| 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: Sun Oct 5 09:33:42 2025 +0200 Timestamp: 1759649622 remove clang-format workaround closes https://github.com/official-stockfish/Stockfish/pull/6332 No functional change see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 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: Timothy Herchen
Date: Sun Oct 5 09:33:23 2025 +0200 Timestamp: 1759649603 Split accumulator 3-Way Squeeze a tiny bit more juice from the original idea in #6336 which this is on top of. https://tests.stockfishchess.org/tests/view/68dddd85fa806e2e8393c0b9 LLR: 2.95 (-2.94,2.94) <0.00,2.00> Total: 156320 W: 40925 L: 40447 D: 74948 Elo +1.06 Ptnml(0-2): 427, 17330, 42172, 17800, 431 4-way doesn't look to be better than this. https://tests.stockfishchess.org/tests/view/68dde19efa806e2e8393c0c1 closes https://github.com/official-stockfish/Stockfish/pull/6339 No functional change Co-authored-by: M Stembera <> 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: FauziAkram
Date: Sun Oct 5 09:25:44 2025 +0200 Timestamp: 1759649144 Tweak Correction History Bonus Asymmetrically Refine the correction history update by applying an asymmetric bonus based on the type of evaluation error. It differentiates between negative corrections and positive corrections. Passed STC: LLR: 2.93 (-2.94,2.94) <0.00,2.00> Total: 165184 W: 43314 L: 42807 D: 79063 Elo +1.07 Ptnml(0-2): 551, 19391, 42261, 19778, 611 https://tests.stockfishchess.org/tests/view/68cae49902c43c969fe7f008 Passed LTC: LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 243234 W: 62765 L: 62029 D: 118440 Elo +1.05 Ptnml(0-2): 163, 25996, 68551, 26756, 151 https://tests.stockfishchess.org/tests/view/68d1c50dfa806e2e8393aa1f closes https://github.com/official-stockfish/Stockfish/pull/6338 Bench: 2746404 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: nicolasduhamel
Date: Sun Oct 5 09:23:02 2025 +0200 Timestamp: 1759648982 Adjust aspiration window Narrow the aspiration window after fail high. Passed STC: LLR: 2.98 (-2.94,2.94) <0.00,2.00> Total: 51296 W: 13550 L: 13207 D: 24539 Elo +2.32 Ptnml(0-2): 165, 5971, 13052, 6276, 184 https://tests.stockfishchess.org/tests/view/68d99afffa806e2e8393b7ae Passed LTC; LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 87780 W: 22795 L: 22375 D: 42610 Elo +1.66 Ptnml(0-2): 52, 9340, 24694, 9744, 60 https://tests.stockfishchess.org/tests/view/68dae0a6fa806e2e8393baad See the comments in #6293 discussing the mechanisms leading to issue #6296 closes https://github.com/official-stockfish/Stockfish/pull/6337 Bench: 2336606 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: Sun Oct 5 09:18:16 2025 +0200 Timestamp: 1759648696 Further simplify low ply history in evasions Passed Non-regression STC (vs #6308): LLR: 2.96 (-2.94,2.94) <-1.75,0.25> Total: 174208 W: 45414 L: 45343 D: 83451 Elo +0.14 Ptnml(0-2): 633, 20324, 45095, 20443, 609 https://tests.stockfishchess.org/tests/view/68c24be359efc3c96b611487 Passed Non-regression LTC (vs #6308): LLR: 2.96 (-2.94,2.94) <-1.75,0.25> Total: 110070 W: 28099 L: 27969 D: 54002 Elo +0.41 Ptnml(0-2): 56, 11919, 30962, 12035, 63 https://tests.stockfishchess.org/tests/view/68c4efa559efc3c96b611dfc closes https://github.com/official-stockfish/Stockfish/pull/6321 Bench: 2151873 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: Sun Sep 28 21:21:57 2025 +0200 Timestamp: 1759087317 Simplify use of low-ply history in evasions Passed Non-regression