| 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: Daniel Monroe
Date: Sun Aug 24 19:47:20 2025 +0200 Timestamp: 1756057640 Remove upper bound in see margin Passed simplification STC LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 99840 W: 25965 L: 25815 D: 48060 Elo +0.52 Ptnml(0-2): 326, 11708, 25688, 11886, 312 https://tests.stockfishchess.org/tests/view/68a24504b6fb3300203bbdae Passed simplification LTC LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 248388 W: 63544 L: 63556 D: 121288 Elo -0.02 Ptnml(0-2): 125, 27132, 69709, 27086, 142 https://tests.stockfishchess.org/tests/view/68a24f3bb6fb3300203bbdee closes https://github.com/official-stockfish/Stockfish/pull/6250 Bench: 2432765 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 Samek
Date: Sun Aug 24 19:45:23 2025 +0200 Timestamp: 1756057523 Remove depth reduction in the full-depth search Passed simplification STC: LLR: 2.96 (-2.94,2.94) <-1.75,0.25> Total: 217184 W: 56218 L: 56195 D: 104771 Elo +0.04 Ptnml(0-2): 627, 25673, 55985, 25664, 643 https://tests.stockfishchess.org/tests/view/68a21e0eb6fb3300203bbcf3 Passed simplification LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 30474 W: 7923 L: 7713 D: 14838 Elo +2.39 Ptnml(0-2): 20, 3205, 8569, 3431, 12 https://tests.stockfishchess.org/tests/view/68a2adacb6fb3300203bc3f9 closes https://github.com/official-stockfish/Stockfish/pull/6246 bench 2626263 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: Sun Aug 24 19:43:48 2025 +0200 Timestamp: 1756057428 Simplify depth condition in prior reduction Passed simplification STC LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 172864 W: 45085 L: 45015 D: 82764 Elo +0.14 Ptnml(0-2): 516, 20456, 44405, 20552, 503 https://tests.stockfishchess.org/tests/view/68a24791b6fb3300203bbdb6 Passed simplification LTC LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 84738 W: 21733 L: 21578 D: 41427 Elo +0.64 Ptnml(0-2): 49, 9169, 23780, 9320, 51 https://tests.stockfishchess.org/tests/view/68a2665ab6fb3300203bc269 closes https://github.com/official-stockfish/Stockfish/pull/6244 Bench: 2131292 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 Aug 24 19:40:40 2025 +0200 Timestamp: 1756057240 CI: fix typo in flag closes https://github.com/official-stockfish/Stockfish/pull/6247 No functional change see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 for modern computers Windows x64 + SSSE3 Windows x64 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64 | Author: FauziAkram
Date: Sun Aug 24 19:39:49 2025 +0200 Timestamp: 1756057189 Set back static constexpr closes https://github.com/official-stockfish/Stockfish/pull/6243 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: Myself
Date: Sun Aug 24 19:37:58 2025 +0200 Timestamp: 1756057078 Speedup_threat_by_lesser This patch could have been considered a non-functional speedup, but changing the ranking of illegal moves. Passed STC: LLR: 2.95 (-2.94,2.94) <0.00,2.00> Total: 131040 W: 34247 L: 33792 D: 63001 Elo +1.21 Ptnml(0-2): 407, 15281, 33675, 15764, 393 https://tests.stockfishchess.org/tests/live_elo/68a9a75b75da51a345a5a66d Passed LTC: LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 280146 W: 72055 L: 71242 D: 136849 Elo +1.01 Ptnml(0-2): 153, 30252, 78438, 31089, 141 https://tests.stockfishchess.org/tests/view/68a9f58475da51a345a5a6e0 closes https://github.com/official-stockfish/Stockfish/pull/6261 Bench: 2321931 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: Sun Aug 24 19:30:31 2025 +0200 Timestamp: 1756056631 Remove log depth reduction terms. Motivated by the elo loss of last VVLTC regression test i remove the new log depth reductions (tuned at STC) to regain strength at VVLTC. The constant terms are adjusted based on the old values and the changes from the last added VVLTC tuning. Passed 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 Passed 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 closes https://github.com/official-stockfish/Stockfish/pull/6257 Bench: 2566780 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 Aug 17 22:46:04 2025 +0200 Timestamp: 1755463564 VVLTC tweak Passed VVLTC with STC bounds: LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 60796 W: 15908 L: 15609 D: 29279 Elo +1.71 Ptnml(0-2): 6, 5598, 18889, 5901, 4 https://tests.stockfishchess.org/tests/view/68a1fbfeb6fb3300203bbc5c Passed VVLTC with LTC bounds: LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 24914 W: 6528 L: 6256 D: 12130 Elo +3.79 Ptnml(0-2): 4, 2263, 7648, 2541, 1 https://tests.stockfishchess.org/tests/view/68a211aeb6fb3300203bbca7 closes https://github.com/official-stockfish/Stockfish/pull/6241 Bench: 2130122 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: Stefan Geschwentner
