| 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: Sat Jul 9 10:58:04 2022 +0200 Timestamp: 1657357084 Limit the researching at same depth. If the elapsed time is close to the available time, the time management thread can signal that the next iterations should be searched at the same depth (Threads.increaseDepth = false). While the rootDepth increases, the adjustedDepth is kept constant with the searchAgainCounter. In exceptional cases, when threading is used and the master thread, which controls the time management, signals to not increaseDepth, but by itself takes a long time to finish the iteration, the helper threads can search repeatedly at the same depth. This search finishes more and more quickly, leading to helper threads that report a rootDepth of MAX_DEPTH (245). The latter is not optimal as it is confusing for the user, stops search on these threads, and leads to an incorrect bias in the thread voting scheme. Probably with only a small impact on strength. This behavior was observed almost two years ago, see https://github.com/official-stockfish/Stockfish/issues/2717 This patch fixes #2717 by ensuring the effective depth increases at once every four iterations, even in increaseDepth is false. Depth 245 searches (for non-trivial positions) were indeed absent with this patch, but frequent with master in the tests below: https://discord.com/channels/435943710472011776/813919248455827515/994872720800088095 Total pgns: 2173 Base: 2867 Patch: 0 it passed non-regression testing in various setups: SMP STC: https://tests.stockfishchess.org/tests/view/62bfecc96178ffe6394ba036 LLR: 2.94 (-2.94,2.94) <-2.25,0.25> Total: 37288 W: 10171 L: 10029 D: 17088 Elo +1.32 Ptnml(0-2): 75, 3777, 10793, 3929, 70 SMP LTC: https://tests.stockfishchess.org/tests/view/62c08f6f49b62510394be066 LLR: 2.94 (-2.94,2.94) <-2.25,0.25> Total: 190568 W: 52125 L: 52186 D: 86257 Elo -0.11 Ptnml(0-2): 70, 17854, 59504, 17779, 77 LTC: https://tests.stockfishchess.org/tests/view/62c08b6049b62510394bdfb6 LLR: 2.96 (-2.94,2.94) <-2.25,0.25> Total: 48120 W: 13204 L: 13083 D: 21833 Elo +0.87 Ptnml(0-2): 54, 4458, 14919, 4571, 58 Special thanks to miguel-I, Disservin, ruicoelhopedro and others for analysing the problem, the data, and coming up with the key insight, needed to fix this longstanding issue. closes https://github.com/official-stockfish/Stockfish/pull/4104 Bench: 5182295 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 Jul 9 10:53:17 2022 +0200 Timestamp: 1657356797 Time mgmt fix division. oversight changed the corresponding float division to integer division in a previous tune https://github.com/official-stockfish/Stockfish/commit/442c40b43de8ede1e424efa674c8d45322e3b43c it is stronger to keep the original float division. green LTC: https://tests.stockfishchess.org/tests/view/62bf34bc0340fb1e0cc934e7 LLR: 2.94 (-2.94,2.94) <0.50,3.00> Total: 38952 W: 10738 L: 10467 D: 17747 Elo +2.42 Ptnml(0-2): 46, 3576, 11968, 3833, 53 yellow STC: https://tests.stockfishchess.org/tests/view/62bff6506178ffe6394ba1d1 LLR: -2.95 (-2.94,2.94) <0.00,2.50> Total: 226960 W: 61265 L: 61062 D: 104633 Elo +0.31 Ptnml(0-2): 938, 24398, 62582, 24647, 915 further slightly tweaked tests confirm this Elo gain. closes