STC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 65024 W: 16991 L: 16804 D: 31229 Elo +1.00 Ptnml(0-2): 182, 7423, 17119, 7602, 186 https://tests.stockfishchess.org/tests/view/68c23f5459efc3c96b6113df Passed Non-regression LTC: LLR: 2.96 (-2.94,2.94) <-1.75,0.25> Total: 207312 W: 53126 L: 53095 D: 101091 Elo +0.05 Ptnml(0-2): 126, 21986, 59389, 22041, 114 https://tests.stockfishchess.org/tests/view/68c241e359efc3c96b6113ef closes https://github.com/official-stockfish/Stockfish/pull/6308 Bench: 2515619 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: Sun Sep 28 21:19:22 2025 +0200 Timestamp: 1759087162 Simplify a separate term in low ply history bonus formula Passed Non-regression STC: LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 211200 W: 54887 L: 54860 D: 101453 Elo +0.04 Ptnml(0-2): 719, 24894, 54296, 25023, 668 https://tests.stockfishchess.org/tests/view/68c21e7f59efc3c96b6112c8 Passed Non-regression LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 217842 W: 55587 L: 55568 D: 106687 Elo +0.03 Ptnml(0-2): 130, 23651, 61313, 23724, 103 https://tests.stockfishchess.org/tests/view/68c230ec59efc3c96b61135a closes https://github.com/official-stockfish/Stockfish/pull/6307 Bench: 2070860 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 Sep 28 21:14:28 2025 +0200 Timestamp: 1759086868 Simplify away conthist 0 While at it, I also added the scaler note to the Lmrdepth/history formula. Passed STC: LLR: 2.96 (-2.94,2.94) <-1.75,0.25> Total: 25376 W: 6660 L: 6423 D: 12293 Elo +3.24 Ptnml(0-2): 77, 2947, 6403, 3184, 77 https://tests.stockfishchess.org/tests/view/68c1ccf759efc3c96b610deb Passed LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 208464 W: 53371 L: 53342 D: 101751 Elo +0.05 Ptnml(0-2): 110, 22776, 58426, 22815, 105 https://tests.stockfishchess.org/tests/view/68c1d04b59efc3c96b610e13 closes https://github.com/official-stockfish/Stockfish/pull/6304 Bench: 2029296 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: Shawn Xu
Date: Sun Sep 28 21:12:01 2025 +0200 Timestamp: 1759086721 Simplify Probcut Clamp Further Passed Non-regression STC: LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 157984 W: 41116 L: 41030 D: 75838 Elo +0.19 Ptnml(0-2): 568, 18570, 40601, 18714, 539 https://tests.stockfishchess.org/tests/view/68b750518f94a4e5a7fe76cd Passed Non-regression LTC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 335232 W: 85443 L: 85543 D: 164246 Elo -0.10 Ptnml(0-2): 177, 36616, 94137, 36502, 184 https://tests.stockfishchess.org/tests/view/68bc767259efc3c96b61076b closes https://github.com/official-stockfish/Stockfish/pull/6303 Bench: 2213844 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: Sun Sep 28 21:08:58 2025 +0200 Timestamp: 1759086538 Remove quiet move streak Passed Non-regression STC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 67712 W: 17744 L: 17555 D: 32413 Elo +0.97 Ptnml(0-2): 204, 8030, 17274, 8069, 279 https://tests.stockfishchess.org/tests/view/68b784628f94a4e5a7fe7706 Passed Non-regression LTC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 196050 W: 50270 L: 50228 D: 95552 Elo +0.07 Ptnml(0-2): 122, 21465, 54813, 21499, 126 https://tests.stockfishchess.org/tests/view/68ba119d8f94a4e5a7fe7941 closes https://github.com/official-stockfish/Stockfish/pull/6299 Bench: 2238789 Co-authored-by: Daniel Monroe <> 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: Timothy Herchen
