| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 for modern computers Windows x64 + SSSE3 Windows x64 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64 | Author: MinetaS
Date: Tue Sep 10 22:58:47 2024 +0200 Timestamp: 1726001927 Remove statScore condition in NMP Eliminate the condition that is nearly 100% likelihood of being true. Passed non-regression STC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 208832 W: 54053 L: 54022 D: 100757 Elo +0.05 Ptnml(0-2): 753, 24987, 52901, 25026, 749 https://tests.stockfishchess.org/tests/view/66cddb50bf8c9d8780fdabaf Passed non-regression LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 154344 W: 39132 L: 39047 D: 76165 Elo +0.19 Ptnml(0-2): 115, 17231, 42403, 17300, 123 https://tests.stockfishchess.org/tests/view/66cfafe39de3e7f9b33d1050 closes https://github.com/official-stockfish/Stockfish/pull/5558 Bench: 1393697 see source |
| 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: MinetaS
Date: Mon Sep 9 18:02:32 2024 +0200 Timestamp: 1725897752 Small speedup in incremental accumulator updates Instead of updating at most two accumulators, update all accumluators during incremental updates. Tests have shown that this change yields a small speedup of at least 0.5%, and up to 1% with shorter TC. Passed STC: LLR: 2.93 (-2.94,2.94) <0.00,2.00> Total: 54368 W: 14179 L: 13842 D: 26347 Elo +2.15 Ptnml(0-2): 173, 6122, 14262, 6449, 178 https://tests.stockfishchess.org/tests/view/66db038a9de3e7f9b33d1ad9 Passed 5+0.05: LLR: 2.98 (-2.94,2.94) <0.00,2.00> Total: 55040 W: 14682 L: 14322 D: 26036 Elo +2.27 Ptnml(0-2): 303, 6364, 13856, 6664, 333 https://tests.stockfishchess.org/tests/view/66dbc325dc53972b68218ba7 Passed non-regression LTC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 57390 W: 14555 L: 14376 D: 28459 Elo +1.08 Ptnml(0-2): 37, 5876, 16683, 6069, 30 https://tests.stockfishchess.org/tests/view/66dbc30adc53972b68218ba5 closes https://github.com/official-stockfish/Stockfish/pull/5576 No functional change see source |
| Windows x64 for Haswell CPUs 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 Sep 9 18:02:32 2024 +0200 Timestamp: 1725897752 Use optional for the engine path - A small quality of file change is to change the type of engine path from a string to an optional string, skips the binary directory lookup, which is commonly disabled by people who create wasm builds or include stockfish as a library. closes https://github.com/official-stockfish/Stockfish/pull/5575 No functional change see source |
| 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: Mon Sep 9 18:02:32 2024 +0200 Timestamp: 1725897752 Simplify ttmove reduction Remove condition that clamps reductions for tt move. Passed STC: https://tests.stockfishchess.org/tests/view/66d5f1239de3e7f9b33d14b0 LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 91136 W: 23805 L: 23646 D: 43685 Elo +0.61 Ptnml(0-2): 334, 10328, 24066, 10525, 315 Passed LTC: https://tests.stockfishchess.org/tests/view/66d7c5889de3e7f9b33d1721 LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 139242 W: 35130 L: 35030 D: 69082 Elo +0.25 Ptnml(0-2): 78, 15200, 38986, 15258, 99 closes https://github.com/official-stockfish/Stockfish/pull/5574 Bench: 1268715 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: Mon Sep 9 18:02:32 2024 +0200 Timestamp: 1725897752 Remove ARCH=... from README.md closes https://github.com/official-stockfish/Stockfish/pull/5570 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: MinetaS
Date: Mon Sep 9 18:02:27 2024 +0200 Timestamp: 1725897747 Export and clean up net downloading script Fixes https://github.com/official-stockfish/Stockfish/issues/5564 This patch extracts the net downloading script in Makefile into an external script file. Also the script is moderately rewritten for improved readability and speed. * Use wget preferentially over curl, as curl is known to have slight overhead. * Use command instead of hash to check if command exists. Reportedly, hash always returns zero in some POSIX shells even when the command fails. * Command existence checks (wget/curl, sha256sum) are performed only once at the beginning. * Each of common patterns is encapsulated in a function (get_nnue_filename, validate_network). * Print out error/warning messages to stderr. closes https://github.com/official-stockfish/Stockfish/pull/5563 No functional change Co-authored-by: Disservin <> 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: xu-shawn