https://github.com/official-stockfish/Stockfish/pull/4097 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: Tue Jul 5 13:55:50 2022 +0200 Timestamp: 1657022150 Simplify away FRC correction term Since new net is trained partially using FRC data this part of adjustment that penalises bishops that are locked in the corner is no longer needed - net should "know" this things itself much better. STC on FRC book : https://tests.stockfishchess.org/tests/view/62c3031b9e7d9997a12d852f LLR: 2.96 (-2.94,2.94) <-2.25,0.25> Total: 22048 W: 3003 L: 2845 D: 16200 Elo +2.49 Ptnml(0-2): 96, 1778, 7149, 1874, 127 LTC on FRC book : https://tests.stockfishchess.org/tests/view/62c32e939e7d9997a12d8c5e LLR: 2.94 (-2.94,2.94) <-2.25,0.25> Total: 36784 W: 3138 L: 3037 D: 30609 Elo +0.95 Ptnml(0-2): 36, 1842, 14537, 1939, 38 STC on DFRC book : https://tests.stockfishchess.org/tests/view/62c32efb9e7d9997a12d8c6f LLR: 2.94 (-2.94,2.94) <-2.25,0.25> Total: 20424 W: 3903 L: 3721 D: 12800 Elo +3.10 Ptnml(0-2): 172, 1984, 5724, 2154, 178 LTC on DFRC book : https://tests.stockfishchess.org/tests/view/62c358c79e7d9997a12d9319 LLR: 2.93 (-2.94,2.94) <-2.25,0.25> Total: 53784 W: 7581 L: 7480 D: 38723 Elo +0.65 Ptnml(0-2): 87, 3887, 18856, 3962, 100 closes https://github.com/official-stockfish/Stockfish/pull/4101 bench 5182295 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: Mon Jul 4 15:42:34 2022 +0200 Timestamp: 1656942154 Update default net to nn-3c0054ea9860.nnu First things first... this PR is being made from court. Today, Tord and Stéphane, with broad support of the developer community are defending their complaint, filed in Munich, against ChessBase. With their products Houdini 6 and Fat Fritz 2, both Stockfish derivatives, ChessBase violated repeatedly the Stockfish GPLv3 license. Tord and Stéphane have terminated their license with ChessBase permanently. Today we have the opportunity to present our evidence to the judge and enforce that termination. To read up, have a look at our blog post https://stockfishchess.org/blog/2022/public-court-hearing-soon/ and https://stockfishchess.org/blog/2021/our-lawsuit-against-chessbase/ This PR introduces a net trained with an enhanced data set and a modified loss function in the trainer. A slight adjustment for the scaling was needed to get a pass on standard chess. passed STC: https://tests.stockfishchess.org/tests/view/62c0527a49b62510394bd610 LLR: 2.94 (-2.94,2.94) <0.00,2.50> Total: 135008 W: 36614 L: 36152 D: 62242 Elo +1.19 Ptnml(0-2): 640, 15184, 35407, 15620, 653 passed LTC: https://tests.stockfishchess.org/tests/view/62c17e459e7d9997a12d458e LLR: 2.94 (-2.94,2.94) <0.50,3.00> Total: 28864 W: 8007 L: 7749 D: 13108 Elo +3.11 Ptnml(0-2): 47, 2810, 8466, 3056, 53 Local testing at a fixed 25k nodes resulted in Test run1026/easy_train_data/experiments/experiment_2/training/run_0/nn-epoch799.nnue localElo: 4.2 +- 1.6 The real strength of the net is in FRC and DFRC chess where it gains significantly. Tested at STC with slightly different scaling: FRC: https://tests.stockfishchess.org/tests/view/62c13a4002ba5d0a774d20d4 Elo: 29.78 +-3.4 (95%) LOS: 100.0% Total: 10000 W: 2007 L: 1152 D: 6841 Elo +29.78 Ptnml(0-2): 31, 686, 2804, 1355, 124 nElo: 59.24 +-6.9 (95%) PairsRatio: 2.06 DFRC: https://tests.stockfishchess.org/tests/view/62c13a5702ba5d0a774d20d9 Elo: 55.25 +-3.9 (95%) LOS: 100.0% Total: 10000 W: 2984 L: 1407 D: 5609 Elo +55.25 Ptnml(0-2): 51, 636, 2266, 1779, 268 nElo: 96.95 +-7.2 (95%) PairsRatio: 2.98 Tested at LTC with identical scaling: FRC: https://tests.stockfishchess.org/tests/view/62c26a3c9e7d9997a12d6caf Elo: 16.20 +-2.5 (95%) LOS: 100.0% Total: 10000 W: 1192 L: 726 D: 8082 Elo +16.20 Ptnml(0-2): 10, 403, 3727, 831, 29 nElo: 44.12 +-6.7 (95%) PairsRatio: 2.08 DFRC: https://tests.stockfishchess.org/tests/view/62c26a539e7d9997a12d6cb2 Elo: 40.94 +-3.0 (95%) LOS: 100.0% Total: 10000 W: 2215 L: 1042 D: 6743 Elo +40.94 Ptnml(0-2): 10, 410, 3053, 1451, 76 nElo: 92.77 +-6.9 (95%) PairsRatio: 3.64 This is due to the mixing in a significant fraction of DFRC training data in the final training round. The net is trained using the easy_train.py script in the following way: ``` python easy_train.py \ --training-dataset=../Leela-dfrc_n5000.binpack \ --experiment-name=2 \ --nnue-pytorch-branch=vondele/nnue-pytorch/lossScan4 \ --additional-training-arg=--param-index=2 \ --start-lambda=1.0 \ --end-lambda=0.75 \ --gamma=0.995 \ --lr=4.375e-4 \ --start-from-engine-test-net True \ --tui=False \ --seed=$RANDOM \ --max_epoch=800 \ --auto-exit-timeout-on-training-finished=900 \ --network-testing-threads 8 \ --num-workers 12 ``` where the data set used (Leela-dfrc_n5000.binpack) is a combination of our previous best data set (mix of Leela and some SF data) and DFRC data, interleaved to form: The data is available in https://drive.google.com/drive/folders/1S9-ZiQa_3ApmjBtl2e8SyHxj4zG4V8gG?usp=sharing Leela mix: https://drive.google.com/file/d/1JUkMhHSfgIYCjfDNKZUMYZt6L5I7Ra6G/view?usp=sharing DFRC: https://drive.google.com/file/d/17vDaff9LAsVo_1OfsgWAIYqJtqR8aHlm/view?usp=sharing The training branch used is https://github.com/vondele/nnue-pytorch/commits/lossScan4 A PR to the main trainer repo will be made later. This contains a revised loss function, now computing the loss from the score based on the win rate model, which is a more accurate representation than what we had before. Scaling constants are tweaked there as well. closes https://github.com/official-stockfish/Stockfish/pull/4100 Bench: 5186781 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: Mon Jun 20 08:30:57 2022 +0200 Timestamp: 1655706657 Use NNUE complexity in search, retune related parameters This builds on ideas of xoto10 and mstembera to use more output from NNUE in the search algorithm. passed STC: https://tests.stockfishchess.org/tests/view/62ae454fe7ee5525ef88a957 LLR: 2.95 (-2.94,2.94) <0.00,2.50> Total: 89208 W: 24127 L: 23753 D: 41328 Elo +1.46 Ptnml(0-2): 400, 9886, 23642, 10292, 384 passed LTC: https://tests.stockfishchess.org/tests/view/62acc6ddd89eb6cf1e0750a1 LLR: 2.93 (-2.94,2.94) <0.50,3.00> Total: 56352 W: 15430 L: 15115 D: 25807 Elo +1.94 Ptnml(0-2): 44, 5501, 16782, 5794, 55 closes https://github.com/official-stockfish/Stockfish/pull/4088 bench 5332964 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: Mon Jun 20 08:25:50 2022 +0200 Timestamp: 1655706350 LMR: remove `deeper` ...apparently it wasn't doing much anymore. inspired by rufish's recent attempts