Date: Sun Sep 28 21:04:29 2025 +0200 Timestamp: 1759086269 Shave some instructions off a hot loop in affine transform On x86, GCC generates highly suboptimal code for this loop in its old form, about 2x as many instructions as necessary. This decreases throughput especially in an SMT setting. Clang does a better job but this change still has some improvement. Note that the std::ptrdiff_t type is not optional; using an unsigned type brings back the bad assembly. (Not sure why, but it seems reliable on all the GCC versions I tested.) passed STC: LLR: 2.93 (-2.94,2.94) <0.00,2.00> Total: 44672 W: 11841 L: 11527 D: 21304 Elo +2.44 Ptnml(0-2): 165, 4625, 12415, 4993, 138 https://tests.stockfishchess.org/tests/view/68d8111efa806e2e8393b10e closes https://github.com/official-stockfish/Stockfish/pull/6331 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: Michael Chaly
Date: Sun Sep 28 20:56:36 2025 +0200 Timestamp: 1759085796 Extend nodes pre qsearch only with deep enough tt entries Modification of current pre qsearch extensions - allowing it only for deep enough tt entries. Passed STC: https://tests.stockfishchess.org/tests/view/68c954d302c43c969fe7eea5 LLR: 2.93 (-2.94,2.94) <0.00,2.00> Total: 35872 W: 9548 L: 9236 D: 17088 Elo +3.02 Ptnml(0-2): 101, 4075, 9295, 4341, 124 Passed LTC: https://tests.stockfishchess.org/tests/view/68ca4e4f02c43c969fe7ef5f LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 107754 W: 27784 L: 27324 D: 52646 Elo +1.48 Ptnml(0-2): 47, 11528, 30300, 11922, 80 closes https://github.com/official-stockfish/Stockfish/pull/6324 bench: 2462792 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: Sun Sep 28 20:53:47 2025 +0200 Timestamp: 1759085627 Simplify RFP return value Passed non-regression STC: LLR: 2.96 (-2.94,2.94) <-1.75,0.25> Total: 220800 W: 57351 L: 57332 D: 106117 Elo +0.03 Ptnml(0-2): 726, 26200, 56548, 26181, 745 https://tests.stockfishchess.org/tests/view/68b1db6e6217b8721dca9c67 Passed gainer LTC: LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 257820 W: 66286 L: 65523 D: 126011 Elo +1.03 Ptnml(0-2): 118, 27586, 72779, 28269, 158 https://tests.stockfishchess.org/tests/view/68c1d40859efc3c96b610e3d closes https://github.com/official-stockfish/Stockfish/pull/6310 bench: 2364596 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: Sun Sep 28 20:51:34 2025 +0200 Timestamp: 1759085494 Double PawnHistory size and update formula Doubling PAWN_HISTORY_SIZE to 1024. So with that, we can apply a stronger learning signal. The bonus/malus multipliers in the update_quiet_histories function have been increased accordingly. Passed STC: LLR: 2.97 (-2.94,2.94) <0.00,2.00> Total: 111008 W: 29136 L: 28708 D: 53164 Elo +1.34 Ptnml(0-2): 367, 12870, 28609, 13284, 374 https://tests.stockfishchess.org/tests/view/68c201d659efc3c96b61117e Passed LTC: LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 117210 W: 30142 L: 29664 D: 57404 Elo +1.42 Ptnml(0-2): 49, 12532, 32970, 13000, 54 https://tests.stockfishchess.org/tests/view/68c20a6259efc3c96b6111ef closes https://github.com/official-stockfish/Stockfish/pull/6306 Bench: 2788334 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: Syine Mineta
