| 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: RainRat
Date: Thu Jan 4 15:51:56 2024 +0100 Timestamp: 1704379916 Fix typo in tbprobe.cpp closes https://github.com/official-stockfish/Stockfish/pull/4959 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: Thu Jan 4 15:51:04 2024 +0100 Timestamp: 1704379864 Change the Move enum to a class This changes the Move enum to a class, this way all move related functions can be moved into the class and be more self contained. closes https://github.com/official-stockfish/Stockfish/pull/4958 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: Viren6
Date: Thu Jan 4 15:49:33 2024 +0100 Timestamp: 1704379773 Modify ttPV reduction This patch modifies ttPV reduction by reducing 1 more unless ttValue is above alpha. Inspired from @pb00068 https://tests.stockfishchess.org/tests/view/658060796a3b4f6202215f1f Passed STC: https://tests.stockfishchess.org/tests/view/6591867679aa8af82b958328 LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 37856 W: 9727 L: 9407 D: 18722 Elo +2.94 Ptnml(0-2): 99, 4444, 9568, 4672, 145 Passed LTC: https://tests.stockfishchess.org/tests/view/6591d9b679aa8af82b958a6c LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 128256 W: 32152 L: 31639 D: 64465 Elo +1.39 Ptnml(0-2): 64, 14364, 34772, 14851, 77 closes https://github.com/official-stockfish/Stockfish/pull/4957 Bench: 1176235 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: Thu Jan 4 15:47:37 2024 +0100 Timestamp: 1704379657 Simplification of partial_insertion_sort formula. Passed STC: https://tests.stockfishchess.org/tests/view/6590110879aa8af82b9562e9 LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 134880 W: 34468 L: 34355 D: 66057 Elo +0.29 Ptnml(0-2): 476, 16060, 34220, 16243, 441 Passed LTC: https://tests.stockfishchess.org/tests/view/659156ca79aa8af82b957f07 LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 60780 W: 15179 L: 14996 D: 30605 Elo +1.05 Ptnml(0-2): 27, 6847, 16464, 7020, 32 closes https://github.com/official-stockfish/Stockfish/pull/4955 Bench: 1338331 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 Jan 4 15:47:10 2024 +0100 Timestamp: 1704379630 Update copyright year closes https://github.com/official-stockfish/Stockfish/pull/4954 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: Thu Jan 4 15:45:33 2024 +0100 Timestamp: 1704379533 Silence security alert warning about possible infinite loop As some have noticed, a security alert has been complaining about a for loop in our TB code for quite some now. Though it was never a real issue, so not of high importance. A few lines earlier the symlen vector is resized `d->symlen.resize(number<uint16_t, LittleEndian>(data));` while this code seems odd at first, it resizes the array to at most (2 << 16) - 1 elements, basically making the infinite loop issue impossible to occur. closes https://github.com/official-stockfish/Stockfish/pull/4953 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: Joseph Huang
Date: Thu Jan 4 15:45:03 2024 +0100 Timestamp: 1704379503 Lower MultiPV max to MAX_MOVES Link max value of MultiPV to that of MAX_MOVES which is 256 closes https://github.com/official-stockfish/Stockfish/pull/4951 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: Mon Jan 1 02:31:25 2024 +0100 Timestamp: 1704072685 Fix formatting in search.cpp fixes the formatting for 1fe562fdf32c153f82929660197f8b97469f76b4 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: Sun Dec 31 20:09:09 2023 +0100 Timestamp: 1704049749 Tweak static eval history update Modify the applied static eval bonus for main and pawn history with different factors for positive and negative values. Passed STC: https://tests.stockfishchess.org/tests/view/659132e179aa8af82b957bb0 LLR: 2.93 (-2.94,2.94) <0.00,2.00> Total: 12512 W: 3308 L: 3027 D: 6177 Elo +7.80 Ptnml(0-2): 32, 1372, 3189, 1609, 54 Passed LTC: https://tests.stockfishchess.org/tests/view/65913e3d79aa8af82b957cd2 LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 35946 W: 9128 L: 8809 D: 18009 Elo +3.08 Ptnml(0-2): 19, 3879, 9862, 4190, 23 closes https://github.com/official-stockfish/Stockfish/pull/4952 Bench: 1392883 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: Sun Dec 31 20:00:06 2023 +0100 Timestamp: 1704049206 Introduce static evaluation correction history Idea from Caissa (https://github.com/Witek902/Caissa) chess engine. With given pawn structure collect data with how often search result and by how much it was better / worse than static evalution of position and use it to adjust static evaluation of positions with given pawn structure. Details: 1. excludes positions with fail highs and moves producing it being a capture; 2. update value is function of not only difference between best value and static evaluation but also is multiplied by linear function of depth; 3. maximum update value is maximum value of correction history divided by 2; 4. correction history itself is divided by 32 when applied so maximum value of static evaluation adjustment is 32 internal units. Passed STC: https://tests.stockfishchess.org/tests/view/658fc7b679aa8af82b955cac LLR: 2.96 (-2.94,2.94) <0.00,2.00> Total: 128672 W: 32757 L: 32299 D: 63616 Elo +1.24 Ptnml(0-2): 441, 15241, 32543, 15641, 470 Passed LTC: https://tests.stockfishchess.org/tests/view/65903f6979aa8af82b9566f1 LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 97422 W: 24626 L: 24178 D: 48618 Elo +1.60 Ptnml(0-2): 41, 10837, 26527, 11245, 61 closes https://github.com/official-stockfish/Stockfish/pull/4950 Bench: 1157852 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 Dec 31 19:58:10 2023 +0100 Timestamp: 1704049090 Mark square_bb() as constexpr closes https://github.com/official-stockfish/Stockfish/pull/4949 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: Sun Dec 31 19:57:34 2023 +0100 Timestamp: 1704049054 Simplify the improving flag calculation Passed STC: https://tests.stockfishchess.org/tests/view/658ec29979aa8af82b9547f6 LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 93408 W: 23747 L: 23587 D: 46074 Elo +0.60 Ptnml(0-2): 340, 11178, 23527, 11300, 359 Passed LTC: https://tests.stockfishchess.org/tests/view/658f73e479aa8af82b9555b6 LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 64026 W: 15984 L: 15806 D: 32236 Elo +0.97 Ptnml(0-2): 31, 7113, 17552, 7281, 36 closes https://github.com/official-stockfish/Stockfish/pull/4948 Bench: 1143749 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 Dec 31 19:54:27 2023 +0100 Timestamp: 1704048867 Cleanup comments Tests used to derive some Elo worth comments: https://tests.stockfishchess.org/tests/view/656a7f4e136acbc573555a31 https://tests.stockfishchess.org/tests/view/6585fb455457644dc984620f closes https://github.com/official-stockfish/Stockfish/pull/4945 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: Tobias Steinmann
Date: Sun Dec 31 19:51:04 2023 +0100 Timestamp: 1704048664 Update Makefile for android x86-64 builds For developing an Android GUI it can be helpful to use the Emulator on Windows. Therefor an android_x86-64 library of Stockfish is needed. It would be nice to compile it "out-of-the-box". This change is originally suggested by Craftyawesome closes https://github.com/official-stockfish/Stockfish/pull/4927 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: Shahin M. Shahin
