| !! latest version !! Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 for modern computers Windows x64 + SSSE3 Windows x64 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64 | Author: cj5716
Date: Sun Apr 21 14:50:04 2024 +0200 Timestamp: 1713703804 Tweak TT aging and replacement strategies We change the definition of "age" from "age of this position" to "age of this TT entry". In this way, despite being on the same position, when we save into TT, we always prefer the new entry as compared to the old one. Passed STC: LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 152256 W: 39597 L: 39110 D: 73549 Elo +1.11 Ptnml(0-2): 556, 17562, 39398, 18063, 549 https://tests.stockfishchess.org/tests/view/6620faee3fe04ce4cefbf215 Passed LTC: LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 51564 W: 13242 L: 12895 D: 25427 Elo +2.34 Ptnml(0-2): 24, 5464, 14463, 5803, 28 https://tests.stockfishchess.org/tests/view/66231ab53fe04ce4cefc153e closes #5184 Bench 1479416 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: Sun Apr 21 14:49:11 2024 +0200 Timestamp: 1713703751 Move ALSR change to CI Workflow file It makes more sense to not (potentially) change the developers alsr entropy setting to make the test run through. This should be an active choice even if the test then might fail locally for them. closes https://github.com/official-stockfish/Stockfish/pull/5182 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 Apr 21 14:46:01 2024 +0200 Timestamp: 1713703561 Improve CI the recent refactoring has shown some limitations of our testing, hence we add a couple of more tests including: * expected mate score * expected mated score * expected in TB win score * expected in TB loss score * expected info line output * expected info line output (wdl) closes https://github.com/official-stockfish/Stockfish/pull/5181 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: Robert Nurnberg @ elitebook
Date: Sun Apr 21 14:40:02 2024 +0200 Timestamp: 1713703202 update the WDL model The patch only changes the displayed cp and wdl values. closes https://github.com/official-stockfish/Stockfish/pull/5178 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: Gahtan Nahdi
Date: Sun Apr 21 14:38:16 2024 +0200 Timestamp: 1713703096 fix clang compiler warning for avx512 build Initialize variable in constexpr function to get rid of clang compiler warning for avx512 build. closes https://github.com/official-stockfish/Stockfish/pull/5176 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: Michael Chaly
Date: Sun Apr 21 14:35:54 2024 +0200 Timestamp: 1713702954 Trivial cleanup Make naming and declaration of futilityValue in search consistent between different places. closes https://github.com/official-stockfish/Stockfish/pull/5165 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: Sun Apr 21 14:35:01 2024 +0200 Timestamp: 1713702901 Refactor elapsed time checks in search Small improvement of the elapsed time usage in search, makes the code easier to read overall. Also Search::Worker::iterative_deepening() now only checks the elapsed time once, instead of 3 times in a row. Non Regression STC: https://tests.stockfishchess.org/tests/view/6617005d5a4693796d965c3c LLR: 2.97 (-2.94,2.94) <-1.75,0.25> Total: 61024 W: 16002 L: 15806 D: 29216 Elo +1.12 Ptnml(0-2): 243, 6874, 16102, 7030, 263 closes https://github.com/official-stockfish/Stockfish/pull/5163 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: Sun Apr 21 14:32:26 2024 +0200 Timestamp: 1713702746 Update outdated comments closes https://github.com/official-stockfish/Stockfish/pull/5158 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 Apr 13 22:05:19 2024 +0200 Timestamp: 1713038719 Fix wrong sign for 200 TB score Fix another case of 9032c6cbe74ccf7e8963755501e7e6cc473ae471 * TB values can have a distance of 0, mainly when we are in a tb position but haven't found mate. * Add a missing whitespace to UCIEngine::on_update_no_moves() Closes https://github.com/official-stockfish/Stockfish/pull/5172 No functional change see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 for modern computers Windows x64 + SSSE3 Windows x64 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64 | Author: Disservin