Date: Sun Sep 28 20:49:24 2025 +0200 Timestamp: 1759085364 Penalty to TT move history on MultiCut If a reduced search fails high with the TT move excluded, we know that there are multiple moves that can produce cutoffs. Applying a penalty to the TT move history reduces extensions for TT moves so that it may spend a bit more time exploring other moves. Passed STC: LLR: 2.93 (-2.94,2.94) <0.00,2.00> Total: 263680 W: 68965 L: 68313 D: 126402 Elo +0.86 Ptnml(0-2): 855, 31090, 67336, 31666, 893 https://tests.stockfishchess.org/tests/view/68c1f65a59efc3c96b6110e5 Passed LTC: LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 61008 W: 15713 L: 15350 D: 29945 Elo +2.07 Ptnml(0-2): 27, 6428, 17235, 6783, 31 https://tests.stockfishchess.org/tests/view/68c1fc5359efc3c96b611141 Passed non-regression VLTC (60+0.6, Threads=8): LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 50340 W: 13003 L: 12830 D: 24507 Elo +1.19 Ptnml(0-2): 3, 4570, 15849, 4747, 1 https://tests.stockfishchess.org/tests/view/68c2056559efc3c96b6111c3 closes https://github.com/official-stockfish/Stockfish/pull/6305 Bench: 2342975 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: Sebastian Buchwald
Date: Sun Sep 28 20:46:42 2025 +0200 Timestamp: 1759085202 Replace deprecated macOS 13 runner image The macOS 13 runner image will be retired by December 4th, 2025. closes https://github.com/official-stockfish/Stockfish/pull/6330 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 Sep 28 20:45:30 2025 +0200 Timestamp: 1759085130 add multithreaded matetrack runs to CI Add runs with --threads 4 to our matetrack CI. These won't be deterministic, of course. But they may catch early some multithreading bugs in our mate reporting. Motivated by #6293 and #6296. https://github.com/official-stockfish/Stockfish/pull/6297 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: Disservin
Date: Sun Sep 28 20:43:54 2025 +0200 Timestamp: 1759085034 simplify upload_binaries ci Previously the upload step used the os of the artifact to create the upload and used an extra msys2 step. This is in fact not needed and we can do all required changes on ubuntu instead. closes https://github.com/official-stockfish/Stockfish/pull/6294 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: Syine Mineta
Date: Sat Sep 13 08:18:52 2025 +0200 Timestamp: 1757744332 Revert "Adjustment of the aspiration window after fail high/low." This reverts commit bfc7000597b8b5b0899e99bc911f6120a75c6297. Fixes https://github.com/official-stockfish/Stockfish/issues/6296 After this commit a bug has been reported when the position is close to mate or being mated. Since no workarounds have been suggested yet, it is best to revert this commit until a better solution is found. closes https://github.com/official-stockfish/Stockfish/pull/6309 Bench: 2493363 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: Stefan Geschwentner
Date: Sat Sep 6 07:57:57 2025 +0200 Timestamp: 1757138277 Adjustment of the aspiration window after fail high/low. For the new bound in the opposite direction of the fail, use a weighted average of alpha, beta and best value +- delta. In the case of a fail high, different average weights are used depending on whether or not there was a best move change during the last search. The weights are determined from the following two consecutive LTC tunings. First tuning: https://tests.stockfishchess.org/tests/view/68ab727975da51a345a5ac2e Second tuning: https://tests.stockfishchess.org/tests/view/68aba3fe75da51a345a5ad52 Passed LTC: LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 39504 W: 10243 L: 9947 D: 19314 Elo +2.60 Ptnml(0-2): 25, 4182, 11041, 4480, 24 https://tests.stockfishchess.org/tests/view/68acbb6d6217b8721dca95f8 Passed VLTC: LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 91196 W: 23574 L: 23167 D: 44455 Elo +1.55 Ptnml(0-2): 13, 8943, 