| !! 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: Sat Jan 18 21:33:17 2025 +0100 Timestamp: 1737232397 Replace depth increase condition with !opponentWorsening Passed simplification STC LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 220544 W: 57417 L: 57399 D: 105728 Elo +0.03 Ptnml(0-2): 816, 26554, 55540, 26520, 842 https://tests.stockfishchess.org/tests/view/678970e38082388fa0cbfe02 Passed simplification LTC LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 132600 W: 33868 L: 33760 D: 64972 Elo +0.28 Ptnml(0-2): 126, 14770, 36390, 14898, 116 https://tests.stockfishchess.org/tests/view/678accabc00c743bc9e9fc7f closes https://github.com/official-stockfish/Stockfish/pull/5798 bench 1632964 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: Daniel Monroe
Date: Sat Jan 18 21:27:42 2025 +0100 Timestamp: 1737232062 Refine probcut Allow probcut for depth 3 and disable deeper verification search when it would simply repeat the qsearch. Passed STC LLR: 2.93 (-2.94,2.94) <0.00,2.00> Total: 283232 W: 74450 L: 73760 D: 135022 Elo +0.85 Ptnml(0-2): 1052, 33780, 71349, 34296, 1139 https://tests.stockfishchess.org/tests/view/67843b58460e2910c51ddcc6 Passed LTC LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 339654 W: 86845 L: 85893 D: 166916 Elo +0.97 Ptnml(0-2): 298, 37734, 92802, 38704, 289 https://tests.stockfishchess.org/tests/view/678aa722c00c743bc9e9face closes https://github.com/official-stockfish/Stockfish/pull/5797 bench 1288648 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 Jan 18 21:24:01 2025 +0100 Timestamp: 1737231841 tuned TM values Tuned 70k games at 240+2.4 th 2: https://tests.stockfishchess.org/tests/view/6783b1b16ddf09c0b4b703f5 Failed STC: LLR: -2.93 (-2.94,2.94) <0.00,2.00> Total: 491872 W: 128260 L: 127804 D: 235808 Elo +0.32 Ptnml(0-2): 1579, 55449, 131572, 55609, 1727 https://tests.stockfishchess.org/tests/view/6785a045460e2910c51de4b8 Passed LTC: LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 154824 W: 39315 L: 38874 D: 76635 Elo +0.99 Ptnml(0-2): 110, 15809, 45147, 16222, 124 https://tests.stockfishchess.org/tests/view/678ac722c00c743bc9e9fc35 Passed VLTC: LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 77404 W: 19825 L: 19452 D: 38127 Elo +1.67 Ptnml(0-2): 18, 7262, 23765, 7643, 14 https://tests.stockfishchess.org/tests/view/678b2a98c00c743bc9ea048c closes https://github.com/official-stockfish/Stockfish/pull/5796 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: FauziAkram
Date: Sat Jan 18 21:18:48 2025 +0100 Timestamp: 1737231528 Moving up the if position is or has been on the PV reduction Passed STC: LLR: 2.93 (-2.94,2.94) <0.00,2.00> Total: 29664 W: 7880 L: 7570 D: 14214 Elo +3.63 Ptnml(0-2): 93, 3487, 7390, 3741, 121 https://tests.stockfishchess.org/tests/view/678ac957c00c743bc9e9fc3f Passed LTC: LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 81354 W: 20903 L: 20487 D: 39964 Elo +1.78 Ptnml(0-2): 66, 9003, 22123, 9419, 66 https://tests.stockfishchess.org/tests/view/678ad359c00c743bc9e9fcfa closes https://github.com/official-stockfish/Stockfish/pull/5794 Bench: 1414638 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 Jan 18 21:13:12 2025 +0100 Timestamp: 1737231192 Optimize find_nnz() by reducing the size of lookup_indices https://tests.stockfishchess.org/tests/view/67896b688082388fa0cbfdee LLR: 2.93 (-2.94,2.94) <0.00,2.00> Total: 452800 W: 118213 L: 117300 D: 217287 Elo +0.70 Ptnml(0-2): 1638, 50255, 121864, 50842, 1801 It's faster to shrink lookup_indices[] to 8 bit and zero extend to 16 bit using _mm_cvtepu8_epi16() than to read the larger 16 bit version. I suspect that having the constants available at compile time isn't too valuable and can be simplified back to generating at initialization time since this version also almost passed. https://tests.stockfishchess.org/tests/view/67863057460e2910c51de7e0 I will try that as a follow up. closes https://github.com/official-stockfish/Stockfish/pull/5793 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: Michael Chaly