Date: Mon Sep 9 17:54:27 2024 +0200 Timestamp: 1725897267 Copy scripts directory in distributed packages closes https://github.com/official-stockfish/Stockfish/pull/5571 No functional change see source |
| 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: Mon Sep 9 17:48:26 2024 +0200 Timestamp: 1725896906 Reduce on ttcaptures if not capture Tweak ttcapture reduction. Reduce on ttcaptures only if the current move is a capture Passed STC: LLR: 2.93 (-2.94,2.94) <0.00,2.00> Total: 94912 W: 24896 L: 24492 D: 45524 Elo +1.48 Ptnml(0-2): 301, 11197, 24087, 11539, 332 https://tests.stockfishchess.org/tests/view/66cd2264bf8c9d8780fdab34 Passed LTC: LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 60738 W: 15465 L: 15096 D: 30177 Elo +2.11 Ptnml(0-2): 42, 6573, 16775, 6932, 47 https://tests.stockfishchess.org/tests/view/66cf356d9de3e7f9b33d0fde closes https://github.com/official-stockfish/Stockfish/pull/5562 Bench: 1268700 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: Mon Sep 9 17:43:05 2024 +0200 Timestamp: 1725896585 Introduce Material Correction History Idea from Caissa (https://github.com/Witek902/Caissa) chess engine. Add a secondary correction history indexed by the material key of a position. The material key is the zobrist hash representing the number of pieces left in a position. Passed STC: LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 189472 W: 49360 L: 48813 D: 91299 Elo +1.00 Ptnml(0-2): 666, 22453, 47953, 22996, 668 https://tests.stockfishchess.org/tests/view/66cbddafbf8c9d8780fda9f1 Passed LTC: LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 224190 W: 57022 L: 56312 D: 110856 Elo +1.10 Ptnml(0-2): 197, 24723, 61540, 25443, 192 https://tests.stockfishchess.org/tests/view/66cd529bbf8c9d8780fdab4c closes https://github.com/official-stockfish/Stockfish/pull/5556 Bench: 1462697 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: Mon Sep 9 17:34:31 2024 +0200 Timestamp: 1725896071 Simplify history bonus After we recently added the disallowance for negative bonuses, it is no longer necessary to keep the max comparison in the previous step. Passed STC: LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 72000 W: 18820 L: 18637 D: 34543 Elo +0.88 Ptnml(0-2): 267, 8489, 18276, 8730, 238 https://tests.stockfishchess.org/tests/view/66ce132cbf8c9d8780fdabe7 Passed LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 67452 W: 17136 L: 16961 D: 33355 Elo +0.90 Ptnml(0-2): 35, 7489, 18519, 7632, 51 https://tests.stockfishchess.org/tests/view/66cf6ad49de3e7f9b33d1010 closes https://github.com/official-stockfish/Stockfish/pull/5554 Bench: 1147012 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: Disservin
Date: Mon Sep 9 17:21:14 2024 +0200 Timestamp: 1725895274 Restore development closes https://github.com/official-stockfish/Stockfish/pull/5580 No functional change see source |
| 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 Sep 6 16:53:45 2024 +0200 Timestamp: 1725634425 Stockfish 17 Official release version of Stockfish 17 Bench: 1484730 --- Stockfish 17 Today we have the pleasure to announce a new major release of Stockfish. As always, you can freely download it at https://stockfishchess.org/download and use it in the GUI of your choice. Don’t forget to join our Discord server[1] to get in touch with the community of developers and users of the project! *Quality of chess play* In tests against Stockfish 16, this release brings an Elo gain of up to 46 points[2] and wins up to 4.5 times more game pairs[3] than it loses. In practice, high-quality moves are now found in less time, with a user upgrading from Stockfish 14 being able to analyze games at least 6 times[4] faster with Stockfish 17 while maintaining roughly the same quality. During this development period, Stockfish won its 9th consecutive first place in the main league of the Top Chess Engine Championship (TCEC)[5], and the 24th consecutive first place in the main events (bullet, blitz, and rapid) of the Computer Chess Championship (CCC)[6]. *Update highlights* *Improved engine lines* This release introduces principal variations (PVs) that are more informative for mate and decisive table base (TB) scores. In both cases, the