27276, 9356, 10 https://tests.stockfishchess.org/tests/view/68af64786217b8721dca993d closes https://github.com/official-stockfish/Stockfish/pull/6292 Bench: 2785713 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: Sat Sep 6 07:55:14 2025 +0200 Timestamp: 1757138114 Reintroduce #6259 Reintroduces af181d9, which no longer regresses on matetrack after #6286 Using ./stockfish on matetrack.epd with --nodes 1000000 Engine ID: Stockfish dev-20250902-adfddd2c Total FENs: 6554 Found mates: 3490 Best mates: 2429 Passed Non-regression LTC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 37608 W: 9726 L: 9523 D: 18359 Elo +1.88 Ptnml(0-2): 16, 4001, 10578, 4182, 27 https://tests.stockfishchess.org/tests/view/68b886778f94a4e5a7fe77d9 closes https://github.com/official-stockfish/Stockfish/pull/6289 Bench: 2493363 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 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 Sep 2 20:42:03 2025 +0200 Timestamp: 1756838523 Add scaling note to STC/LTC tunes It has been repeatedly shown that such tunes are suspectible to become anti-scaling. Below are some recent examples: https://github.com/official-stockfish/Stockfish/commit/2e91a8635468e40c89a2303ce50384864d088611 https://github.com/official-stockfish/Stockfish/commit/d11f49b790429c236a1a4169f0d8052635fc03dc Passed STC: LLR: 2.95 (-2.94,2.94) <0.00,2.00> Total: 32448 W: 8651 L: 8342 D: 15455 Elo +3.31 Ptnml(0-2): 81, 3695, 8408, 3914, 126 https://tests.stockfishchess.org/tests/view/6899489b0049e8ccef9d64ad Passed LTC: LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 73854 W: 19042 L: 18649 D: 36163 Elo +1.85 Ptnml(0-2): 37, 7908, 20659, 8271, 52 https://tests.stockfishchess.org/tests/view/689abbe7fd8719b088c8d514 Revert VVLTC with STC bound: LLR: 2.95 (-2.94,2.94) <0.00,2.00> Total: 53802 W: 14030 L: 13740 D: 26032 Elo +1.87 Ptnml(0-2): 5, 4924, 16754, 5212, 6 https://tests.stockfishchess.org/tests/view/68a9a9f575da51a345a5a675 Revert VVLTC with LTC bound: LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 53658 W: 14022 L: 13699 D: 25937 Elo +2.09 Ptnml(0-2): 3, 4894, 16712, 5217, 3 https://tests.stockfishchess.org/tests/view/68a8d2b2b6fb3300203bca77 https://tests.stockfishchess.org/tests/view/688cf38bf17748b4d23c8057 https://tests.stockfishchess.org/tests/view/6890bc7792fcad741b804a19 Passed LTC: LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 74928 W: 19466 L: 19071 D: 36391 Elo +1.83 Ptnml(0-2): 37, 8048, 20901, 8439, 39 Failed Non-regression VLTC: LLR: -2.94 (-2.94,2.94) <-1.75,0.25> Total: 57704 W: 14643 L: 14928 D: 28133 Elo -1.72 Ptnml(0-2): 5, 5925, 17280, 5634, 8 https://tests.stockfishchess.org/tests/view/6890bc7792fcad741b804a19 (Note that an STC-tuned version passed non-regression, but was shortly simplified) https://github.com/official-stockfish/Stockfish/pull/6040 Passed STC: LLR: 2.93 (-2.94,2.94) <0.00,2.00> Total: 27776 W: 7352 L: 7054 D: 13370 Elo +3.73 Ptnml(0-2): 68, 3126, 7221, 3386, 87 https://tests.stockfishchess.org/tests/view/680ec0f83629b02d74b1605b Passed LTC: LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 161304 W: 41432 L: 40864 D: 79008 Elo +1.22 Ptnml(0-2): 61, 17305, 45357, 17863, 66 https://tests.stockfishchess.org/tests/view/680ec7f93629b02d74b16084 Failed Non-regression VVLTC: LLR: -2.94 (-2.94,2.94) <-1.75,0.25> Total: 313466 W: 80573 L: 81089 D: 151804 Elo -0.57 Ptnml(0-2): 38, 29689, 97782, 29199, 25 https://tests.stockfishchess.org/tests/view/6810d0533629b02d74b16756 