| !! 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: Joost VandeVondele
Date: Sun Mar 30 13:44:15 2025 +0200 Timestamp: 1743335055 Stockfish 17.1 Official release version of Stockfish 17.1 Bench: 2030154 --- Stockfish 17.1 Today, we have the pleasure to announce Stockfish 17.1. As always, you can **freely** download it at [stockfishchess.org/download][1] and use it in the [GUI of your choice][2]. Join our [Discord server][3] to get in touch with the community of developers and users of the project! Quality of chess play In our testing against its predecessor, Stockfish 17.1 shows a consistent improvement in performance, with an [Elo gain of up to 20 points][4] and winning close to 2 times more game pairs than it loses. Update highlights New speedtest command The new `speedtest` command benchmarks your computer's performance (measured in nodes per second) using a realistic and stable test. To run it, you'll need [command line access][5]—give it a try and share your results with the community! Improved hardware support Stockfish is [no longer limited to 1024 threads][6] and will allow users to specify whatever their system is capable of. Additionally, hardware such as ppc64 and Loongson is now better supported at build time. Bug fixes for tablebase support Our previous release introduced improved engine lines (principal variations) ending in mate as soon as a mate score is announced. A side effect of this improvement was a [rare corner case][7] involving cursed tablebase wins, only relevant in correspondence chess when the 50-move rule does not apply, which has now been fixed. Relatedly, [time management][8] has also been improved to avoid potential time losses. Shoutouts Download page redesign We've redesigned the [download page][1] to address unclear wording and simplify a previously cluttered experience. The page now features a modernized layout, streamlined navigation, and clearer guidance to help you select the right binary for your system. Fishtest framework Our testing framework has been improved in various ways, both on the worker side, including the adoption of [Fastchess][9] as a new game manager, and on the server side, such as streamlined configuration. The reliable availability of testing resources is key for the progress of the engine. Thank you The Stockfish project builds on a thriving community of enthusiasts (thanks everybody!) who contribute their expertise, time, and resources to build a free and open-source chess engine that is robust, widely available, and very strong. We would like to express our gratitude for the [12k stars][10] that light up our GitHub project! Thank you for your support and encouragement – your recognition means a lot to us. We invite our chess fans to [join the Fishtest testing framework][11] to contribute compute resources needed for development. Programmers can contribute to the project either directly to [Stockfish][12] (C++), to [Fishtest][13] (HTML, CSS, JavaScript, and Python), to our trainer [nnue-pytorch][14] (C++ and Python), or to our [website][15] (HTML, CSS/SCSS, and JavaScript). The Stockfish team [1]: https://stockfishchess.org/download [2]: https://official-stockfish.github.io/docs/stockfish-wiki/Download-and-usage.html#download-a-chess-gui [3]: https://discord.gg/GWDRS3kU6R [4]: https://tests.stockfishchess.org/tests/view/67e7d2fd6682f97da2178fbd [5]: https://official-stockfish.github.io/docs/stockfish-wiki/UCI-&-Commands.html#speedtest [6]: https://github.com/official-stockfish/Stockfish/commit/652a8874b523360a3b19c5003c8ba9894ac54d0f [7]: https://github.com/official-stockfish/Stockfish/commit/6c7c5c7e471c16f14518229428e51a3e00c0f1dd [8]: https://github.com/official-stockfish/Stockfish/commit/0f9ae0d11cd034288a49ef3892c580dfed025091 [9]: https://github.com/Disservin/fastchess [10]: https://github.com/official-stockfish/Stockfish/stargazers [11]: https://official-stockfish.github.io/docs/fishtest-wiki/Running-the-Worker.html [12]: https://github.com/official-stockfish/Stockfish [13]: https://github.com/official-stockfish/fishtest [14]: https://github.com/official-stockfish/nnue-pytorch [15]: https://github.com/official-stockfish/stockfish-web see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 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 Mar 29 11:55:55 2025 +0100 Timestamp: 1743245755 Silence "may be used uninitialized" GCC warning Helps gcc silence the warning about ``` warning: 'added' may be used uninitialized [-Wmaybe-uninitialized] const IndexType offsetA0 = TransformedFeatureDimensions * added[0]; ``` closes https://github.com/official-stockfish/Stockfish/pull/5950 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: Sat Mar 29 11:54:32 2025 +0100 Timestamp: 1743245672 Update the WDL model This PR updates the internal WDL model, using data from 2.6M games played by the revisions since f3bfce353168b03e4fedce515de1898c691f81ec. Note that the normalizing constant increases only moderately from 372 to 377. ``` > ./updateWDL.sh --firstrev f3bfce353168b03e4fedce515de1898c691f81ec Running: ./updateWDL.sh --firstrev f3bfce353168b03e4fedce515de1898c691f81ec --lasttrev HEAD --materialMin 17 --EloDiffMax 5 started at: Sat 22 Mar 11:02:14 CET 2025 Look recursively in directory pgns for games with max nElo difference 5 using books matching "UHO_Lichess_4852_v..epd" for SF revisions between f3bfce353168b03e4fedce515de1898c691f81ec (from 2025-02-28 09:50:59 +0100) and HEAD (from 2025-03-21 11:22:59 +0100). Based on 138253430 positions from 2579360 games, NormalizeToPawnValue should change from 372 to 377. ended at: Sat 22 Mar 11:04:00 CET 2025 ``` ``` > cat scoreWDL.log Converting evals with NormalizeData = {'momType': 'material', 'momMin': 17, 'momMax': 78, 'momTarget': 58, 'as': [-37.45051876, 121.19101539, -132.78783573, 420.70576692]}. Reading eval stats from updateWDL.json. Retained (W,D,L) = (33794348, 69943262, 34515820) positions. Saved distribution plot to updateWDLdistro.png. Fit WDL model based on material. Initial objective function: 0.3648260131692729 Final objective function: 0.36482338611818094 Optimization terminated successfully. const int NormalizeToPawnValue = 377; Corresponding spread = 71; Corresponding normalized spread = 0.1879431202530567; Draw rate at 0.0 eval at material 58 = 0.9902694872976331; Parameters in internal value units: p_a = ((-13.500 * x / 58 + 40.928) * x / 58 + -36.828) * x / 58 + 386.830 p_b = ((96.534 * x / 58 + -165.791) * x / 58 + 90.897) * x / 58 + 49.296 constexpr double as[] = {-13.50030198, 40.92780883, -36.82753545, 386.83004070}; constexpr double bs[] = {96.53354896, -165.79058388, 90.89679019, 49.29561889}; Preparing plots. Saved graphics to updateWDL.png. Total elapsed time = 46.92s. ``` Only affects displayed `cp` and `wdl` values. closes https://github.com/official-stockfish/Stockfish/pull/5939 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: Michel Van den Bergh
Date: Sat Mar 29 11:53:53 2025 +0100 Timestamp: 1743245633 Delay check for curl/wget until really needed closes https://github.com/official-stockfish/Stockfish/pull/5938 No functional change see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 for modern computers 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 29 11:52:50 2025 +0100 Timestamp: 1743245570 Update CPU contributors closes https://github.com/official-stockfish/Stockfish/pull/5937 No functional change see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 for modern computers Windows x64 + SSSE3 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64 | Author: mstembera