PV will contain all moves up to checkmate. For mate scores, the PV shown is the best variation known to the engine at that point, while for table base wins, it follows, based on the TB, a sequence of moves that preserves the game outcome to checkmate. *NUMA performance optimization* For high-end computers with multiple CPUs (typically a dual-socket architecture with 100+ cores), this release automatically improves performance with a `NumaPolicy` setting that optimizes non-uniform memory access (NUMA). Although typical consumer hardware will not benefit, speedups of up to 2.8x[7] have been measured. *Shoutouts* *ChessDB* During the past 1.5 years, hundreds of cores have been continuously running Stockfish to grow a database of analyzed positions. This chess cloud database[8] now contains well over 45 billion positions, providing excellent coverage of all openings and commonly played lines. This database is already integrated into GUIs such as En Croissant[9] and Nibbler[10], which access it through the public API. *Leela Chess Zero* Generally considered to be the strongest GPU engine, it continues to provide open data which is essential for training our NNUE networks. They released version 0.31.1[11] of their engine a few weeks ago, check it out! *Website redesign* Our website has undergone a redesign in recent months, most notably in our home page[12], now featuring a darker color scheme and a more modern aesthetic, while still maintaining its core identity. We hope you'll like it as much as we do! *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 11k stars[13] 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[14] to contribute compute resources needed for development. Programmers can contribute to the project either directly to Stockfish[15] (C++), to Fishtest[16] (HTML, CSS, JavaScript, and Python), to our trainer nnue-pytorch[17] (C++ and Python), or to our website[18] (HTML, CSS/SCSS, and JavaScript). The Stockfish team [1] https://discord.gg/GWDRS3kU6R [2] https://tests.stockfishchess.org/tests/view/66d738ba9de3e7f9b33d159a [3] https://tests.stockfishchess.org/tests/view/66d738f39de3e7f9b33d15a0 [4] https://github.com/official-stockfish/Stockfish/wiki/Useful-data#equivalent-time-odds-and-normalized-game-pair-elo [5] https://en.wikipedia.org/wiki/Stockfish_(chess)#Top_Chess_Engine_Championship [6] https://en.wikipedia.org/wiki/Stockfish_(chess)#Chess.com_Computer_Chess_Championship [7] https://github.com/official-stockfish/Stockfish/pull/5285 [8] https://chessdb.cn/queryc_en/ [9] https://encroissant.org/ [10] https://github.com/rooklift/nibbler [11] https://github.com/LeelaChessZero/lc0/releases/tag/v0.31.1 [12] https://stockfishchess.org/ [13] https://github.com/official-stockfish/Stockfish/stargazers [14] https://github.com/official-stockfish/fishtest/wiki/Running-the-worker [15] https://github.com/official-stockfish/Stockfish [16] https://github.com/official-stockfish/fishtest [17] https://github.com/official-stockfish/nnue-pytorch [18] https://github.com/official-stockfish/stockfish-web 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: Tue Sep 3 17:53:23 2024 +0200 Timestamp: 1725378803 Update Top CPU Contributors to the status as of Aug 31st 2024. closes https://github.com/official-stockfish/Stockfish/pull/5561 No functional change see source |
| Windows x64 for Haswell CPUs 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: Robert Nurnberg @ elitebook
Date: Tue Sep 3 17:53:23 2024 +0200 Timestamp: 1725378803 Update the WDL model updates the internal WDL model, using data from 2.6M games played by the revisions since 9fb5832. https://github.com/official-stockfish/Stockfish/pull/5565 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: Tue Sep 3 17:48:58 2024 +0200 Timestamp: 1725378538 Fix some of the tests due to https://github.com/official-stockfish/Stockfish/issues/5185 some CI tests are skipped. This patch fixes a few tests that need updating. closes https://github.com/official-stockfish/Stockfish/pull/5560 No functional change see source |
| 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: Wed Aug 28 09:35:21 2024 +0200 Timestamp: 1724830521 Simpler formula for ss->cutoffCnt update closes https://github.com/official-stockfish/Stockfish/pull/5548 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: Taras Vuk