https://github.com/official-stockfish/Stockfish/pull/5907 https://github.com/official-stockfish/Stockfish/pull/5887 Passed LTC with STC bounds: https://tests.stockfishchess.org/tests/view/67b115dd6c6b9e172ad1592f LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 75756 W: 19393 L: 19044 D: 37319 Elo +1.60 Ptnml(0-2): 60, 8251, 20913, 8588, 66 Passed LTC with LTC bounds: https://tests.stockfishchess.org/tests/view/67af5f5d6c6b9e172ad15765 LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 108126 W: 27880 L: 27412 D: 52834 Elo +1.50 Ptnml(0-2): 85, 11786, 29866, 12228, 98 Revert VVLTC w/ STC bounds: LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 56342 W: 14536 L: 14246 D: 27560 Elo +1.79 Ptnml(0-2): 7, 5061, 17741, 5359, 3 https://tests.stockfishchess.org/tests/view/67be4f8ad8d5c2c657c52d10 Revert VVLTC w/ LTC bounds: LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 66562 W: 17364 L: 17016 D: 32182 Elo +1.82 Ptnml(0-2): 3, 6145, 20637, 6493, 3 https://tests.stockfishchess.org/tests/view/67bcd25ff6b602bd7222ea40 closes https://github.com/official-stockfish/Stockfish/pull/6284 no functional change see source |
| Windows x64 for Haswell CPUs 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 Sep 2 20:41:08 2025 +0200 Timestamp: 1756838468 Simplify SMP Reduction Passed Non-regression SMP STC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 232784 W: 59845 L: 59841 D: 113098 Elo +0.01 Ptnml(0-2): 289, 26459, 62934, 26379, 331 https://tests.stockfishchess.org/tests/view/68ab96bf75da51a345a5acd6 Passed Non-regression SMP LTC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 374270 W: 95978 L: 96113 D: 182179 Elo -0.13 Ptnml(0-2): 118, 38575, 109888, 38432, 122 https://tests.stockfishchess.org/tests/view/68abcf1c75da51a345a5adb6 closes https://github.com/official-stockfish/Stockfish/pull/6285 Bench: 2667107 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 Sep 2 20:39:02 2025 +0200 Timestamp: 1756838342 simplify stalemate further Non-regression STC: LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 155200 W: 40650 L: 40562 D: 73988 Elo +0.20 Ptnml(0-2): 533, 17588, 41258, 17700, 521 https://tests.stockfishchess.org/tests/view/68abe11375da51a345a5adec Non-regression LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 82824 W: 21442 L: 21287 D: 40095 Elo +0.65 Ptnml(0-2): 51, 8738, 23675, 8901, 47 https://tests.stockfishchess.org/tests/view/68b205606217b8721dca9c8e 10k Stalemate: Elo: 1.46 ± 1.2 (95%) LOS: 99.0% Total: 10000 W: 4640 L: 4598 D: 762 Elo +1.46 Ptnml(0-2): 0, 140, 4678, 182, 0 https://tests.stockfishchess.org/tests/view/68b2059b6217b8721dca9c90 closes https://github.com/official-stockfish/Stockfish/pull/6283 Bench: 2431727 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: Daniel Monroe
Date: Tue Sep 2 20:37:04 2025 +0200 Timestamp: 1756838224 Simplify sign term in quiet histories Simplify sign term in quiet histories Passed simplification STC LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 497824 W: 129130 L: 129418 D: 239276 Elo -0.20 Ptnml(0-2): 1546, 59040, 128008, 58792, 1526 https://tests.stockfishchess.org/tests/view/68a2a9c1b6fb3300203bc3ed Passed simplification LTC LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 70830 W: 18185 L: 18016 D: 34629 Elo +0.83 Ptnml(0-2): 36, 7658, 19861, 7821, 39 https://tests.stockfishchess.org/tests/view/68af36c96217b8721dca98d9 closes https://github.com/official-stockfish/Stockfish/pull/6282 Bench: 2393762 see source |