Date: Fri Mar 21 11:22:59 2025 +0100 Timestamp: 1742552579 Change layout of CorrectionHistory<NonPawn> https://tests.stockfishchess.org/tests/view/67da5b158c7f315cc372a9d2 LLR: 2.95 (-2.94,2.94) <0.00,2.00> Total: 150368 W: 38874 L: 38401 D: 73093 Elo +1.09 Ptnml(0-2): 424, 16821, 40262, 17212, 465 Make CorrectionHistory\<NonPawn\> handle both black and white internally. A follow up to https://github.com/official-stockfish/Stockfish/pull/5816 closes https://github.com/official-stockfish/Stockfish/pull/5934 No functional change see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 for modern computers 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 Mar 21 11:22:25 2025 +0100 Timestamp: 1742552545 Removing the conditional bonus calculation The new value is just a guessed value. Passed STC: https://tests.stockfishchess.org/tests/view/67d5ee09517865b4a2dfd2df LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 52128 W: 13516 L: 13312 D: 25300 Elo +1.36 Ptnml(0-2): 157, 6044, 13451, 6262, 150 Passed LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 42384 W: 10855 L: 10657 D: 20872 Elo +1.62 Ptnml(0-2): 19, 4554, 11852, 4744, 23 https://tests.stockfishchess.org/tests/view/67d5f9d3517865b4a2dfd2ef closes https://github.com/official-stockfish/Stockfish/pull/5933 Bench: 2030154 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: Nonlinear2
Date: Fri Mar 21 11:21:10 2025 +0100 Timestamp: 1742552470 change the bonusScale depth component Passed STC: https://tests.stockfishchess.org/tests/view/67d35f66517865b4a2dfc801 LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 110816 W: 28875 L: 28449 D: 53492 Elo +1.34 Ptnml(0-2): 329, 13064, 28231, 13420, 364 Passed LTC: https://tests.stockfishchess.org/tests/view/67d4bdf0517865b4a2dfd131 LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 121824 W: 31047 L: 30559 D: 60218 Elo +1.39 Ptnml(0-2): 52, 13056, 34214, 13532, 58 closes https://github.com/official-stockfish/Stockfish/pull/5932 Bench: 2128807 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 21 11:19:45 2025 +0100 Timestamp: 1742552385 Simplify captures PCM Passed Non-regression STC: LLR: 2.92 (-2.94,2.94) <-1.75,0.25> Total: 229856 W: 59258 L: 59252 D: 111346 Elo +0.01 Ptnml(0-2): 746, 27330, 58714, 27448, 690 https://tests.stockfishchess.org/tests/view/67d3fdac517865b4a2dfcef4 Passed Non-regression LTC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 107652 W: 27470 L: 27338 D: 52844 Elo +0.43 Ptnml(0-2): 56, 11646, 30280, 11798, 46 https://tests.stockfishchess.org/tests/view/67d5f972517865b4a2dfd2ec closes https://github.com/official-stockfish/Stockfish/pull/5931 Bench: 1842520 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 21 11:19:09 2025 +0100 Timestamp: 1742552349 Use slightly different formula for stat score when position is in check Use formula that is closer to movepicker one. Passed STC: https://tests.stockfishchess.org/tests/view/67cffb337be98c1ad9b021ee LLR: 2.99 (-2.94,2.94) <0.00,2.00> Total: 250432 W: 64978 L: 64343 D: 121111 Elo +0.88 Ptnml(0-2): 795, 29390, 64159, 30129, 743 Passed LTC: https://tests.stockfishchess.org/tests/view/67d3905d517865b4a2dfce8a LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 140004 W: 35742 L: 35215 D: 69047 Elo +1.31 Ptnml(0-2): 60, 15111, 39151, 15602, 78 closes https://github.com/official-stockfish/Stockfish/pull/5930 Bench: 2147336 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 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 Mar 21 11:17:59 2025 +0100 Timestamp: 1742552279 Allow more than 1024 threads on high-end machines closes https://github.com/official-stockfish/Stockfish/pull/5929 No functional change see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 for modern computers Windows x64 + SSSE3 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 Mar 21 11:16:27 2025 +0100 Timestamp: 1742552187 Removing contHist[1] from pruning formula Passed STC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 51552 W: 13297 L: 13091 D: 