to improve this. passed STC: https://tests.stockfishchess.org/tests/view/62abca2cd89eb6cf1e072c04 LLR: 2.95 (-2.94,2.94) <-2.25,0.25> Total: 85576 W: 22766 L: 22683 D: 40127 Elo +0.34 Ptnml(0-2): 362, 9607, 22741, 9742, 336 passed LTC: https://tests.stockfishchess.org/tests/view/62ac90ffd89eb6cf1e07488f LLR: 2.93 (-2.94,2.94) <-2.25,0.25> Total: 48248 W: 13018 L: 12896 D: 22334 Elo +0.88 Ptnml(0-2): 32, 4773, 14400, 4879, 40 closes https://github.com/official-stockfish/Stockfish/pull/4088 bench 5578988 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: bmc4
Date: Mon Jun 20 08:24:07 2022 +0200 Timestamp: 1655706247 Don't change ttPv at probCut STC: LLR: 2.96 (-2.94,2.94) <-2.25,0.25> Total: 35672 W: 9618 L: 9462 D: 16592 Elo +1.52 Ptnml(0-2): 151, 3890, 9601, 4040, 154 https://tests.stockfishchess.org/tests/view/62ab03f750949cfc241b1965 LTC: LLR: 2.93 (-2.94,2.94) <-2.25,0.25> Total: 54160 W: 14626 L: 14511 D: 25023 Elo +0.74 Ptnml(0-2): 42, 5414, 16056, 5523, 45 https://tests.stockfishchess.org/tests/view/62ab5e6fd89eb6cf1e071b87 closes https://github.com/official-stockfish/Stockfish/pull/4088 bench: 5798229 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: bmc4
Date: Thu Jun 16 07:12:01 2022 +0200 Timestamp: 1655356321 Simplify away condition in ttSave in probCut Remove condition for tte->save in probCut so it always saves on probCut cutoff. STC: LLR: 2.95 (-2.94,2.94) <-2.25,0.25> Total: 47848 W: 12921 L: 12782 D: 22145 Elo +1.01 Ptnml(0-2): 207, 5340, 12715, 5431, 231 https://tests.stockfishchess.org/tests/view/62a1f7c87bd8e641e44436f7 LTC: LLR: 2.97 (-2.94,2.94) <-2.25,0.25> Total: 132736 W: 35895 L: 35881 D: 60960 Elo +0.04 Ptnml(0-2): 109, 13384, 39360, 13414, 101 https://tests.stockfishchess.org/tests/view/62a2421a7bd8e641e444434f closes https://github.com/official-stockfish/Stockfish/pull/4069 bench: 5845802 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: Thu Jun 16 07:06:43 2022 +0200 Timestamp: 1655356003 Minor simplifications and cleanup in search STC: https://tests.stockfishchess.org/tests/view/629d6775593a4a9b6482c1ec LLR: 2.93 (-2.94,2.94) <-2.25,0.25> Total: 77416 W: 20683 L: 20589 D: 36144 Elo +0.42 Ptnml(0-2): 317, 8690, 20620, 8744, 337 LTC: https://tests.stockfishchess.org/tests/view/629db4be593a4a9b6482ceef LLR: 2.95 (-2.94,2.94) <-2.25,0.25> Total: 106544 W: 28752 L: 28705 D: 49087 Elo +0.15 Ptnml(0-2): 97, 10692, 31641, 10751, 91 closes https://github.com/official-stockfish/Stockfish/pull/4059 Bench: 5913510 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 for modern computers Windows x64 + SSSE3 Windows x64 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64 | Author: ppigazzini
Date: Thu Jun 16 07:03:52 2022 +0200 Timestamp: 1655355832 Restore NDKv21 for GitHub Actions GitHub updated the versions of NDK installed on the Actions runners breaking the ARM tests. Restore the NDKv21 using the GitHub suggested mitigation, see: https://github.com/actions/virtual-environments/issues/5595 closes https://github.com/official-stockfish/Stockfish/pull/4077 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: candirufish
