| 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: Dubslow
Date: Sat Feb 18 14:01:08 2023 +0100 Timestamp: 1676725268 Remove one `reduction` call even though bench is unchanged to depth 28, due to adjusting depth in singular extensions this might be functional. STC: https://tests.stockfishchess.org/tests/view/63ec21affe833123fef34153 LLR: 2.96 (-2.94,2.94) <-1.75,0.25> Total: 195712 W: 51625 L: 51581 D: 92506 Elo +0.08 Ptnml(0-2): 504, 20527, 55779, 20513, 533 LTC: https://tests.stockfishchess.org/tests/view/63ed3487fe833123fef375ed LLR: 2.96 (-2.94,2.94) <-1.75,0.25> Total: 32176 W: 8631 L: 8442 D: 15103 Elo +2.04 Ptnml(0-2): 5, 2794, 10309, 2967, 13 closes https://github.com/official-stockfish/Stockfish/pull/4395 Bench 4283297 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: Dubslow
Date: Sat Feb 18 13:34:40 2023 +0100 Timestamp: 1676723680 Simplify late countermove bonus condition STC: https://tests.stockfishchess.org/tests/view/63d53ac6a67dd929a555e1e2 LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 216096 W: 56862 L: 56839 D: 102395 Elo +0.04 Ptnml(0-2): 648, 24033, 58650, 24082, 635 LTC: https://tests.stockfishchess.org/tests/view/63d7f9a6a67dd929a5565991 LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 808512 W: 214060 L: 214610 D: 379842 Elo -0.24 Ptnml(0-2): 301, 79448, 245293, 78928, 286 closes https://github.com/official-stockfish/Stockfish/pull/4392 Bench: 4283297 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: Sat Feb 18 13:30:48 2023 +0100 Timestamp: 1676723448 Simplify nnueComplexity calculation. further simplification after https://github.com/official-stockfish/Stockfish/pull/4377 STC https://tests.stockfishchess.org/tests/view/63e02a3773223e7f52ad8190 LLR: 2.97 (-2.94,2.94) <-1.75,0.25> Total: 359072 W: 94605 L: 94733 D: 169734 Elo -0.12 Ptnml(0-2): 994, 39874, 97958, 39686, 1024 LTC https://tests.stockfishchess.org/tests/view/63e3fd12b5f425d71f77002a LLR: 2.96 (-2.94,2.94) <-1.75,0.25> Total: 248424 W: 66020 L: 66030 D: 116374 Elo -0.01 Ptnml(0-2): 113, 24653, 74689, 24645, 112 closes https://github.com/official-stockfish/Stockfish/pull/4390 bench: 4098325 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: MinetaS
Date: Sat Feb 18 13:23:18 2023 +0100 Timestamp: 1676722998 Fix overflow in add_dpbusd_epi32x2 This patch fixes 16bit overflow in *_add_dpbusd_epi32x2 functions, that can be triggered in rare cases depending on the NNUE weights. While the code leads to some slowdown on affected architectures (most notably avx2), the fix is simpler than some of the other options discussed in https://github.com/official-stockfish/Stockfish/pull/4394 Code suggested by Sopel97. Result of "bench 4096 1 30 default depth nnue": | Architecture | master | patch (gcc) | patch (clang) | |---------------------|-----------|-------------|---------------| | x86-64-vnni512 | 762122798 | 762122798 | 762122798 | | x86-64-avx512 | 769723503 | 762122798 | 762122798 | | x86-64-bmi2 | 769723503 | 762122798 | 762122798 | | x86-64-ssse3 | 769723503 | 762122798 | 762122798 | | x86-64 | 762122798 | 762122798 | 762122798 | Following architectures will experience ~4% slowdown due to an additional instruction in the middle of hot path: * x86-64-avx512 * x86-64-bmi2 * x86-64-avx2 * x86-64-sse41-popcnt (x86-64-modern) * x86-64-ssse3 * x86-32-sse41-popcnt This patch clearly loses Elo against master with both STC and LTC. Failed non-regression STC (256bit fix only): LLR: -2.95 (-2.94,2.94) <-1.75,0.25> Total: 33528 W: 8769 L: 9049 D: 15710 Elo -2.90 Ptnml(0-2): 96, 3616, 9600, 3376, 76 https://tests.stockfishchess.org/tests/view/63e6a5b44299542b1e26a485 60+0.6 @ 30000 games: Elo: -1.67 +-1.7 (95%) LOS: 2.8% Total: 30000 W: 7848 L: 7992 D: 14160 Elo -1.67 Ptnml(0-2): 12, 2847, 9436, 2683, 22 nElo: -3.84 +-3.9 (95%) PairsRatio: 0.95 https://tests.stockfishchess.org/tests/view/63e7ac716d0e1db55f35a660 However, a test against nn-a3dc078bafc7.nnue, which is the latest "safe" network not causing the bug, passed with regular bounds. Passed STC: LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 160456 W: 42658 L: 42175 D: 75623 Elo +1.05 Ptnml(0-2): 487, 17638, 43469, 18173, 461 https://tests.stockfishchess.org/tests/view/63e89836d62a5d02b0fa82c8 closes https://github.com/official-stockfish/Stockfish/pull/4391 closes https://github.com/official-stockfish/Stockfish/pull/4394 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: Sat Feb 18 13:14:24 2023 +0100 Timestamp: 1676722464 update cuckoo link use webarchive to link to the cycle detection paper by Kervinck. closes https://github.com/official-stockfish/Stockfish/pull/4389 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: borg323
Date: Sat Feb 18 13:14:05 2023 +0100 Timestamp: 1676722445 Fix build on arm windows avoids the use of _mm_malloc on arm windows. fixes #4379 closes https://github.com/official-stockfish/Stockfish/pull/4388 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: Thu Feb 9 07:50:27 2023 +0100 Timestamp: 1675925427 Update default net to nn-1337b1adec5b.nnue Created by retraining the master net on a dataset composed of: * Most of the previous best dataset filtered to remove positions likely having only one good move * Adding training data from Leela T77 dec2021 rescored with 16tb of 7-piece tablebases Trained with end lambda 0.7 and max epoch 900. Positions with ply <= 28 were removed from most of the previous best dataset before training began. A new nnue-pytorch trainer param for skipping early plies was used to skip plies <= 24 in the unfiltered and additional Leela T77 parts of the dataset. ``` python easy_train.py \ --experiment-name leela96-dfrc99-T80octnovT79aprmayT60novdec-eval-filt-v2-T78augsep-12tb-T77dec-16tb-lambda7-sk24 \ --training-dataset /data/leela96-dfrc99-T80octnovT79aprmayT60novdec-eval-filt-v2-T78augsep-12tb-T77dec-16tb.binpack \ --nnue-pytorch-branch linrock/nnue-pytorch/easy-train-early-fen-skipping \ --early-fen-skipping 24 \ --gpus "0," \ --start-from-engine-test-net True \ --start-lambda 1.0 \ --end-lambda 0.7 \ --gamma 0.995 \ --lr 4.375e-4 \ --tui False \ --seed $RANDOM \ --max_epoch 900 ``` The depth6 multipv2 search filtering method is the same as the one used for filtering recent best datasets, with a lower eval difference threshold to remove slightly more positions than before. These parts of the dataset were filtered: * 96% of T60T70wIsRightFarseerT60T74T75T76.binpack * 99% of dfrc_n5000.binpack * T80 oct + nov 2022 data, no positions with castling flags, rescored with ~600gb 7p tablebases * T79 apr + may 2022 data, rescored with 12tb 7p tablebases * T60 nov + dec 2021 data, rescored with 12tb 7p tablebases These parts of the dataset were not filtered. Positions with ply <= 24 were skipped during training: * T78 aug + sep 2022 data, rescored with 12tb 7p tablebases * 84% of T77 dec 2021 data, rescored with 16tb 7p tablebases The code and exact evaluation thresholds used for data filtering can be found at: https://github.com/linrock/Stockfish/tree/tools-filter-multipv2-eval-diff-t2/src/filter The exact training data used can be found at: https://robotmoon.com/nnue-training-data/ Local elo at 25k nodes per move: nn-epoch859.nnue : 3.5 +/ 1.2 Passed STC: LLR: 2.95 (-2.94,2.94) <0.00,2.00> https://tests.stockfishchess.org/tests/view/63dfeefc73223e7f52ad769f Total: 219744 W: 58572 L: 58002 D: 103170 Elo +0.90 Ptnml(0-2): 609, 24446, 59284, 24832, 701 Passed LTC: https://tests.stockfishchess.org/tests/view/63e268fc73223e7f52ade7b6 LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 91256 W: 24528 L: 24121 D: 42607 Elo +1.55 Ptnml(0-2): 48, 8863, 27390, 9288, 39 closes https://github.com/official-stockfish/Stockfish/pull/4387 bench 3841998 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: Dubslow
