 https://tests.stockfishchess.org/tests/view/65475873136acbc5735264f7 LTC: LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 69726 W: 17467 L: 17073 D: 35186 Elo +1.96 Ptnml(0-2): 39, 7814, 18769, 8196, 45 https://tests.stockfishchess.org/tests/view/6547e759136acbc573527071 closes https://github.com/official-stockfish/Stockfish/pull/4866 Bench: 1379422 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: Taras Vuk
Date: Tue Nov 7 08:23:11 2023 +0100 Timestamp: 1699341791 Remove pawn history from ProbCut constructor use same style as other history tables Passed STC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 184672 W: 46953 L: 46896 D: 90823 Elo +0.11 Ptnml(0-2): 604, 21095, 48887, 21140, 610 https://tests.stockfishchess.org/tests/view/654766b4136acbc573526602 closes https://github.com/official-stockfish/Stockfish/pull/4865 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: Taras Vuk
Date: Sun Nov 5 19:54:59 2023 +0100 Timestamp: 1699210499 Use stat_malus when decreasing stats This patch applies stat_bonus when increasing and stat_malus when decreasing stats. Passed STC: LLR: 2.93 (-2.94,2.94) <0.00,2.00> Total: 133792 W: 34221 L: 33758 D: 65813 Elo +1.20 Ptnml(0-2): 477, 15764, 33959, 16211, 485 https://tests.stockfishchess.org/tests/view/654699f3136acbc5735256b2 Passed LTC: LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 67374 W: 16912 L: 16523 D: 33939 Elo +2.01 Ptnml(0-2): 42, 7528, 18171, 7891, 55 https://tests.stockfishchess.org/tests/view/65474558136acbc5735263ab closes https://github.com/official-stockfish/Stockfish/pull/4864 bench: 1114417 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 Nov 5 19:53:15 2023 +0100 Timestamp: 1699210395 Set reduction to 0 if the move is a TT move The reduction formula currently decreases by 1 if the move is a TT move. This changes this by just setting the reduction to 0 instead. Passed STC: LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 83136 W: 21145 L: 20758 D: 41233 Elo +1.62 Ptnml(0-2): 279, 9772, 21090, 10137, 290 https://tests.stockfishchess.org/tests/view/653c0fbacc309ae839561584 Passed LTC: LLR: 2.96 (-2.94,2.94) <0.50,2.50> Total: 273150 W: 67987 L: 67171 D: 137992 Elo +1.04 Ptnml(0-2): 155, 30730, 73966, 31592, 132 https://tests.stockfishchess.org/tests/view/653d9d02cc309ae839562fdf closes https://github.com/official-stockfish/Stockfish/pull/4863 bench: 1110556 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 Nov 5 19:51:02 2023 +0100 Timestamp: 1699210262 Enhance some comments This documents some code and makes some hard code easier to understand for new developers. closes https://github.com/official-stockfish/Stockfish/pull/4862 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: Sat Nov 4 17:34:35 2023 +0100 Timestamp: 1699115675 Tweaking the futility pruning formula Huge credit goes also to candirufish, as the idea was first tried by him, and then tuned by me at multiple phases. Tweaking the futility pruning formula to be a bit more selective about when pruning is applied. Adjust the value added to the static eval based on the bestValue relative to ss->staticEval. If bestValue is significantly lower, we add a larger value. Passed STC: LLR: 2.98 (-2.94,2.94) <0.00,2.00> Total: 37120 W: 9590 L: 9266 D: 18264 Elo +3.03 Ptnml(0-2): 130, 4301, 9385, 4603, 141 https://tests.stockfishchess.org/tests/view/6544cf90136acbc573523247 Passed LTC: LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 49632 W: 12381 L: 12033 D: 25218 Elo +2.44 Ptnml(0-2): 30, 5429, 13549, 5779, 29 https://tests.stockfishchess.org/tests/view/65453bc1136acbc573523a3c closes https://github.com/official-stockfish/Stockfish/pull/4861 bench: 1107118 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: Fri Nov 3 22:50:05 2023 +0100 Timestamp: 1699048205 Update pawn history based on static eval difference Use the same logic as in main history but with 1/4 multiplier. Passed STC: https://tests.stockfishchess.org/tests/view/653c1282cc309ae8395615bf LLR: 2.93 (-2.94,2.94) <0.00,2.00> Total: 306624 W: 77811 L: 77094 D: 151719 Elo +0.81 Ptnml(0-2): 975, 36411, 77830, 37114, 982 Passed LTC: