| 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: Mon Feb 27 08:29:47 2023 +0100 Timestamp: 1677482987 Unify type alias declarations The commit unifies the declaration of type aliases by replacing all typedefs with corresponding using statements. closing https://github.com/official-stockfish/Stockfish/pull/4412 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: Mon Feb 27 08:28:45 2023 +0100 Timestamp: 1677482925 NNUE accumulator update in probcut. Call the recently added hint function for NNUE accumulator update after a failed probcut search. In this case we already searched at least some captures and tt move which, however, is not sufficient for a cutoff. So it seems we have a greater chance that the full search will also have no cutoff and hence all moves have to be searched. STC: https://tests.stockfishchess.org/tests/view/63fa74a4e74a12625bce1823 LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 70096 W: 18770 L: 18423 D: 32903 Elo +1.72 Ptnml(0-2): 191, 7342, 19654, 7651, 210 To be sure that we have no heavy interaction retest on top of #4410. Rebased STC: https://tests.stockfishchess.org/tests/view/63fb2f62e74a12625bce3b03 LLR: 2.95 (-2.94,2.94) <0.00,2.00> Total: 137688 W: 36790 L: 36349 D: 64549 Elo +1.11 Ptnml(0-2): 397, 14373, 38919, 14702, 453 closes https://github.com/official-stockfish/Stockfish/pull/4411 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: Mon Feb 27 08:27:26 2023 +0100 Timestamp: 1677482846 Use common_parent_position hint also at PVNodes TT hits. Credits to Stefan Geschwentner (locutus2) showing that the hint is useful on PvNodes. In contrast to his test, this version avoids to use the hint when in check. I believe checking positions aren't good candidates for the hint because: - evasion moves are rather few, so a checking pos. has much less childs than a normal position - if the king has to move the NNUE eval can't use incremental updates, so the child nodes have to do a full refresh anyway. Passed STC: https://tests.stockfishchess.org/tests/view/63f9c5b1e74a12625bcdf585 LLR: 2.95 (-2.94,2.94) <0.00,2.00> Total: 124472 W: 33268 L: 32846 D: 58358 Elo +1.18 Ptnml(0-2): 350, 12986, 35170, 13352, 378 closes https://github.com/official-stockfish/Stockfish/pull/4410 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: Alfredo Menezes
Date: Mon Feb 27 08:26:29 2023 +0100 Timestamp: 1677482789 Simplify condition in step 15 Remove 'ttValue <= alpha' check for negative extension in singular search. Also apply some small code style changes. STC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 127888 W: 33766 L: 33651 D: 60471 Elo +0.31 Ptnml(0-2): 303, 14082, 35089, 14137, 333 https://tests.stockfishchess.org/tests/view/63f79528e74a12625bcd8c05 LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 89048 W: 23924 L: 23782 D: 41342 Elo +0.55 Ptnml(0-2): 27, 8635, 27065, 8763, 34 https://tests.stockfishchess.org/tests/view/63f82177e74a12625bcda6f4 LTC (retest): LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 196360 W: 52514 L: 52475 D: 91371 Elo +0.07 Ptnml(0-2): 103, 19066, 59780, 19151, 80 https://tests.stockfishchess.org/tests/view/63f934bfe74a12625bcdd929 closes https://github.com/official-stockfish/Stockfish/pull/4407 Bench: 5310866 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 24 20:14:44 2023 +0100 Timestamp: 1677266084 Search tuning at very long time control This patch is a result of tuning session of approximately 100k games at 120+1.2. Biggest changes are in extensions, stat bonus and depth reduction for nodes without a tt move. Failed STC: https://tests.stockfishchess.org/tests/view/63f72c72e74a12625bcd7938 LLR: -2.94 (-2.94,2.94) <0.00,2.00> Total: 13872 W: 3535 L: 3769 D: 6568 Elo -5.86 Ptnml(0-2): 56, 1621, 3800, 1419, 40 Close to neutral at LTC: https://tests.stockfishchess.org/tests/view/63f738f5e74a12625bcd7b8a Elo: 0.80 +-1.2 (95%) LOS: 90.0% Total: 60000 W: 16213 L: 16074 D: 27713 Elo +0.80 Ptnml(0-2): 24, 5718, 18379, 5853, 26 nElo: 1.82 +-2.8 (95%) PairsRatio: 1.02 Passed 180+1.8 VLTC: https://tests.stockfishchess.org/tests/view/63f868f3e74a12625bcdb33e LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 15864 W: 4449 L: 4202 D: 7213 Elo +5.41 Ptnml(0-2): 1, 1301, 5083, 1544, 3 Passed 60+0.6 8 threads SMP VLTC: https://tests.stockfishchess.org/tests/view/63f8a5d6e74a12625bcdbdb3 LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 6288 W: 1821 L: 1604 D: 2863 Elo +11.99 Ptnml(0-2): 0, 402, 2123, 619, 0 closes https://github.com/official-stockfish/Stockfish/pull/4406 bench 4705194 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: Fri Feb 24 20:12:53 2023 +0100 Timestamp: 1677265973 