Date: Fri Apr 12 19:37:39 2024 +0200 Timestamp: 1712943459 Remove duplicated Position object in UCIEngine Also fixes searchmoves. Drop the need of a Position object in uci.cpp. A side note, it is still required for the static functions, but these should be moved to a different namespace/class later on, since sf kinda relies on them. closes https://github.com/official-stockfish/Stockfish/pull/5169 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: Fri Apr 12 18:11:54 2024 +0200 Timestamp: 1712938314 Fix some more UCI output further fall-out of the refactoring, fixes: * the position object in UCI is not never getting updated if position token is used * duplicate string of " wdl " See also: https://discord.com/channels/435943710472011776/1032922913499783169/1228227522945351690 https://discord.com/channels/435943710472011776/813919248455827515/1228288106449338398 closes https://github.com/official-stockfish/Stockfish/pull/5168 No functional change Co-Authored-By: disservin <45608332+> 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: Robert Nurnberg @ elitebook
Date: Fri Apr 12 09:30:34 2024 +0200 Timestamp: 1712907034 Fix wrong mate sign introduced yesterday by the UCI refactoring 9032c6cbe fixes #5166 closes https://github.com/official-stockfish/Stockfish/pull/5167 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: Thu Apr 11 22:47:40 2024 +0200 Timestamp: 1712868460 Simplify the depth-dependent part of the best value adjustment formula in main search Passed STC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 139648 W: 36171 L: 36061 D: 67416 Elo +0.27 Ptnml(0-2): 545, 16685, 35282, 16739, 573 https://tests.stockfishchess.org/tests/view/660d953b8ff4a059828d625d Passed LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 222894 W: 56519 L: 56505 D: 109870 Elo +0.02 Ptnml(0-2): 112, 25145, 60971, 25055, 164 https://tests.stockfishchess.org/tests/view/660fd4afbfeb43334bf7d558 closes https://github.com/official-stockfish/Stockfish/pull/5164 bench: 1479416 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: gab8192
Date: Thu Apr 11 22:43:00 2024 +0200 Timestamp: 1712868180 Remove an useless assignment The assignment (ss + 1)->excludedMove = Move::none() can be simplified away because when that line is reached, (ss + 1)->excludedMove is always already none. The only moment stack[x]->excludedMove is modified, is during singular search, but it is reset to none right after the singular search is finished. closes https://github.com/official-stockfish/Stockfish/pull/5153 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 Apr 11 22:41:35 2024 +0200 Timestamp: 1712868095 Remove COMPILER from Makefile The same functionality is available by using COMPCXX and having another variable which does the same is just confusing. There was only one mention on Stockfish Wiki about this which has been changed to COMPCXX. closes https://github.com/official-stockfish/Stockfish/pull/5154 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: mstembera
Date: Thu Apr 11 22:38:38 2024 +0200 Timestamp: 1712867918 Avoid permuting inputs during transform() Avoid permuting inputs during transform() and instead do it once at load time. Affects AVX2 and newer Intel architectures only. https://tests.stockfishchess.org/tests/view/661306613eb00c8ccc0033c7 LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 108480 W: 28319 L: 27898 D: 52263 Elo +1.35 Ptnml(0-2): 436, 12259, 28438, 12662, 445 speedups measured such as e.g. ``` Result of 100 runs ================== base (./stockfish.master ) = 1241128 +/- 3757 test (./stockfish.patch ) = 1247713 +/- 3689 diff = +6585 +/- 2583 speedup = +0.0053 P(speedup > 0) = 1.0000 ``` closes https://github.com/official-stockfish/Stockfish/pull/5160 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 Apr 11 22:23:52 2024 +0200 Timestamp: 1712867032 VVLTC search tune Parameters were tuned in 3 stages: * Using an earlier L1-3072 net, and with triple extension margin manually set to 0: https://tests.stockfishchess.org/tests/view/65ffdf5d0ec64f0526c544f2 (~30k games) * Continue tuning, but with the previous master net (L1-2560). https://tests.stockfishchess.org/tests/view/660663f00ec64f0526c59c41 (~27k games) * Starting with the parameters from step 2, use the current L1-3072 net, and allow the triple extension margin to be tuned starting from 0: https://tests.stockfishchess.org/tests/view/660c16b8216a13d9498e7536 (40k games) Passed VVLTC 1st sprt: https://tests.stockfishchess.org/tests/view/66115eacbfeb43334bf7eddd LLR: 2.95 (-2.94,2.94) <0.00,2.00> Total: 27138 W: 7045 L: 6789 D: 13304 Elo +3.28 Ptnml(0-2): 1, 2421, 8471, 2673, 3 Passed VVLTC 2nd sprt: https://tests.stockfishchess.org/tests/view/661483623eb00c8ccc0049c1 LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 26242 W: 6807 L: 6535 D: 12900 Elo +3.60 Ptnml(0-2): 0, 2353, 8143, 2625, 0 STC Elo estimate: https://tests.stockfishchess.org/tests/view/66175ca55a4693796d96608c Elo: -10.53 ± 2.4 (95%) LOS: 0.0% Total: 21584 W: 5294 L: 5948 D: 10342 Elo -10.53 Ptnml(0-2): 102, 2937, 5363, 2293, 97 nElo: -19.99 ± 4.7 (95%) PairsRatio: 0.79 closes https://github.com/official-stockfish/Stockfish/pull/5162 Bench: 1381387 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 Apr 5 21:03:58 2024 +0200 Timestamp: 1712343838 Transform search output to engine callbacks Part 2 of the Split UCI into UCIEngine and Engine refactor. This creates function callbacks for search to use when an update should occur. The benching in uci.cpp for example does this to extract the total nodes searched. 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 Apr 4 00:15:17 2024 +0200 Timestamp: 1712182517 Split UCI into UCIEngine and Engine This is another refactor which aims to decouple uci from stockfish. A new engine class manages all engine related logic and uci is a "small" wrapper around it. In the future we should also try to remove the need for the Position object in the uci and replace the options with an actual options struct instead of using a map. Also convert the std::string's in the Info structs a string_view. closes #5147 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: Tue Apr 2 08:49:48 2024 +0200 Timestamp: 1712040588 Update NNUE architecture to SFNNv9 and net nn-ae6a388e4a1a.nnue Part 1: PyTorch Training, linrock Trained with a 10-stage sequence from scratch, starting in May 2023: https://github.com/linrock/nnue-tools/blob/master/exp-sequences/3072-10stage-SFNNv9.yml While the training methods were similar to the L1-2560 training sequence, the last two stages introduced min-v2 binpacks, where bestmove capture and in-check position scores were not zeroed during minimization, for compatibility with skipping SEE >= 0 positions and future research. Training data can be found at: https://robotmoon.com/nnue-training-data This net was tested at epoch 679 of the 10th training stage: https://tests.stockfishchess.org/tests/view/65f32e460ec64f0526c48dbc Part 2: SPSA Training, Viren6 The net was then SPSA tuned. This consisted of the output weights (32 * 8) and biases (8) as well as the L3 biases (32 * 8) and L2 biases (16 * 8), totalling 648 params in total. The SPSA tune can be found here: https://tests.stockfishchess.org/tests/view/65fc33ba0ec64f0526c512e3 With the help of Disservin , the initial weights were extracted with: https://github.com/Viren6/Stockfish/tree/new228 The net was saved with the tuned weights using: https://github.com/Viren6/Stockfish/tree/new241 Earlier nets of the SPSA failed STC compared to the base 3072 net of part 1: https://tests.stockfishchess.org/tests/view/65ff356e0ec64f0526c53c98 