Date: Thu Feb 9 07:46:41 2023 +0100 Timestamp: 1675925201 Update `complexityAverage` in all branches of static eval STC: https://tests.stockfishchess.org/tests/view/63dda49573223e7f52ad0f8c LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 117416 W: 31173 L: 31049 D: 55194 Elo +0.37 Ptnml(0-2): 290, 12246, 33533, 12328, 311 LTC: https://tests.stockfishchess.org/tests/view/63dfa90873223e7f52ad69b8 LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 44416 W: 11924 L: 11744 D: 20748 Elo +1.41 Ptnml(0-2): 5, 4036, 13968, 4172, 27 closes https://github.com/official-stockfish/Stockfish/pull/4385 bench 4758694 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 9 07:45:05 2023 +0100 Timestamp: 1675925105 Cleanup and reorder in qsearch This patch is a simplification / code normalisation in qsearch. Adds steps in comments the same way we have in search; Makes a separate "pruning" stage instead of heuristics randomly being spread over qsearch code; Reorders pruning heuristics from least taxing ones to more taxing ones; Removes repeated check for best value not being mated, instead uses 1 check - thus removes some lines of code. Moves prefetch and move setup after pruning - makes no sense to do them if move will actually get pruned. Passed non-regression test: https://tests.stockfishchess.org/tests/view/63dd2c5ff9a50a69252c1413 LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 113504 W: 29898 L: 29770 D: 53836 Elo +0.39 Ptnml(0-2): 287, 11861, 32327, 11991, 286 https://github.com/official-stockfish/Stockfish/pull/4382 Non-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: Thu Feb 9 07:42:52 2023 +0100 Timestamp: 1675924972 remove unnecessary variable pinned already has to be true for the bitwise & closes https://github.com/official-stockfish/Stockfish/pull/4381 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: pb00067
Date: Fri Feb 3 20:18:50 2023 +0100 Timestamp: 1675451930 Improve excluded move logic PR consists of 2 improvements on nodes with excludeMove: 1. Remove xoring the posKey with make_key(excludedMove) Since we never call tte->save anymore with excludedMove, the unique left purpose of the xoring was to avoid a TT hit. Nevertheless on a normal bench run this produced ~25 false positives (key collisions) To avoid that we now forbid early TT cutoff's with excludeMove Maybe these accesses to TT with xored key caused useless misses in the CPU caches (L1, L2 ...) Now doing the probe with the same key as the enclosing search does, should hit the CPU cache. 2. Don't probe Tablebases with excludedMove. This can't be tested on fishtest, but it's obvious that tablebases don't deliver any information about suboptimal moves. Side note: Very surprisingly it looks like we cannot use static eval's from TT since they slightly differ over time due to changing optimism. Attempts to use static eval's from TT did loose about 13 ELO. This is something about to investigate. LTC: https://tests.stockfishchess.org/tests/view/63dc0f8de9d4cdfbe672d0c6 LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 44736 W: 12046 L: 11733 D: 20957 Elo +2.43 Ptnml(0-2): 12, 4212, 13617, 4505, 22 An analogue of this passed STC & LTC see PR #4374 (thanks Dubslow for reviewing!) closes https://github.com/official-stockfish/Stockfish/pull/4380 Bench: 4758694 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: Fri Feb 3 20:15:09 2023 +0100 Timestamp: 1675451709 Remove reduced LMR capture bonus In LMR, simplify away the reduced capture bonus (i.e. if (capture) bonus /= 6). Non-regression STC: https://tests.stockfishchess.org/tests/view/63da1da9bbadd17b3787dced LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 28152 W: 7521 L: 7296 D: 13335 Elo +2.78 Ptnml(0-2): 76, 3069, 7568, 3280, 83 Non-regression LTC: https://tests.stockfishchess.org/tests/view/63da6ad4bbadd17b3787e98c LLR: 2.96 (-2.94,2.94) <-1.75,0.25> Total: 52472 W: 14120 L: 13941 D: 24411 Elo +1.19 Ptnml(0-2): 16, 5071, 15887, 5242, 20 closes https://github.com/official-stockfish/Stockfish/pull/4378 Bench: 4034016 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 Feb 3 20:10:08 2023 +0100 Timestamp: 1675451408 Simplify usage of optimism in complexity This patch removes one condition in optimism usage in complexity, now negative optimism also impacts it. Passed STC: https://tests.stockfishchess.org/tests/view/63d34f43721fe2bff692fb12 LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 204920 W: 54343 L: 54309 D: 96268 Elo +0.06 Ptnml(0-2): 598, 22648, 55897, 22756, 561 Passed LTC: https://tests.stockfishchess.org/tests/view/63d612a2a67dd929a556075c LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 200712 W: 53207 L: 53172 D: 94333 Elo +0.06 Ptnml(0-2): 58, 19664, 60901, 19651, 82 closes https://github.com/official-stockfish/Stockfish/pull/4377 bench 4204964 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: MinetaS