25164 Elo +1.39 Ptnml(0-2): 166, 6009, 13215, 6225, 161 https://tests.stockfishchess.org/tests/view/67c4de79685e87e15e7c43f5 Passed LTC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 244554 W: 62135 L: 62142 D: 120277 Elo -0.01 Ptnml(0-2): 137, 26612, 68794, 26589, 145 https://tests.stockfishchess.org/tests/view/67c50982685e87e15e7c443d closes https://github.com/official-stockfish/Stockfish/pull/5928 Bench: 1980385 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 21 11:12:47 2025 +0100 Timestamp: 1742551967 Refactor accumulator storage/updates Passed Non-regression STC: LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 115840 W: 29983 L: 29854 D: 56003 Elo +0.39 Ptnml(0-2): 338, 12990, 31149, 13091, 352 https://tests.stockfishchess.org/tests/view/67d0a044166a3e8781d84223 closes https://github.com/official-stockfish/Stockfish/pull/5927 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 21 11:11:12 2025 +0100 Timestamp: 1742551872 Simplify Return Value Adjustment Condition Passed Non-regression STC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 82112 W: 21281 L: 21110 D: 39721 Elo +0.72 Ptnml(0-2): 258, 9630, 21112, 9795, 261 https://tests.stockfishchess.org/tests/view/67c42528b7226b5d8a2dd3a0 Passed Non-regression LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 182652 W: 46295 L: 46240 D: 90117 Elo +0.10 Ptnml(0-2): 103, 20025, 51003, 20104, 91 https://tests.stockfishchess.org/tests/view/67c4d56b685e87e15e7c43d8 closes https://github.com/official-stockfish/Stockfish/pull/5925 Bench: 1711791 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: Daniel Monroe
Date: Fri Mar 21 11:09:38 2025 +0100 Timestamp: 1742551778 Simplify condition in futility pruning Passed STC LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 427040 W: 111061 L: 111271 D: 204708 Elo -0.17 Ptnml(0-2): 1709, 48524, 113171, 48500, 1616 https://tests.stockfishchess.org/tests/view/67af01d01a4c73ae1f930ea4 Passed rebased LTC LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 28704 W: 7330 L: 7120 D: 14254 Elo +2.54 Ptnml(0-2): 8, 3000, 8138, 3186, 20 https://tests.stockfishchess.org/tests/view/67ca629a45214989aa0a123e closes https://github.com/official-stockfish/Stockfish/pull/5924 Bench: 2050046 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 for modern computers 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 21 11:09:28 2025 +0100 Timestamp: 1742551768 Add dbg_clear helper function closes https://github.com/official-stockfish/Stockfish/pull/5921 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: Carlos Esparza
Date: Fri Mar 21 11:09:27 2025 +0100 Timestamp: 1742551767 Simplify risk_tolerance + avoid overflow passed simplification STC: LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 73984 W: 19058 L: 18879 D: 36047 Elo +0.84 Ptnml(0-2): 232, 8735, 18866, 8940, 219 https://tests.stockfishchess.org/tests/view/67c269a38200cf1034c9baf9 passed simplification LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 39288 W: 10033 L: 9833 D: 19422 Elo +1.77 Ptnml(0-2): 14, 4168, 11086, 4356, 20 https://tests.stockfishchess.org/tests/view/67c34f8c8200cf1034c9bda1 closes https://github.com/official-stockfish/Stockfish/pull/5919 Bench: 2050046 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 21 11:03:31 2025 +0100 Timestamp: 1742551411 Improve Perft Testing Added #5909 problematic position and chess-library DFRC positions to perft testing. Additional work done by @Disservin to clean up and improve error reporting. closes https://github.com/official-stockfish/Stockfish/pull/5917 No functional change Co-authored-by: disservin <> see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 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 21 11:02:19 2025 +0100 Timestamp: 1742551339 Reapply #5909 This version fixes the logic of `gives_check`, which was identified to be the cause of illegal moves. closes https://github.com/official-stockfish/Stockfish/pull/5914 No functional change Co-authored-by: Robert Nürnberg <> Co-authored-by: gab8192 <> see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 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: xu-shawn