Date: Sun Aug 17 22:39:49 2025 +0200 Timestamp: 1755463189 Bigger thread dependent initial window. Increase the initial delta of the aspiration window by "thread id mod 8". Passed SMP STC: LLR: 2.96 (-2.94,2.94) <0.00,2.00> Total: 106176 W: 27470 L: 27069 D: 51637 Elo +1.31 Ptnml(0-2): 121, 12032, 28386, 12423, 126 https://tests.stockfishchess.org/tests/view/68a178fab6fb3300203bbaec Passed SMP LTC: LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 133076 W: 34272 L: 33772 D: 65032 Elo +1.31 Ptnml(0-2): 38, 13709, 38537, 14223, 31 https://tests.stockfishchess.org/tests/view/68a1b5d2b6fb3300203bbb71 closes https://github.com/official-stockfish/Stockfish/pull/6239 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: 87
Date: Sun Aug 17 22:38:09 2025 +0200 Timestamp: 1755463089 Add performance warning comment for vpcompressw closes https://github.com/official-stockfish/Stockfish/pull/6237 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: Stefan Geschwentner
Date: Sun Aug 17 22:35:03 2025 +0200 Timestamp: 1755462903 Fix undefined behavior in stalemate trap detection. An important part of it is a function which detects if we can move a king or pawn. If this function called before quiet move generation phase the end of the checked move list is undefined (Thanks to AliceRoselia pointing out we have some problem because of wrong bench in a test). This problem exists also in master but is really rarely triggered (thanks to vondele which found one) but it seen significant more often if the capture order score is increased. This fix now simply assumes in this case (and other similiar cases) that a king or pawn can move without checking any moves. Passed non-regression STC (with default book): LLR: 3.03 (-2.94,2.94) <-1.75,0.25> Total: 203008 W: 52465 L: 52424 D: 98119 Elo +0.07 Ptnml(0-2): 498, 20293, 59893, 20310, 510 https://tests.stockfishchess.org/tests/view/68a06ec5fd8719b088c8dc1a Passed non-regression STC (with stalemates book): LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 31616 W: 14418 L: 14366 D: 2832 Elo +0.57 Ptnml(0-2): 1, 189, 15375, 243, 0 https://tests.stockfishchess.org/tests/view/68a07538fd8719b088c8dc1f closes https://github.com/official-stockfish/Stockfish/pull/6235 Bench: 2996176 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 Aug 17 22:32:03 2025 +0200 Timestamp: 1755462723 Update sde action to 2.4, switch to 9.33.0 older version no longer downloadable. closes https://github.com/official-stockfish/Stockfish/pull/6240 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: Daniel Monroe
Date: Sat Aug 16 12:12:07 2025 +0200 Timestamp: 1755339127 Simplify dual bonuses Merge dual capture/quiet bonuses into one Passed simplification STC LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 223200 W: 57868 L: 57854 D: 107478 Elo +0.02 Ptnml(0-2): 689, 26441, 57296, 26515, 659 https://tests.stockfishchess.org/tests/view/6898d28e0049e8ccef9d6384 Passed simplification LTC LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 147270 W: 37750 L: 37659 D: 71861 Elo +0.21 Ptnml(0-2): 84, 15869, 41633, 15970, 79 https://tests.stockfishchess.org/tests/view/68990fe30049e8ccef9d643c closes https://github.com/official-stockfish/Stockfish/pull/6226 Bench: 2996176 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: Sat Aug 16 12:06:00 2025 +0200 Timestamp: 1755338760 Simplify depth term in reductions Passed simplification STC LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 317344 W: 82352 L: 82442 D: 152550 Elo -0.10 Ptnml(0-2): 999, 37395, 81907, 37439, 932 https://tests.stockfishchess.org/tests/live_elo/68976798f8a258623dda6c46 Passed simplification LTC LLR: 2.97 (-2.94,2.94) <-1.75,0.25> Total: 291708 W: 74733 L: 74787 D: 142188 Elo -0.06 Ptnml(0-2): 159, 31813, 81956, 31775, 151 https://tests.stockfishchess.org/tests/live_elo/689791a5f8a258623dda6d03 closes https://github.com/official-stockfish/Stockfish/pull/6225 Bench: 2436991 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: Kevin Lu