Date: Sat Dec 30 12:19:48 2023 +0100 Timestamp: 1703935188 Fix scores from reverse futility pruning This fixes futility pruning return values after recent tweaks, `eval` is guaranteed to be less than the mate-in range but it can be as low value such that the average between eval and beta can still fall in the mated-in range when beta is as low in mated range. i.e. (eval + beta) / 2 being at mated-range which can break mates. Passed non-regression STC: https://tests.stockfishchess.org/tests/view/658f3eed79aa8af82b955139 LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 117408 W: 29891 L: 29761 D: 57756 Elo +0.38 Ptnml(0-2): 386, 13355, 31120, 13429, 414 Passed non-regression LTC: https://tests.stockfishchess.org/tests/view/658f8b7a79aa8af82b9557bd LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 60240 W: 14962 L: 14786 D: 30492 Elo +1.02 Ptnml(0-2): 22, 6257, 17390, 6425, 26 changes signature at higher depth e.g. `128 1 15` closes https://github.com/official-stockfish/Stockfish/pull/4944 Bench: 1304666 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 Dec 30 11:08:03 2023 +0100 Timestamp: 1703930883 Update default net to nn-b1e55edbea57.nnue Created by retraining the master big net `nn-0000000000a0.nnue` on the same dataset with the ranger21 optimizer and more WDL skipping at training time. More WDL skipping is meant to increase lambda accuracy and train on fewer misevaluated positions where position scores are unlikely to correlate with game outcomes. Inspired by: - repeated reports in discord #events-discuss about SF misplaying due to wrong endgame evals, possibly due to Leela's endgame weaknesses reflected in training data - an attempt to reduce the skewed dataset piece count distribution where there are much more positions with less than 16 pieces, since the target piece count distribution in the trainer is symmetric around 16 The faster convergence seen with ranger21 is meant to: - prune experiment ideas more quickly since fewer epochs are needed to reach elo maxima - research faster potential trainings by shortening each run ```yaml experiment-name: 2560-S7-Re-514G-ranger21-more-wdl-skip training-dataset: /data/S6-514G.binpack early-fen-skipping: 28 start-from-engine-test-net: True nnue-pytorch-branch: linrock/nnue-pytorch/r21-more-wdl-skip num-epochs: 1200 lr: 4.375e-4 gamma: 0.995 start-lambda: 1.0 end-lambda: 0.7 ``` Experiment yaml configs converted to easy_train.sh commands with: https://github.com/linrock/nnue-tools/blob/4339954/yaml_easy_train.py Implementations based off of Sopel's NNUE training & experimentation log: https://docs.google.com/document/d/1gTlrr02qSNKiXNZ_SuO4-RjK4MXBiFlLE6jvNqqMkAY - Experiment 336 - ranger21 https://github.com/Sopel97/nnue-pytorch/tree/experiment_336 - Experiment 351 - more WDL skipping The version of the ranger21 optimizer used is: https://github.com/lessw2020/Ranger21/blob/b507df6/ranger21/ranger21.py The dataset is the exact same as in: https://github.com/official-stockfish/Stockfish/pull/4782 Local elo at 25k nodes per move: nn-epoch619.nnue : 6.2 +/- 4.2 Passed STC: https://tests.stockfishchess.org/tests/view/658a029779aa8af82b94fbe6 LLR: 2.93 (-2.94,2.94) <0.00,2.00> Total: 46528 W: 11985 L: 11650 D: 22893 Elo +2.50 Ptnml(0-2): 154, 5489, 11688, 5734, 199 Passed LTC: https://tests.stockfishchess.org/tests/view/658a448979aa8af82b95010f LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 265326 W: 66378 L: 65574 D: 133374 Elo +1.05 Ptnml(0-2): 153, 30175, 71254, 30877, 204 This was additionally tested with the latest DualNNUE and passed SPRTs: Passed STC vs. https://github.com/official-stockfish/Stockfish/pull/4919 https://tests.stockfishchess.org/tests/view/658bcd5c79aa8af82b951846 