Date: Tue Jun 7 08:34:14 2022 +0200 Timestamp: 1654583654 Use qsearch on step 11 if depth is equal to or below 0 larger reduction of depth if no TT entry is found, and go in qsearch as needed. stc: https://tests.stockfishchess.org/tests/view/629dfacd593a4a9b6482db72 LLR: 2.93 (-2.94,2.94) <0.00,2.50> Total: 31920 W: 8591 L: 8322 D: 15007 Elo +2.93 Ptnml(0-2): 127, 3551, 8376, 3738, 168 ltc: https://tests.stockfishchess.org/tests/view/629e304e593a4a9b6482e451 LLR: 2.95 (-2.94,2.94) <0.50,3.00> Total: 17488 W: 4842 L: 4614 D: 8032 Elo +4.53 Ptnml(0-2): 13, 1670, 5151, 1896, 14 closes https://github.com/official-stockfish/Stockfish/pull/4056 Bench: 5870283 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: Boštjan Mejak
Date: Tue Jun 7 08:30:07 2022 +0200 Timestamp: 1654583407 Wording of help output and comments. Improved the output text that is diplayed when executing the 'help' command. Also, some comments were fixed along the way. closes https://github.com/official-stockfish/Stockfish/pull/4048 closes https://github.com/official-stockfish/Stockfish/pull/4044 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: Thu Jun 2 07:49:31 2022 +0200 Timestamp: 1654148971 Remove LMR condition for complex pos Inspired by Kia's similar test: https://tests.stockfishchess.org/tests/view/6292898c1e7cd5f29966fbe0 Passed STC: https://tests.stockfishchess.org/tests/view/62941588b0d5a7d1b780ed4b LLR: 2.94 (-2.94,2.94) <-2.25,0.25> Total: 266872 W: 70850 L: 71033 D: 124989 Elo -0.24 Ptnml(0-2): 1180, 30114, 70941, 30111, 1090 Passed LTC: https://tests.stockfishchess.org/tests/view/62964a754628d33daa24f062 LLR: 2.95 (-2.94,2.94) <-2.25,0.25> Total: 70160 W: 18756 L: 18662 D: 32742 Elo +0.47 Ptnml(0-2): 42, 6976, 20950, 7070, 42 closes https://github.com/official-stockfish/Stockfish/pull/4047 Bench 6237567 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: xoto10
Date: Thu Jun 2 07:47:23 2022 +0200 Timestamp: 1654148843 Blend nnue complexity with classical. Following mstembera's test of the complexity value derived from nnue values, this change blends that idea with the old complexity calculation. STC 10+0.1: LLR: 2.95 (-2.94,2.94) <0.00,2.50> Total: 42320 W: 11436 L: 11148 D: 19736 Elo +2.36 Ptnml(0-2): 209, 4585, 11263, 4915, 188 https://tests.stockfishchess.org/tests/live_elo/6295c9239c8c2fcb2bad7fd9 LTC 60+0.6: LLR: 2.98 (-2.94,2.94) <0.50,3.00> Total: 34600 W: 9393 L: 9125 D: 16082 Elo +2.69 Ptnml(0-2): 32, 3323, 10319, 3597, 29 https://tests.stockfishchess.org/tests/view/6295fd5d9c8c2fcb2bad88cf closes https://github.com/official-stockfish/Stockfish/pull/4046 Bench 6078140 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: candirufish
Date: Thu Jun 2 07:44:22 2022 +0200 Timestamp: 1654148662 cutnode and movecount lmr extension simplification Passed STC https://tests.stockfishchess.org/tests/view/6294133cb0d5a7d1b780ece3 LLR: 2.94 (-2.94,2.94) <-2.25,0.25> Total: 41072 W: 11052 L: 10908 D: 19112 Elo +1.22 Ptnml(0-2): 153, 4324, 11461, 4422, 176 Passed LTC ltc: https://tests.stockfishchess.org/tests/view/62947ae6b0d5a7d1b780fe86 LLR: 2.94 (-2.94,2.94) <-2.25,0.25> Total: 102736 W: 27509 L: 27459 D: 47768 Elo +0.17 Ptnml(0-2): 98, 9734, 31669, 9754, 113 closes https://github.com/official-stockfish/Stockfish/pull/4045 Bench: 6410652 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 Jun 2 07:43:14 2022 +0200 Timestamp: 1654148594 Add info about elo gained from some heuristics Add info about qsearch and impact of main and continuation histories. Based on these tests: https://tests.stockfishchess.org/tests/view/62946ffcb0d5a7d1b780fc7e https://tests.stockfishchess.org/tests/view/628facb71e7cd5f299669534 https://tests.stockfishchess.org/tests/view/628eade11e7cd5f299666f2e closes https://github.com/official-stockfish/Stockfish/pull/4041 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: xoto10
Date: Sun May 29 19:14:20 2022 +0200 Timestamp: 1653844460 Adjust scale param higher xoto10's scaleopt tune resulted in a yellow LTC, but the main parameter shift looked almost exactly like the tune rate reduction schedule, so further increases of that param were tried. Joint work xoto10 and dubslow. passed LTC: https://tests.stockfishchess.org/tests/view/628c709372775f382300f03e LLR: 2.93 (-2.94,2.94) <0.50,3.00> Total: 70112 W: 18932 L: 18584 D: 32596 Elo +1.72 Ptnml(0-2): 66, 6904, 20757, 7274, 55 failed STC: https://tests.stockfishchess.org/tests/view/6290e4441e7cd5f29966bdc8 LLR: -2.96 (-2.94,2.94) <0.00,2.50> Total: 59976 W: 15919 L: 16018 D: 28039 Elo -0.57 Ptnml(0-2): 250, 6791, 15974, 6754, 219 similar LTC's were yellow first yellow LTC: https://tests.stockfishchess.org/tests/view/6288a33f817227d3e5c5b05d double exaggerate yellow: https://tests.stockfishchess.org/tests/live_elo/628e140372775f38230129a6 triple exaggerate yellow: https://tests.stockfishchess.org/tests/live_elo/628e2caf72775f3823012d45 closes https://github.com/official-stockfish/Stockfish/pull/4036 bench 6410652 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: proukornew
Date: Sun May 29 19:04:25 2022 +0200 Timestamp: 1653843865 Improve handling of variables set in the make environment removes duplication on the commandline for example in a profile-build closes https://github.com/official-stockfish/Stockfish/pull/3859 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: Giacomo Lorenzetti
Date: Sun May 29 18:54:19 2022 +0200 Timestamp: 1653843259 Small speedup in futility_move_count The speedup is around 0.25% using gcc 11.3.1 (bmi2, nnue bench, depth 16 and 23) while it is neutral using clang (same conditions). According to `perf` that integer division was one of the most time-consuming instructions in search (gcc disassembly). Passed STC: https://tests.stockfishchess.org/tests/view/628a17fe24a074e5cd59b3aa LLR: 2.94 (-2.94,2.94) <0.00,2.50> Total: 22232 W: 5992 L: 5751 D: 10489 Elo +3.77 Ptnml(0-2): 88, 2235, 6218, 2498, 77 yellow LTC: https://tests.stockfishchess.org/tests/view/628a35d7ccae0450e35106f7 LLR: -2.95 (-2.94,2.94) <0.50,3.00> Total: 320168 W: 85853 L: 85326 D: 148989 Elo +0.57 Ptnml(0-2): 185, 29698, 99821, 30165, 215 This patch also suggests that UHO STC is sensible to small speedups (< 0.50%). closes https://github.com/official-stockfish/Stockfish/pull/4032 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: Sun May 29 18:46:35 2022 +0200 Timestamp: 1653842795 Add command line flags to link to information This patch provides command line flags `--help` and `--license` as well as the corresponding `help` and `license` commands. ``` $ ./stockfish --help Stockfish 200522 by the Stockfish