Date: Fri Feb 28 09:50:59 2025 +0100 Timestamp: 1740732659 Revert "Replace aligned() function with line_bb() and simplify king piece detection" (#5915) closes https://github.com/official-stockfish/Stockfish/pull/5915 No functional change Co-authored-by: Robert Nürnberg <> 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 Feb 27 20:40:56 2025 +0100 Timestamp: 1740685256 VVLTC Search Tune Passed VVLTC with STC bounds: LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 15788 W: 4106 L: 3868 D: 7814 Elo +5.24 Ptnml(0-2): 0, 1324, 5009, 1560, 1 https://tests.stockfishchess.org/tests/view/67bf2ddd6e569f6234102ade Passed VVLTC with LTC bounds: LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 13622 W: 3620 L: 3368 D: 6634 Elo +6.43 Ptnml(0-2): 3, 1190, 4170, 1448, 0 https://tests.stockfishchess.org/tests/view/67c04308c8f7c4c0632d8055 closes https://github.com/official-stockfish/Stockfish/pull/5910 Bench: 1823605 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: Jake Senne
Date: Thu Feb 27 20:38:03 2025 +0100 Timestamp: 1740685083 Replace aligned() function with line_bb() and simplify king piece detection From https://discord.com/channels/435943710472011776/813919248455827515/1342267241168900228 Saves 6 instructions closes https://github.com/official-stockfish/Stockfish/pull/5909 No functional change see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 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 Feb 27 20:34:49 2025 +0100 Timestamp: 1740684889 Remove two unnecessary divisions Passed STC: LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 280768 W: 72187 L: 72236 D: 136345 Elo -0.06 Ptnml(0-2): 815, 33131, 72550, 33064, 824 https://tests.stockfishchess.org/tests/view/67bcf7afe670525923b8a101 Passed LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 108684 W: 27666 L: 27536 D: 53482 Elo +0.42 Ptnml(0-2): 40, 11768, 30606, 11878, 50 https://tests.stockfishchess.org/tests/view/67be472ed8d5c2c657c52cb8 closes https://github.com/official-stockfish/Stockfish/pull/5908 Bench: 2400689 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 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: Thu Feb 27 20:31:04 2025 +0100 Timestamp: 1740684664 Simplify NMP Conditions Passed Non-regression STC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 142400 W: 36883 L: 36779 D: 68738 Elo +0.25 Ptnml(0-2): 467, 16804, 36571, 16874, 484 https://tests.stockfishchess.org/tests/view/67bd1898e4a8d7152b974ef1 Passed Non-regression LTC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 251868 W: 63905 L: 63920 D: 124043 Elo -0.02 Ptnml(0-2): 133, 27480, 70708, 27495, 118 https://tests.stockfishchess.org/tests/view/67bd1898e4a8d7152b974ef1 closes https://github.com/official-stockfish/Stockfish/pull/5906 Bench: 2188400 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 Feb 27 20:30:44 2025 +0100 Timestamp: 1740684644 Combine last 3 add/remove operations https://tests.stockfishchess.org/tests/view/67ad587052879dfd14d7e8a5 LLR: 2.95 (-2.94,2.94) <0.00,2.00> Total: 45856 W: 12177 L: 11855 D: 21824 Elo +2.44 Ptnml(0-2): 176, 4845, 12588, 5119, 200 The two most common cases are when added and removed counts are equal and when they are off by 1. When they are off by 1 we currently do a pass combining 2 and then an extra pass for the last 1. This patch does a single combined pass on the final 3 instead. Tested on top of the simplification in https://github.com/official-stockfish/Stockfish/pull/5901 closes https://github.com/official-stockfish/Stockfish/pull/5902 No functional change see source |