Therefore it is suspected that the SPSA at VVLTC has added extra scaling on top of the scaling of increasing the L1 size. Passed VVLTC 1: https://tests.stockfishchess.org/tests/view/6604a9020ec64f0526c583da LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 53042 W: 13554 L: 13256 D: 26232 Elo +1.95 Ptnml(0-2): 12, 5147, 15903, 5449, 10 Passed VVLTC 2: https://tests.stockfishchess.org/tests/view/660ad1b60ec64f0526c5dd23 LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 17506 W: 4574 L: 4315 D: 8617 Elo +5.14 Ptnml(0-2): 1, 1567, 5362, 1818, 5 STC Elo estimate: https://tests.stockfishchess.org/tests/view/660b834d01aaec5069f87cb0 Elo: -7.66 ± 3.8 (95%) LOS: 0.0% Total: 9618 W: 2440 L: 2652 D: 4526 Elo -7.66 Ptnml(0-2): 80, 1281, 2261, 1145, 42 nElo: -13.94 ± 6.9 (95%) PairsRatio: 0.87 closes https://tests.stockfishchess.org/tests/view/660b834d01aaec5069f87cb0 bench 1823302 Co-Authored-By: Linmiao Xu <> 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: Sat Mar 30 12:38:02 2024 +0100 Timestamp: 1711798682 Avoid a note related to an ABI change current master triggers a gcc note: parameter passing for argument of type 'std::pair<double, double>' when C++17 is enabled changed to match C++14 in GCC 10.1 while this is inconsequential, and just informative https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111516 we can easily avoid it. closes https://github.com/official-stockfish/Stockfish/pull/5145 No functional change see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 for modern computers Windows x64 + SSSE3 Windows x64 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64 | Author: Disservin
Date: Fri Mar 29 13:13:07 2024 +0100 Timestamp: 1711714387 Improve prerelease creation workflow In the last couple of months we sometimes saw duplicated prereleases uploaded to GitHub, possibly due to some racy behavior when concurrent jobs create a prerelease. This now creates an empty prerelease at the beginning of the CI and the binaries are later just attached to this one. closes https://github.com/official-stockfish/Stockfish/pull/5144 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: Fri Mar 29 13:12:20 2024 +0100 Timestamp: 1711714340 Fix usage of abs vs std::abs close https://github.com/official-stockfish/Stockfish/pull/5143 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: Shawn Xu
Date: Fri Mar 29 10:18:40 2024 +0100 Timestamp: 1711703920 Simplify NMP Condition Remove eval >= ss->staticEval condition for Null Move Pruning. Passed non-regression STC: LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 44000 W: 11420 L: 11202 D: 21378 Elo +1.72 Ptnml(0-2): 174, 5243, 10978, 5401, 204 https://tests.stockfishchess.org/tests/live_elo/6603ee490ec64f0526c57984 Passed non-regression LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 82956 W: 20978 L: 20818 D: 41160 Elo +0.67 Ptnml(0-2): 54, 9353, 22499, 9523, 49 https://tests.stockfishchess.org/tests/live_elo/660464b50ec64f0526c5804d closes https://github.com/official-stockfish/Stockfish/pull/5142 Bench 1759189 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 Mar 29 10:15:17 2024 +0100 Timestamp: 1711703717 Adjust best value after a pruned quiet move Logic somewhat similar to how we adjust best value after pruned captures in qsearch, but in search this patch does it after pruned quiet moves and also to not full scale of futility value but to smth in between best value and futility value. Passed STC: https://tests.stockfishchess.org/tests/view/6601cf900ec64f0526c55c30 LLR: 2.93 (-2.94,2.94) <0.00,2.00> Total: 59936 W: 15722 L: 15369 D: 28845 Elo +2.05 Ptnml(0-2): 182, 7097, 15112, 7340, 237 Passed LTC: https://tests.stockfishchess.org/tests/view/66029b2d0ec64f0526c566f1 LLR: 2.96 (-2.94,2.94) <0.50,2.50> Total: 118362 W: 29953 L: 29460 D: 58949 Elo +1.45 Ptnml(0-2): 68, 13159, 32249, 13622, 83 closes https://github.com/official-stockfish/Stockfish/pull/5141 bench 1772608 see source |