developers (see AUTHORS file) Stockfish is a powerful chess engine and free software licensed under the GNU GPLv3. Stockfish is normally used with a separate graphical user interface (GUI). Stockfish implements the universal chess interface (UCI) to exchange information. For further information see https://github.com/official-stockfish/Stockfish#readme or the corresponding README.md and Copying.txt files distributed with this program. ``` The idea is to provide a minimal help that links to the README.md file, not replicating information that is already available elsewhere. We use this opportunity to explicitly report the license as well. closes https://github.com/official-stockfish/Stockfish/pull/4027 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: Giacomo Lorenzetti
Date: Sun May 29 18:42:48 2022 +0200 Timestamp: 1653842568 Assorted small cleanups closes https://github.com/official-stockfish/Stockfish/pull/3973 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: candirufish
Date: Sat May 21 12:42:33 2022 +0200 Timestamp: 1653129753 Simplify a condition Principal variation depth late move reduction extension simplification. stc: https://tests.stockfishchess.org/tests/view/6285a1d19d18a78568e7fa24 LLR: 2.94 (-2.94,2.94) <-2.25,0.25> Total: 428536 W: 113433 L: 113851 D: 201252 Elo -0.34 Ptnml(0-2): 1671, 48606, 114090, 48272, 1629 ltc: https://tests.stockfishchess.org/tests/view/62871d20375cdc5de8cf5db3 LLR: 2.95 (-2.94,2.94) <-2.25,0.25> Total: 56792 W: 15123 L: 15011 D: 26658 Elo +0.69 Ptnml(0-2): 42, 5681, 16825, 5819, 29 closes https://github.com/official-stockfish/Stockfish/pull/4028 bench: 6501437 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: xoto10
Date: Sun May 15 20:20:37 2022 +0200 Timestamp: 1652638837 Tune scale and optimism. Tune scale and optimism in effort to make stockfish play more aggressively. STC @ 10+0.1 th 1: LLR: 2.94 (-2.94,2.94) <0.00,2.50> Total: 27896 W: 7506 L: 7248 D: 13142 Elo +3.21 Ptnml(0-2): 103, 3047, 7388, 3309, 101 https://tests.stockfishchess.org/tests/live_elo/627fd0cfab44257388ab1f13 LTC @ 60+0.6 th 1: LLR: 2.93 (-2.94,2.94) <0.50,3.00> Total: 65576 W: 17512 L: 17178 D: 30886 Elo +1.77 Ptnml(0-2): 37, 6397, 19587, 6729, 38 https://tests.stockfishchess.org/tests/live_elo/627ff666ab44257388ab256d closes https://github.com/official-stockfish/Stockfish/pull/4025 Bench 6407734 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 May 14 13:17:35 2022 +0200 Timestamp: 1652527055 SE depth scaling using the previous depth This patch makes the SE depth condition more robust and allows it to scale with completed depth from a previous search. At long TC this patch is almost equivalent to https://github.com/official-stockfish/Stockfish/pull/4016 which had VLTC: https://tests.stockfishchess.org/tests/view/626abd7e8707aa698c0093a8 Elo: 2.35 +-1.5 (95%) LOS: 99.9% Total: 40000 W: 10991 L: 10720 D: 18289 Elo +2.35 Ptnml(0-2): 8, 3534, 12648, 3799, 11 nElo: 5.47 +-3.4 (95%) PairsRatio: 1.08 VLTC multicore: https://tests.stockfishchess.org/tests/view/6272a6afc8f14123163c1997 LLR: 2.94 (-2.94,2.94) <0.50,3.00> Total: 86808 W: 24165 L: 23814 D: 38829 Elo +1.40 Ptnml(0-2): 11, 7253, 28524, 7606, 10 however, it is now also gaining at LTC: LTC: https://tests.stockfishchess.org/tests/view/627e7cb523c0c72a05b651a9 LLR: 2.94 (-2.94,2.94) <0.50,3.00> Total: 27064 W: 7285 L: 7046 D: 12733 Elo +3.07 Ptnml(0-2): 8, 2446, 8390, 2675, 13 and should have nearly no influence at STC as depth 27 is rarely reached. It was noticed that initializing the threshold with MAX_PLY, had an adverse effect, possibly because the first move is sensitive to this. closes https://github.com/official-stockfish/Stockfish/pull/4021 closes https://github.com/official-stockfish/Stockfish/pull/4016 Bench: 6481017 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 for modern computers Windows x64 + SSSE3 Windows x64 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64 | Author: Tomasz Sobczyk
Date: Sat May 14 12:47:22 2022 +0200 Timestamp: 1652525242 Update NNUE architecture to SFNNv5. Update network to nn-3c0aa92af1da.nnue. Architecture changes: Duplicated activation after the 1024->15 layer with squared crelu (so 15->15*2). As proposed by vondele. Trainer changes: Added bias to L1 factorization, which was previously missing (no measurable improvement but at least neutral in principle) For retraining linearly reduce lambda parameter from 1.0 at epoch 0 to 0.75 at epoch 800. reduce max_skipping_rate from 15 to 10 (compared to vondele's outstanding PR) Note: This network was trained with a ~0.8% error in quantization regarding the newly added activation function. This will be fixed in the released trainer version. Expect a trainer PR tomorrow. Note: The inference implementation cuts a corner to merge results from two activation functions. This could possibly be resolved nicer in the future. AVX2 implementation likely not necessary, but NEON is missing. First training session invocation: python3 train.py \ ../nnue-pytorch-training/data/nodes5000pv2_UHO.binpack \ ../nnue-pytorch-training/data/nodes5000pv2_UHO.binpack \ --gpus "$3," \ --threads 4 \ --num-workers 8 \ --batch-size 16384 \ --progress_bar_refresh_rate 20 \ --random-fen-skipping 3 \ --features=HalfKAv2_hm^ \ --lambda=1.0 \ --max_epochs=400 \ --default_root_dir ../nnue-pytorch-training/experiment_$1/run_$2 Second training session invocation: python3 train.py \ ../nnue-pytorch-training/data/T60T70wIsRightFarseerT60T74T75T76.binpack \ ../nnue-pytorch-training/data/T60T70wIsRightFarseerT60T74T75T76.binpack \ --gpus "$3," \ --threads 4 \ --num-workers 8 \ --batch-size 16384 \ --progress_bar_refresh_rate 20 \ --random-fen-skipping 3 \ --features=HalfKAv2_hm^ \ --start-lambda=1.0 \ --end-lambda=0.75 \ --gamma=0.995 \ --lr=4.375e-4 \ --max_epochs=800 \ --resume-from-model /data/sopel/nnue/nnue-pytorch-training/data/exp367/nn-exp367-run3-epoch399.pt \ --default_root_dir ../nnue-pytorch-training/experiment_$1/run_$2 Passed STC: LLR: 2.95 (-2.94,2.94) <0.00,2.50> Total: 27288 W: 7445 L: 7178 D: 12665 Elo +3.40 Ptnml(0-2): 159, 3002, 7054, 3271, 158 https://tests.stockfishchess.org/tests/view/627e8c001919125939623644 Passed LTC: LLR: 2.95 (-2.94,2.94) <0.50,3.00> Total: 21792 W: 5969 L: 5727 D: 10096 Elo +3.86 Ptnml(0-2): 25, 2152, 6294, 2406, 19 https://tests.stockfishchess.org/tests/view/627f2a855734b18b2e2ece47 closes https://github.com/official-stockfish/Stockfish/pull/4020 Bench: 6481017 see source |