LLR: 2.93 (-2.94,2.94) <0.00,2.00> Total: 296128 W: 76273 L: 75554 D: 144301 Elo +0.84 Ptnml(0-2): 1223, 35768, 73617, 35979, 1477 Passed LTC vs. https://github.com/official-stockfish/Stockfish/pull/4919 https://tests.stockfishchess.org/tests/view/658c988d79aa8af82b95240f LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 75618 W: 19085 L: 18680 D: 37853 Elo +1.86 Ptnml(0-2): 45, 8420, 20497, 8779, 68 closes https://github.com/official-stockfish/Stockfish/pull/4942 Bench: 1304666 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 Dec 30 11:05:19 2023 +0100 Timestamp: 1703930719 Refactor bestvalue adjustment in qsearch closes https://github.com/official-stockfish/Stockfish/pull/4935 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: Sat Dec 30 11:01:32 2023 +0100 Timestamp: 1703930492 Adjust value returned after TT cutoff Instead of returning value from TT in case of a fail high return mix between it and beta. Passed STC: https://tests.stockfishchess.org/tests/view/658465395457644dc98446c7 LLR: 2.93 (-2.94,2.94) <0.00,2.00> Total: 220704 W: 56404 L: 55811 D: 108489 Elo +0.93 Ptnml(0-2): 750, 26214, 55921, 26627, 840 Passed LTC: https://tests.stockfishchess.org/tests/view/6585c3f55457644dc9845db9 LLR: 2.97 (-2.94,2.94) <0.50,2.50> Total: 124980 W: 31169 L: 30658 D: 63153 Elo +1.42 Ptnml(0-2): 57, 14147, 33603, 14594, 89 closes https://github.com/official-stockfish/Stockfish/pull/4934 Bench: 1191093 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: peregrineshahin
Date: Sat Dec 30 10:57:48 2023 +0100 Timestamp: 1703930268 Fix wrong mate/tb scores from probCut This fixes returning wrong mated-in scores, or losing a proven mate-in score from probCut after recent tweaks. The issue reported by @cj5716 on discord. Passed non-reg STC: https://tests.stockfishchess.org/tests/view/6583c36b5457644dc9843afe LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 295936 W: 75011 L: 75075 D: 145850 Elo -0.08 Ptnml(0-2): 978, 33947, 78146, 33955, 942 Passed non-reg LTC: https://tests.stockfishchess.org/tests/view/658513075457644dc98451cd LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 55932 W: 13970 L: 13786 D: 28176 Elo +1.14 Ptnml(0-2): 33, 5933, 15837, 6143, 20 closes https://github.com/official-stockfish/Stockfish/pull/4933 Bench: 1308739 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 Dec 22 11:51:08 2023 +0100 Timestamp: 1703242268 Tweak quiet move bonus Improving quiet move bonus by replacing bestvalue and alpha comparison, with checking the statScore of the previous search step instead. Inspired by @locutus2 Passed STC: https://tests.stockfishchess.org/tests/view/657f22fb893104ee25b614e8 LLR: 2.96 (-2.94,2.94) <0.00,2.00> Total: 51296 W: 13121 L: 12774 D: 25401 Elo +2.35 Ptnml(0-2): 225, 5986, 12868, 6355, 214 Passed LTC: https://tests.stockfishchess.org/tests/view/658024a2893104ee25b62587 LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 82758 W: 20606 L: 20189 D: 41963 Elo +1.75 Ptnml(0-2): 51, 9149, 22555, 9580, 44 closes https://github.com/official-stockfish/Stockfish/pull/4930 Bench: 1312822 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 Dec 22 11:48:43 2023 +0100 Timestamp: 1703242123 Revert "Adjust stand pat in qsearch on pv nodes" This reverts commit d9ec82e7438716671168d78eee26fae327249e8c. Bench: 1249544 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 Dec 19 18:22:10 2023 +0100 Timestamp: 1703006530 Adjust return value in qsearch after fail high Instead of returning strict fail soft fail high return value between value from search and beta (somewhat by analogy to futility pruning and probcut). This seems to be somewhat depth sensitive heuristic