Date: Fri Feb 3 20:07:56 2023 +0100 Timestamp: 1675451276 Expand statistics tools for engine development This patch adds more debugging slots up to 32 per type and provide tools to calculate standard deviation and Pearson's correlation coefficient. However, due to slot being 0 at default, dbg_hit_on(c, b) has to be removed. Initial idea from snicolet/Stockfish@d8ab604 closes https://github.com/official-stockfish/Stockfish/pull/4354 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: Michael Chaly
Date: Thu Feb 2 18:00:14 2023 +0100 Timestamp: 1675357214 Do less SEE pruning in qsearch Current master prunes all moves with negative SEE values in qsearch. This patch sets constant negative threshold thus allowing some moves with negative SEE values to be searched. Value of threshold is completely arbitrary and can be tweaked - also it as function of depth can be tried. Original idea by author of Alexandria engine. Passed STC https://tests.stockfishchess.org/tests/view/63d79a59a67dd929a5564976 LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 34864 W: 9392 L: 9086 D: 16386 Elo +3.05 Ptnml(0-2): 113, 3742, 9429, 4022, 126 Passed LTC https://tests.stockfishchess.org/tests/view/63d8074aa67dd929a5565bc2 LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 91616 W: 24532 L: 24126 D: 42958 Elo +1.54 Ptnml(0-2): 32, 8840, 27662, 9238, 36 closes https://github.com/official-stockfish/Stockfish/pull/4376 Bench: 4010877 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 Feb 2 17:58:05 2023 +0100 Timestamp: 1675357085 Update WLD model update the WLD model with about 400M positions extracted from recent LTC games after the net updates. This ensures that the 50% win rate is again at 1.0 eval. closes https://github.com/official-stockfish/Stockfish/pull/4373 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: MinetaS
Date: Thu Feb 2 17:49:23 2023 +0100 Timestamp: 1675356563 Add -Wconditional-uninitialized when using Clang Add -Wconditional-uninitialized as it is not controlled by -Wall. closes https://github.com/official-stockfish/Stockfish/pull/4371 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: Thu Feb 2 17:45:57 2023 +0100 Timestamp: 1675356357 Decrease reduction for killer moves with good history If move is a main killer and we have a good history, decrease reduction. STC: https://tests.stockfishchess.org/tests/view/63d38b37721fe2bff693069a LLR: 2.95 (-2.94,2.94) <0.00,2.00> Total: 46688 W: 12542 L: 12222 D: 21924 Elo +2.38 Ptnml(0-2): 126, 5013, 12769, 5287, 149 LTC: https://tests.stockfishchess.org/tests/view/63d471e2bde6e5f3cb4be5d3 LLR: 2.93 (-2.94,2.94) <0.50,2.50> Total: 130976 W: 35033 L: 34555 D: 61388 Elo +1.27 Ptnml(0-2): 38, 12551, 39833, 13027, 39 closes https://github.com/official-stockfish/Stockfish/pull/4369 Bench: 4069938 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: MinetaS
Date: Sat Jan 28 16:54:30 2023 +0100 Timestamp: 1674921270 Remove maxNextDepth This patch allows full PV search to have double extensions as well when extension == 1 && doDeeperSearch && doEvenDeeperSearch && !doShallowerSearch is true, which is extremely rare to occur. Passed non-regression STC (master 3d2381d): LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 370824 W: 97835 L: 97974 D: 175015 Elo -0.13 Ptnml(0-2): 1073, 38814, 105731, 38767, 1027 https://tests.stockfishchess.org/tests/view/63c89416a83c702aac08314c Passed non-regression LTC (master 3d2381d): LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 306048 W: 81173 L: 81237 D: 143638 Elo -0.07 Ptnml(0-2): 117, 27977, 96901, 27911, 118 https://tests.stockfishchess.org/tests/view/63cc4e84344bb01c191b2658 Bench: 4208265 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: Dubslow