Date: Wed Aug 28 09:34:09 2024 +0200 Timestamp: 1724830449 rename !(PvNode || cutNode) to allNode Passed STC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 108992 W: 28178 L: 28039 D: 52775 Elo +0.44 Ptnml(0-2): 356, 12428, 28762, 12621, 329 https://tests.stockfishchess.org/tests/view/66c73a51bf8c9d8780fda532 closes https://github.com/official-stockfish/Stockfish/pull/5549 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: Tomasz Sobczyk
Date: Wed Aug 28 08:52:24 2024 +0200 Timestamp: 1724827944 Forcibly split NUMA nodes on Windows split by processor groups due to Window's thread scheduler issues. fixes #5551 closes https://github.com/official-stockfish/Stockfish/pull/5552 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: Taras Vuk
Date: Tue Aug 20 21:37:25 2024 +0200 Timestamp: 1724182645 Tweak late move extensions Allow late move extensions only for PV and cut nodes. Passed STC: LLR: 2.95 (-2.94,2.94) <0.00,2.00> Total: 44512 W: 11688 L: 11355 D: 21469 Elo +2.60 Ptnml(0-2): 167, 5180, 11229, 5513, 167 https://tests.stockfishchess.org/tests/view/66c0509d4ff211be9d4ef10e Passed LTC: LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 152970 W: 39026 L: 38466 D: 75478 Elo +1.27 Ptnml(0-2): 102, 16792, 42164, 17298, 129 https://tests.stockfishchess.org/tests/view/66c0994d21503a509c13b2b6 closes https://github.com/official-stockfish/Stockfish/pull/5541 bench: 1484730 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: Shawn Xu
Date: Tue Aug 20 21:34:19 2024 +0200 Timestamp: 1724182459 Introduce Fail Low History Bonus When a node fails low, give TT move a small bonus 1/4 of normal value. Passed STC: LLR: 2.95 (-2.94,2.94) <0.00,2.00> Total: 92384 W: 24094 L: 23691 D: 44599 Elo +1.52 Ptnml(0-2): 323, 10852, 23465, 11203, 349 https://tests.stockfishchess.org/tests/view/66be80794ff211be9d4eed68 Passed LTC: LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 114660 W: 29260 L: 28778 D: 56622 Elo +1.46 Ptnml(0-2): 97, 12506, 31653, 12966, 108 https://tests.stockfishchess.org/tests/view/66bf63ee4ff211be9d4eeef0 closes https://github.com/official-stockfish/Stockfish/pull/5539 bench 1463003 see source |
| Windows x64 for Haswell CPUs 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: Tue Aug 20 21:31:33 2024 +0200 Timestamp: 1724182293 Simplify stand pat adjustement Remove && !PvNode condition for stand pat adjustement in quiescence search. Passed non-regression STC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 108544 W: 28228 L: 28085 D: 52231 Elo +0.46 Ptnml(0-2): 389, 12902, 27554, 13031, 396 https://tests.stockfishchess.org/tests/view/66bb402e4ff211be9d4ee688 Passed non-regression LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 193014 W: 48796 L: 48751 D: 95467 Elo +0.08 Ptnml(0-2): 188, 21481, 53116, 21542, 180 https://tests.stockfishchess.org/tests/view/66bc78774ff211be9d4ee88f closes https://github.com/official-stockfish/Stockfish/pull/5538 Bench 1787360 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: Tue Aug 20 21:27:58 2024 +0200 Timestamp: 1724182078 Simplify doShallowerSearch Passed Non-regression STC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 242336 W: 62657 L: 62663 D: 117016 Elo -0.01 Ptnml(0-2): 941, 28949, 61418, 28895, 965 https://tests.stockfishchess.org/tests/view/66bc13c34ff211be9d4ee794 Passed Non-regression LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 128100 W: 32503 L: 32390 D: 63207 Elo +0.31 Ptnml(0-2): 106, 14319, 35113, 14380, 132 https://tests.stockfishchess.org/tests/view/66bdbb304ff211be9d4eec5d closes https://github.com/official-stockfish/Stockfish/pull/5537 bench 1586246 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: Tue Aug 20 21:24:04 2024 +0200 Timestamp: 1724181844 Simplify bestMove promotion Passed Non-regression STC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 216768 W: 56240 L: 56217 D: 104311 Elo +0.04 Ptnml(0-2): 794, 24900, 56956, 24957, 777 https://tests.stockfishchess.org/tests/view/66bc11324ff211be9d4ee78b Passed Non-regression LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 44970 W: 11391 L: 11199 D: 22380 Elo +1.48 Ptnml(0-2): 44, 4596, 13002, 4810, 33 https://tests.stockfishchess.org/tests/view/66bdbb1b4ff211be9d4eec5a closes https://github.com/official-stockfish/Stockfish/pull/5535 bench: 1613043 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: Tue Aug 20 20:59:36 2024 +0200 Timestamp: 1724180376 Update default main net to nn-1111cefa1111.nnue Created from 2 distinct spsa tunes of the latest main net (nn-31337bea577c.nnue) and applying the params to the prior main net (nn-e8bac1c07a5a.nnue). This effectively reverts the modifications to output weights and biases in https://github.com/official-stockfish/Stockfish/pull/5509 SPSA: A: 6000, alpha: 0.602, gamma: 0.101 1st - 437 feature transformer biases where values are < 25 54k / 120k games at 180+1.8 https://tests.stockfishchess.org/tests/view/66af98ac4ff211be9d4edad0 nn-808259761cca.nnue 2nd - 208 L2 weights where values are zero 112k / 120k games at 180+1.8 https://tests.stockfishchess.org/tests/view/66b0c3074ff211be9d4edbe5 nn-a56cb8c3d477.nnue When creating the above 2 nets (nn-808259761cca.nnue, nn-a56cb8c3d477.nnue), spsa params were unintentionally applied to nn-e8bac1c07a5a.nnue rather than nn-31337bea577c.nnue due to an issue in a script that creates nets by applying spsa results to base nets. Since they both passed STC and were neutral or slightly positive at LTC, they were combined to see if the elo from each set of params was additive. The 2 nets can be merged on top of nn-e8bac1c07a5a.nnue with: https://github.com/linrock/nnue-tools/blob/90942d3/spsa/combine_nnue.py ``` python3 combine_nnue.py \ nn-e8bac1c07a5a.nnue \ nn-808259761cca.nnue \ nn-a56cb8c3d477.nnue ``` Merging yields nn-87caa003fc6a.nnue which was renamed to nn-1111cefa1111.nnue with an updated nnue-namer around 10x faster than before by: - using a prefix trie for efficient prefix matches - modifying 4 non-functional bytes near the end of the file instead of 2 https://github.com/linrock/nnue-namer Thanks to @MinetaS for pointing out in #nnue-dev what the non-functional bytes are: L3 is 32, 4 bytes for biases, 32 bytes for weights. (fc_2) So -38 and -37 are technically -2 and -1 of fc_1 (type AffineTransform<30, 32>) And since InputDimension is padded to 32 there are total 32 of 2 adjacent bytes padding. So yes, it's non-functional whatever values are there. It's possible to tweak bytes at -38 - 32 * N and -37 - 32 * N given N = 0 ... 31 The net renamed with the new method passed non-regression STC vs. the original net: https://tests.stockfishchess.org/tests/view/66c0f0a821503a509c13b332 To print the spsa params with nnue-pytorch: ``` import features from serialize import NNUEReader feature_set = features.get_feature_set_from_name("HalfKAv2_hm") with open("nn-31337bea577c.nnue", "rb") as f: model = NNUEReader(f, feature_set).model c_end = 16 for i,ft_bias in enumerate(model.input.bias.data[:3072]): value = int(ft_bias * 254) if abs(value) < 25: print(f"ftB[{i}],{value},-1024,1024,{c_end},0.0020") c_end = 6 for i in range(8): for j in range(32): for k in range(30): value = int(model.layer_stacks.l2.weight.data[32 * i + j, k] * 64) if value == 0: print(f"twoW[{i}][{j}][{k}],{value},-127,127,{c_end},0.0020") ``` New params found with the same method as: https://github.com/official-stockfish/Stockfish/pull/5459 Passed STC: https://tests.stockfishchess.org/tests/view/66b4d4464ff211be9d4edf6e LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 136416 W: 35753 L: 35283 D: 65380 Elo +1.20 Ptnml(0-2): 510, 16159, 34416, 16597, 526 Passed LTC: https://tests.stockfishchess.org/tests/view/66b76e814ff211be9d4ee1cc LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 159336 W: 40753 L: 40178 D: 78405 Elo +1.25 Ptnml(0-2): 126, 17497, 43864, 18038, 143 closes https://github.com/official-stockfish/Stockfish/pull/5534 bench 1613043 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 for modern computers 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 Aug 20 20:57:07 2024 +0200 Timestamp: 1724180227 Simplify cutnode reduction formula Passed STC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 137994 W: 34705 L: 34603 D: 68686 Elo +0.26 Ptnml(0-2): 124, 15371, 37903, 15477, 122 https://tests.stockfishchess.org/tests/view/66aeb74b4ff211be9d4eda10 Passed LTC: LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 131456 W: 34148 L: 34031 D: 63277 Elo +0.31 Ptnml(0-2): 506, 15571, 33465, 15672, 514 https://tests.stockfishchess.org/tests/view/66ae258b4ff211be9d4ed95d closes https://github.com/official-stockfish/Stockfish/pull/5531 Bench: 1261995 see source |