Date: Sat Aug 16 12:01:19 2025 +0200 Timestamp: 1755338479 Remove completedDepth condition for SE Just removing the term Passed STC: LLR: 3.27 (-2.94,2.94) <-1.75,0.25> Total: 179840 W: 47211 L: 47126 D: 85503 Elo +0.16 Ptnml(0-2): 567, 17929, 52879, 17942, 603 https://tests.stockfishchess.org/tests/view/688bdd88502b34dd5e7111ea Passed LTC: LLR: 3.26 (-2.94,2.94) <-1.75,0.25> Total: 150708 W: 38738 L: 38637 D: 73333 Elo +0.23 Ptnml(0-2): 79, 12922, 49262, 13001, 90 https://tests.stockfishchess.org/tests/view/688ce857f17748b4d23c8026 Passed VLTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 288312 W: 74104 L: 74152 D: 140056 Elo -0.06 Ptnml(0-2): 44, 26732, 90657, 26674, 49 https://tests.stockfishchess.org/tests/view/688ec4f57d68fe4f7f130ee3 closes https://github.com/official-stockfish/Stockfish/pull/6221 functional at higher depths Bench: 3002300 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 for modern computers Windows x64 + SSSE3 Windows x64 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64 | Author: FauziAkram
Date: Sat Aug 16 11:57:44 2025 +0200 Timestamp: 1755338264 Simplify beta formula Passed STC: LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 152384 W: 39907 L: 39814 D: 72663 Elo +0.21 Ptnml(0-2): 557, 17958, 39053, 18083, 541 https://tests.stockfishchess.org/tests/view/6890b66692fcad741b804a10 Passed LTC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 98688 W: 25411 L: 25270 D: 48007 Elo +0.50 Ptnml(0-2): 45, 10692, 27743, 10805, 59 https://tests.stockfishchess.org/tests/view/6896019c618946ab878347b0 closes: https://github.com/official-stockfish/Stockfish/pull/6220 bench: 3002300 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 for modern computers Windows x64 + SSSE3 Windows x64 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64 | Author: Stefan Geschwentner
Date: Sat Aug 16 11:51:39 2025 +0200 Timestamp: 1755337899 Add log depth as term to reduction factors. Replace most reduction factors with a linear term of the form X + Y * msb(depth) (using msb(depth) as simple and fast approximation for log(depth)) and tune the weights with following SPSA test: https://tests.stockfishchess.org/tests/view/689903860049e8ccef9d6415. Here the tuned values of X[8] and Y[8] were ignored because a simple test with this parameters alone failed badly (https://tests.stockfishchess.org/tests/view/68992b350049e8ccef9d6482). 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 closes https://github.com/official-stockfish/Stockfish/pull/6229 Bench: 3151102 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: Sat Aug 16 11:46:39 2025 +0200 Timestamp: 1755337599 Avoid using _mm512_storeu_epi16() gcc 9 & 10 do not provide this function, instead use the generic _mm512_storeu_si512 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95483 https://tests.stockfishchess.org/actions?max_actions=1&action=&user=&text=&before=1755266300.455175&run_id= closes https://github.com/official-stockfish/Stockfish/pull/6231 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: Jost Triller
Date: Sat Aug 9 09:08:38 2025 +0200 Timestamp: 1754723318 Adjust probcut on staticEval Reducing probcut depth more when staticEval is very good and less if staticEval is not so good compared to beta STC: https://tests.stockfishchess.org/tests/view/68926bf6690844f940fa1350 LLR: 2.98 (-2.94,2.94) <0.00,2.00> Total: 174400 W: 45698 L: 45174 D: 83528 Elo +1.04 Ptnml(0-2): 622, 20356, 44672, 20976, 574 LTC: https://tests.stockfishchess.org/tests/view/689651b4f8a258623dda6531 LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 56010 W: 14547 L: 14191 D: 27272 Elo +2.21 Ptnml(0-2): 31, 5929, 15738, 6267, 40 This patch was generated using qwen3-235b-a22b-thinking-2507: Prompt: https://rentry.co/bm6vriai Thinking: https://rentry.co/34km4zf8 Final respone: https://rentry.co/rauotrvr closes https://github.com/official-stockfish/Stockfish/pull/6219 Bench: 3629755 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 for modern computers Windows x64 + SSSE3 Windows x64 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64 | Author: FauziAkram