Date: Sat Jan 28 16:50:46 2023 +0100 Timestamp: 1674921046 Remove `previousDepth` in favor of `completedDepth + 2` Beyond the simplification, this could be considered a bugfix from a certain point of view. However, the effect is very subtle and essentially impossible for users to notice. 5372f81cc8 added about 2 Elo at LTC, but only for second and later `go` commands; now, with this patch, the first `go` command will also benefit from that gain. Games under time controls are unaffected (as per the tests). STC: https://tests.stockfishchess.org/tests/view/63c3d291330c0d3d051d48a8 LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 473792 W: 124858 L: 125104 D: 223830 Elo -0.18 Ptnml(0-2): 1338, 49653, 135063, 49601, 1241 LTC: https://tests.stockfishchess.org/tests/view/63c8cd56a83c702aac083bc9 LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 290728 W: 76926 L: 76978 D: 136824 Elo -0.06 Ptnml(0-2): 106, 27987, 89221, 27953, 97 closes https://github.com/official-stockfish/Stockfish/pull/4361 bench 4208265 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: Sebastian Buchwald
Date: Sat Jan 28 16:49:27 2023 +0100 Timestamp: 1674920967 Remove redundant const qualifiers The const qualifiers are already implied by the constexpr qualifiers. closes https://github.com/official-stockfish/Stockfish/pull/4359 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: Sebastian Buchwald
Date: Sat Jan 28 16:47:52 2023 +0100 Timestamp: 1674920872 Simplify functions to read/write network parameters closes https://github.com/official-stockfish/Stockfish/pull/4358 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: Sat Jan 28 16:37:29 2023 +0100 Timestamp: 1674920249 Fixed UCI TB win values This patch results in search values for a TB win/loss to be reported in a way that does not change with normalization, i.e. will be consistent over time. A value of 200.00 pawns is now reported upon entering a TB won position. Values smaller than 200.00 relate to the distance in plies from the root to the probed position position, with 1 cp being 1 ply distance. closes https://github.com/official-stockfish/Stockfish/pull/4353 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: Michael Chaly
Date: Wed Jan 25 07:51:19 2023 +0100 Timestamp: 1674629479 Rebalance usage of history heuristics in pruning This patch has multiple effects: * history heuristics sum in futility pruning now can't exceed some negative value so futility pruning for moves with negative histories should become slightly less aggressive; * history heuristics are now used in SEE pruning for quiet moves; Passed STC: https://tests.stockfishchess.org/tests/view/63cde339c93e8828d0f02e3a LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 88424 W: 23681 L: 23303 D: 41440 Elo +1.49 Ptnml(0-2): 258, 9559, 24219, 9899, 277 Passed LTC: https://tests.stockfishchess.org/tests/view/63ce9009c93e8828d0f04e4f LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 79536 W: 21223 L: 20843 D: 37470 Elo +1.66 Ptnml(0-2): 22, 7599, 24146, 7979, 22 closes https://github.com/official-stockfish/Stockfish/pull/4355 Bench: 4208265 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: Dubslow
Date: Wed Jan 25 07:48:39 2023 +0100 Timestamp: 1674629319 `stat_bonus`: replace quadratic with nearly identical line passed stc: https://tests.stockfishchess.org/tests/view/63ca58c90eefe8694a0c4eac LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 287960 W: 76146 L: 76201 D: 135613 Elo -0.07 Ptnml(0-2): 947, 31890, 78307, 31943, 893 passed ltc: https://tests.stockfishchess.org/tests/view/63cc8a51344bb01c191b30f0 LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 73784 W: 19559 L: 19402 D: 34823 Elo +0.74 Ptnml(0-2): 33, 7171, 22327, 7328, 33 closes https://github.com/official-stockfish/Stockfish/pull/4352 bench 3990490 see source |