https://tests.stockfishchess.org/tests/view/654258e2cc309ae83956818d LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 99150 W: 24681 L: 24228 D: 50241 Elo +1.59 Ptnml(0-2): 56, 11107, 26792, 11568, 52 closes https://github.com/official-stockfish/Stockfish/pull/4859 bench 1330590 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: Fri Nov 3 22:47:31 2023 +0100 Timestamp: 1699048051 Remove razoring history update. The recently commit 'Rewarding Quiet Moves that Enable Razoring' add a history update if razoring. But its contains also many tuned values all over the search. Following tests shows that the tuned values and not the added history update is responsible for the elo gain. So remove later. Passed STC: LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 29376 W: 7641 L: 7410 D: 14325 Elo +2.73 Ptnml(0-2): 100, 3411, 7451, 3610, 116 https://tests.stockfishchess.org/tests/view/653c9fe1cc309ae839562070 Passed LTC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 242922 W: 59879 L: 59885 D: 123158 Elo -0.01 Ptnml(0-2): 129, 27764, 65688, 27744, 136 https://tests.stockfishchess.org/tests/view/653d06cbcc309ae839562735 closes https://github.com/official-stockfish/Stockfish/pull/4858 Bench: 1286104 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: Fri Nov 3 22:40:43 2023 +0100 Timestamp: 1699047643 Simplifying two formulas by eliminating two multiplication operations. Passed STC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 60000 W: 15193 L: 14996 D: 29811 Elo +1.14 Ptnml(0-2): 199, 7100, 15215, 7277, 209 https://tests.stockfishchess.org/tests/view/653beb69cc309ae83956129d Passed LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 122910 W: 30471 L: 30353 D: 62086 Elo +0.33 Ptnml(0-2): 68, 13961, 33271, 14095, 60 https://tests.stockfishchess.org/tests/view/653c5848cc309ae839561ae7 closes https://github.com/official-stockfish/Stockfish/pull/4857 bench: 1216779 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: Fri Nov 3 22:39:04 2023 +0100 Timestamp: 1699047544 Prefetch TT entries in probcut Passed STC: LLR: 2.93 (-2.94,2.94) <0.00,2.00> Total: 101344 W: 25893 L: 25491 D: 49960 Elo +1.38 Ptnml(0-2): 303, 11350, 26991, 11698, 330 https://tests.stockfishchess.org/tests/view/6540daa6cc309ae83956669b slight speedup: ``` Result of 100 runs ================== base (./stockfish.master ) = 1170705 +/- 3133 test (./stockfish.patch ) = 1174545 +/- 2895 diff = +3841 +/- 3196 speedup = +0.0033 P(speedup > 0) = 0.9907 ``` closes https://github.com/official-stockfish/Stockfish/pull/4856 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: Mon Oct 30 07:51:27 2023 +0100 Timestamp: 1698648687 Introduce asymmetric optimism Introduce asymmetric optimism for both side to move and opponent. Parameter tuning was done with 200k LTC games. STC: https://tests.stockfishchess.org/tests/view/653cc08fcc309ae8395622b3 LLR: 2.96 (-2.94,2.94) <0.00,2.00> Total: 98336 W: 25074 L: 24661 D: 48601 Elo +1.46 Ptnml(0-2): 339, 11612, 24890, 11951, 376 LTC: https://tests.stockfishchess.org/tests/view/653db595cc309ae839563140 LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 83244 W: 20760 L: 20339 D: 42145 Elo +1.76 Ptnml(0-2): 51, 9306, 22498, 9705, 62 closes https://github.com/official-stockfish/Stockfish/pull/4853 Bench: 1371690 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: Mon Oct 30 07:49:15 2023 +0100 Timestamp: 1698648555 Small cleanups Corrects some incorrect or outdated comments. Credit is shared with yaneurao (see 38e830a#commitcomment-131131500) and locutus2 closes #4852 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: Fri Oct 27 18:35:52 2023 +0200 Timestamp: 1698424552 remove outdated comment Bench: 1258079 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: Fri Oct 27 17:33:59 2023 +0200 Timestamp: 1698420839 Format Code 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: Fri Oct 27 17:32:19 2023 +0200 Timestamp: 1698420739 Rewarding Quiet Moves that Enable Razoring The main idea of the patch comes from @peregrineshahin : https://tests.stockfishchess.org/tests/view/65205363ac57711436728781 Another small idea (tuning) comes from @Vizvezdenec https://tests.stockfishchess.org/tests/view/652e071ade6d262d08d318f4 And a long phases of tuning and tests was done by me in order to make the patch be able to pass both tests. The idea, as mentioned by Peregrine is that in our standard code, if no best move found after searching all moves, we give a bonus to the previous move that caused the fail high. So in razoring we assume no bestmove will be found so we might as well do the same. Passed STC: LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 82336 W: 20997 L: 20610 D: 40729 Elo +1.63 Ptnml(0-2): 288, 9710, 20753, 10161, 256 https://tests.stockfishchess.org/tests/view/6538fafbcc309ae83955d8f0 Passed LTC: LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 46584 W: 11753 L: 11411 D: 23420 Elo +2.55 Ptnml(0-2): 21, 5133, 12642, 5475, 21 https://tests.stockfishchess.org/tests/view/653a3f2ccc309ae83955f223 closes https://github.com/official-stockfish/Stockfish/pull/4850 Bench: 1258079 Co-Authored-By: Shahin M. Shahin <41402573+> 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: Fri Oct 27 17:24:25 2023 +0200 Timestamp: 1698420265 Introduce pawn structure based history Original idea by Seer chess engine https://github.com/connormcmonigle/seer-nnue, coding done by @Disservin, code refactoring done by @locutus2 to match the style of other histories. This patch introduces pawn structure based history, which assings moves values based on last digits of pawn structure hash and piece type of moved piece and landing square of the move. Idea is that good places for pieces are quite often determined by pawn structure of position. Used in 3 different places - sorting of quiet moves, sorting of quiet check evasions and in history based pruning in search. Passed STC: https://tests.stockfishchess.org/tests/view/65391d08cc309ae83955dbaf LLR: 2.95 (-2.94,2.94) <0.00,2.00> Total: 155488 W: 39408 L: 38913 D: 77167 Elo +1.11 Ptnml(0-2): 500, 18427, 39408, 18896, 513 Passed LTC: https://tests.stockfishchess.org/tests/view/653a36a2cc309ae83955f181 LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 70110 W: 17548 L: 17155 D: 35407 Elo +1.95 Ptnml(0-2): 33, 7859, 18889, 8230, 44 closes https://github.com/official-stockfish/Stockfish/pull/4849 Bench: 1257882 Co-Authored-By: Disservin <> Co-Authored-By: Stefan Geschwentner <> 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: Taras Vuk
Date: Fri Oct 27 17:16:28 2023 +0200 Timestamp: 1698419788 Simplify futility pruning formula closes https://github.com/official-stockfish/Stockfish/pull/4848 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: Linmiao Xu
Date: Tue Oct 24 17:46:18 2023 +0200 Timestamp: 1698162378 Update 5 search params for pruning at shallow depth Found by spsa tuning at 45+0.45 with: ``` int fpcEvalOffset = 188; int fpcLmrDepthMult = 206; int histDepthMult = -3232; int histDenom = 5793; int fpEvalOffset = 115; int negSeeDepthMultSq = -27; TUNE(SetRange(0, 394), fpcEvalOffset); TUNE(SetRange(0, 412), fpcLmrDepthMult); TUNE(SetRange(-6464, -1616), histDepthMult); TUNE(SetRange(2896, 11586), histDenom); TUNE(SetRange(0, 230), fpEvalOffset); TUNE(SetRange(-54, 0), negSeeDepthMultSq); ``` Passed STC: https://tests.stockfishchess.org/tests/view/6535551de746e058e6c0165d LLR: 2.98 (-2.94,2.94) <0.00,2.00> Total: 109056 W: 28025 L: 27599 D: 53432 Elo +1.36 Ptnml(0-2): 357, 12669, 28038, 13119, 345 Passed LTC: https://tests.stockfishchess.org/tests/view/65364c6ff127f3553505175d LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 61290 W: 15316 L: 14941 D: 31033 Elo +2.13 Ptnml(0-2): 34, 6849, 16498, 7236, 28 closes https://github.com/official-stockfish/Stockfish/pull/4847 bench 1167412 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 Oct 24 17:43:05 2023 +0200 Timestamp: 1698162185 Cleanup comments and some code reorg. passed STC: https://tests.stockfishchess.org/tests/view/6536dc7dcc309ae83955b04d LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 58048 W: 14693 L: 14501 D: 28854 Elo +1.15 Ptnml(0-2): 200, 6399, 15595, 6669, 161 closes https://github.com/official-stockfish/Stockfish/pull/4846 No functional change see source |