Date: Sat Aug 9 09:04:33 2025 +0200 Timestamp: 1754723073 Remove outdated comment Remove the Elo worth, as they are now completely outdated, making them irrelevant and potentially misleading Continuation of #5810 as these comments in "history.h" were missed. closes https://github.com/official-stockfish/Stockfish/pull/6216 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: Sat Aug 9 08:54:47 2025 +0200 Timestamp: 1754722487 Remove an instruction from find_nnz() closes https://github.com/official-stockfish/Stockfish/pull/6212 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: Niklas Fiekas
Date: Sat Aug 9 08:51:45 2025 +0200 Timestamp: 1754722305 Build x86-64-avx512icl in CI closes https://github.com/official-stockfish/Stockfish/pull/6217 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: Stockfisher69
Date: Sat Aug 9 08:49:12 2025 +0200 Timestamp: 1754722152 Simplification: Futility pruning for captures tested in final form as simplication passed LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 113682 W: 29199 L: 29074 D: 55409 Elo +0.38 Ptnml(0-2): 68, 12359, 31859, 12490, 65 https://tests.stockfishchess.org/tests/view/688e85a17d68fe4f7f130e24 earlier test, equivalent: passed STC: LLR: 2.96 (-2.94,2.94) <0.00,2.00> Total: 120224 W: 31621 L: 31176 D: 57427 Elo +1.29 Ptnml(0-2): 415, 14167, 30567, 14484, 479 https://tests.stockfishchess.org/tests/view/68888bdd7b562f5f7b732643 closes https://github.com/official-stockfish/Stockfish/pull/6209 Bench: 2661621 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: KazApps
Date: Sat Aug 9 08:43:49 2025 +0200 Timestamp: 1754721829 Separate bonus/malus parameters for quiet and capture moves Parameters were tuned on 60k STC games. Passed STC LLR: 2.95 (-2.94,2.94) <0.00,2.00> Total: 16928 W: 4570 L: 4277 D: 8081 Elo +6.01 Ptnml(0-2): 57, 1905, 4270, 2152, 80 https://tests.stockfishchess.org/tests/view/688b4486502b34dd5e711122 Passed LTC LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 43602 W: 11373 L: 11041 D: 21188 Elo +2.65 Ptnml(0-2): 23, 4657, 12116, 4975, 30 https://tests.stockfishchess.org/tests/view/688c0eb5502b34dd5e71124b Passed non-regression VLTC LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 181016 W: 46335 L: 46281 D: 88400 Elo +0.10 Ptnml(0-2): 33, 18177, 54034, 18231, 33 https://tests.stockfishchess.org/tests/view/688e0a77f17748b4d23c822b closes https://github.com/official-stockfish/Stockfish/pull/6200 bench: 3435529 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: rn5f107s2
Date: Mon Aug 4 15:16:21 2025 +0200 Timestamp: 1754313381 Only set ep square if ep capture is possible for positions such as: position fen rr6/2q2p1k/2P1b1pp/bB2P1n1/R2B2PN/p4P1P/P1Q4K/1R6 b - - 2 38 moves f7f5 position fen 8/p2r1pK1/6p1/1kp1P1P1/2p5/2P5/8/4R3 b - - 0 43 moves f7f5 position fen 4k3/4p3/2b3b1/3P1P2/4K3/8/8/8 b - - moves e7e5 ep is not possible for various reasons. Do not set the ep square and the do not change the zobrist key, as if ep were possible. This fixes 3-fold detection, which could in rare cases be observed as a warning generated by fastchess for PVs that continued beyond an actual 3-fold. Also fixes wrong evals for certain moves e.g. a2a1 for position fen 4k3/1b2p2b/8/3P1P2/4K3/8/8/r7 b - - 0 1 moves e7e5 e4e3 a1a2 e3e4 a2a1 e4f3 a1a2 f3e4 fixes https://github.com/official-stockfish/Stockfish/issues/6138 originally written and tested by rn5f107s2, with small buglet as https://tests.stockfishchess.org/tests/view/685af90843ce022d15794400 failed STC LLR: -2.93 (-2.94,2.94) <-1.75,0.25> Total: 130688 W: 33986 L: 34362 D: 62340 Elo -1.00 Ptnml(0-2): 414, 13292, 38302, 12928, 408 https://tests.stockfishchess.org/tests/view/688bcb35502b34dd5e7111c9 passed LTC LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 99018 W: 25402 L: 25273 D: 48343 Elo +0.45 Ptnml(0-2): 54, 9097, 31089, 9204, 65 https://tests.stockfishchess.org/tests/view/688c613c502b34dd5e7112d3 https://github.com/official-stockfish/Stockfish/pull/6211 Bench: 2946135 Co-authored-by: Joost VandeVondele <> see source |