Fix typo in method name closes https://github.com/official-stockfish/Stockfish/pull/4404 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 23 13:27:57 2023 +0100 Timestamp: 1677155277 Reintroduce nnue pawn scaling with lower lazy thresholds Params found with the nevergrad TBPSA optimizer via nevergrad4sf modified to: * use SPRT LLR with fishtest STC elo gainer bounds [0, 2] as the objective function * increase the game batch size after each new optimal point is found The params were the optimal point after TBPSA iteration 7 and 160 nevergrad evaluations with: * initial batch size of 96 games per evaluation * batch size increase of 64 games after each iteration * a budget of 512 evaluations * TC: fixed 1.5 million nodes per move, no time limit nevergrad4sf enables optimizing stockfish params with TBPSA: https://github.com/vondele/nevergrad4sf Using pentanomial game results with smaller game batch sizes was inspired by: Use of SPRT LLR calculated from pentanomial game results as the objective function was an experiment at maximizing the information from game batches to reduce the computational cost for TBPSA to converge on good parameters. For the exact code used to find the params: https://github.com/linrock/tuning-fork Passed STC: https://tests.stockfishchess.org/tests/view/63f4ef5ee74a12625bcd114a LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 66552 W: 17736 L: 17390 D: 31426 Elo +1.81 Ptnml(0-2): 164, 7229, 18166, 7531, 186 Passed LTC: https://tests.stockfishchess.org/tests/view/63f56028e74a12625bcd2550 LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 71264 W: 19150 L: 18787 D: 33327 Elo +1.77 Ptnml(0-2): 23, 6728, 21771, 7083, 27 closes https://github.com/official-stockfish/Stockfish/pull/4401 bench 3687580 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 23 13:25:35 2023 +0100 Timestamp: 1677155135 Introduce a function to compute NNUE accumulator This patch introduces `hint_common_parent_position()` to signal that potentially several child nodes will require an NNUE eval. By populating explicitly the accumulator, these subsequent evaluations can be performed more efficiently. This was based on the observation that calculating the evaluation in an excluded move position yielded a significant Elo gain, even though the evaluation itself was already available (work by pb00067). Sopel wrote the code to perform just the accumulator update. This PR is based on cleaned up code that passed STC: https://tests.stockfishchess.org/tests/view/63f62f9be74a12625bcd4aa0 LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 110368 W: 29607 L: 29167 D: 51594 Elo +1.39 Ptnml(0-2): 41, 10551, 33572, 10967, 53 and in an the earlier (equivalent) version passed STC: https://tests.stockfishchess.org/tests/view/63f3c3fee74a12625bcce2a6 LLR: 2.95 (-2.94,2.94) <0.00,2.00> Total: 47552 W: 12786 L: 12467 D: 22299 Elo +2.33 Ptnml(0-2): 120, 5107, 12997, 5438, 114 passed LTC: https://tests.stockfishchess.org/tests/view/63f45cc2e74a12625bccfa63 LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 110368 W: 29607 L: 29167 D: 51594 Elo +1.39 Ptnml(0-2): 41, 10551, 33572, 10967, 53 closes https://github.com/official-stockfish/Stockfish/pull/4402 Bench: 3726250 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: Thu Feb 23 13:24:37 2023 +0100 Timestamp: 1677155077 Remove unused macros closes https://github.com/official-stockfish/Stockfish/pull/4397 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: Thu Feb 23 13:22:03 2023 +0100 Timestamp: 1677154923 Add support for ARM dot product instructions The sdot instruction computes (and accumulates) a signed dot product, which is quite handy for Stockfish's NNUE code. The instruction is optional for Armv8.2 and Armv8.3, and mandatory for Armv8.4 and above. The commit adds a new 'arm-dotprod' architecture with enabled dot product support. It also enables dot product support for the existing 'apple-silicon' architecture, which is at least Armv8.5. The following local speed test was performed on an Apple M1 with ARCH=apple-silicon. I had to remove CPU pinning from the benchmark script. However, the results were still consistent: Checking both binaries against themselves reported a speedup of +0.0000 and +0.0005, respectively. ``` Result of 100 runs ================== base (...ish.037ef3e1) = 1917997 +/- 7152 test (...fish.dotprod) = 2159682 +/- 9066 diff = +241684 +/- 2923 speedup = +0.1260 P(speedup > 0) = 1.0000 CPU: 10 x arm Hyperthreading: off ``` Fixes #4193 closes https://github.com/official-stockfish/Stockfish/pull/4400 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: 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 |