which performed much worse at LTC while performing much better at STC if it is more aggressive, passed version is the least aggressive one. Passed STC: https://tests.stockfishchess.org/tests/view/657b06414d789acf40ab1475 LLR: 2.95 (-2.94,2.94) <0.00,2.00> Total: 212352 W: 53900 L: 53315 D: 105137 Elo +0.96 Ptnml(0-2): 809, 25236, 53520, 25783, 828 Passed LTC: https://tests.stockfishchess.org/tests/view/657ce36f393ac02e79120a7c LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 319362 W: 79541 L: 78630 D: 161191 Elo +0.99 Ptnml(0-2): 202, 35839, 86709, 36708, 223 closes https://github.com/official-stockfish/Stockfish/pull/4928 Bench: 974739 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 for modern computers Windows x64 + SSSE3 Windows x64 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64 | Author: FauziAkram
Date: Tue Dec 19 18:22:10 2023 +0100 Timestamp: 1703006530 Use std::abs over abs closes https://github.com/official-stockfish/Stockfish/pull/4926 closes https://github.com/official-stockfish/Stockfish/pull/4909 No functional change Co-Authored-By: fffelix-huang <72808219+> see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 for modern computers Windows x64 + SSSE3 Windows x64 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64 | Author: FauziAkram
Date: Tue Dec 19 18:22:10 2023 +0100 Timestamp: 1703006530 Improvement of Time Management Parameters Passed STC: https://tests.stockfishchess.org/tests/view/6579c5574d789acf40aaf914 LLR: 2.93 (-2.94,2.94) <0.00,2.00> Total: 44672 W: 11354 L: 11030 D: 22288 Elo +2.52 Ptnml(0-2): 140, 5033, 11685, 5319, 159 Passed LTC: https://tests.stockfishchess.org/tests/view/657ad7f44d789acf40ab105e LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 40932 W: 10275 L: 9950 D: 20707 Elo +2.76 Ptnml(0-2): 21, 4316, 11473, 4629, 27 Passed non-regression Sudden death 10+0: https://tests.stockfishchess.org/tests/view/657b9b9e393ac02e7911f1a8 LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 21384 W: 5171 L: 4925 D: 11288 Elo +4.00 Ptnml(0-2): 112, 2420, 5409, 2612, 139 closes https://github.com/official-stockfish/Stockfish/pull/4923 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 Dec 19 18:22:10 2023 +0100 Timestamp: 1703006530 Adjust stand pat in qsearch on pv nodes Instead of immediately returning a fail high do this only at non-pv nodes, for pv nodes adjust bestValue to value between alpha and beta and continue searching. Idea is to do it the same way as it's done in search where we don't return positive beta cutoffs after ttHits / zero window search at PvNodes and instead fully search lines. Passed STC: https://tests.stockfishchess.org/tests/view/65739b0af09ce1261f122f33 LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 189216 W: 48142 L: 47598 D: 93476 Elo +1.00 Ptnml(0-2): 584, 22463, 48051, 22845, 665 Passed LTC: https://tests.stockfishchess.org/tests/view/657701214d789acf40aac194 LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 82506 W: 20689 L: 20269 D: 41548 Elo +1.77 Ptnml(0-2): 56, 9236, 22268, 9618, 75 Two issues had to be resolved: - in rare cases it set alpha to the same value as beta and thus broke some asserts; - messed up with returning tb win values. Fix passed non-regression LTC vs this patch: https://tests.stockfishchess.org/tests/view/6578113b4d789acf40aad544 LLR: 2.96 (-2.94,2.94) <-1.75,0.25> Total: 277308 W: 68839 L: 68880 D: 139589 Elo -0.05 Ptnml(0-2): 167, 31580, 75212, 31517, 178 closes https://github.com/official-stockfish/Stockfish/pull/4922 Bench: 1069503 Co-Authored-By: Muzhen Gaming <61100393+> Co-Authored-By: Shahin M. Shahin <41402573+> Co-Authored-By: fffelix-huang <72808219+> see source |