Date: Sat Jan 18 21:04:55 2025 +0100 Timestamp: 1737230695 Introduce one more continuation history This one is counter counter counter history - with really low update value and divided by 3 in movepicker unlike the other ones. Passed STC: https://tests.stockfishchess.org/tests/view/67861495460e2910c51de720 LLR: 2.93 (-2.94,2.94) <0.00,2.00> Total: 44352 W: 11699 L: 11370 D: 21283 Elo +2.58 Ptnml(0-2): 156, 5098, 11361, 5383, 178 Passed LTC: https://tests.stockfishchess.org/tests/view/6786e89e3b8f206a2696b646 LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 432660 W: 110355 L: 109207 D: 213098 Elo +0.92 Ptnml(0-2): 381, 48214, 118039, 49268, 428 closes https://github.com/official-stockfish/Stockfish/pull/5792 Bench: 1491837 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: Nonlinear2
Date: Sat Jan 18 21:02:04 2025 +0100 Timestamp: 1737230524 Increase history bonus of TT moves Passed STC: https://tests.stockfishchess.org/tests/view/678807653b8f206a2696b78b LLR: 2.96 (-2.94,2.94) <0.00,2.00> Total: 42208 W: 11113 L: 10783 D: 20312 Elo +2.72 Ptnml(0-2): 148, 4919, 10651, 5227, 159 Passed LTC: https://tests.stockfishchess.org/tests/view/6788a8463b8f206a2696b956 LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 122886 W: 31454 L: 30952 D: 60480 Elo +1.42 Ptnml(0-2): 105, 13567, 33619, 14025, 127 closes https://github.com/official-stockfish/Stockfish/pull/5791 Bench: 1760081 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: Sat Jan 18 20:58:41 2025 +0100 Timestamp: 1737230321 Remove the cap from maxscale for x moves in y seconds TC Passed STC 40/10: LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 48800 W: 13044 L: 12835 D: 22921 Elo +1.49 Ptnml(0-2): 229, 5457, 12863, 5578, 273 https://tests.stockfishchess.org/tests/view/67862dae460e2910c51de7c9 Passed LTC 40/40: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 141296 W: 36110 L: 36014 D: 69172 Elo +0.24 Ptnml(0-2): 222, 14350, 41440, 14382, 254 https://tests.stockfishchess.org/tests/view/678799903b8f206a2696b6f8 Passed STC 80/8: LLR: 2.99 (-2.94,2.94) <-1.75,0.25> Total: 155120 W: 41442 L: 41346 D: 72332 Elo +0.22 Ptnml(0-2): 953, 17232, 41102, 17312, 961 https://tests.stockfishchess.org/tests/view/678aca4dc00c743bc9e9fc47 Passed LTC 80/60: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 93950 W: 24042 L: 23904 D: 46004 Elo +0.51 Ptnml(0-2): 80, 9020, 28627, 9178, 70 https://tests.stockfishchess.org/tests/view/678af705c00c743bc9e9fe94 closes https://github.com/official-stockfish/Stockfish/pull/5790 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: ppigazzini
Date: Sat Jan 18 20:56:23 2025 +0100 Timestamp: 1737230183 Return stockfish-macos-m1-apple-silicon.tar https://github.com/[ppigazzini/stockfish-downloader now uses the official SF script for POSIX systems. closes https://github.com/official-stockfish/Stockfish/pull/5789 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: Sat Jan 18 20:54:55 2025 +0100 Timestamp: 1737230095 simplify razoring Passed Non-regression STC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 93056 W: 24215 L: 24054 D: 44787 Elo +0.60 Ptnml(0-2): 364, 11085, 23470, 11244, 365 https://tests.stockfishchess.org/tests/view/67883a5d3b8f206a2696b804 Passed Non-regression LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 66564 W: 16971 L: 16794 D: 32799 Elo +0.92 Ptnml(0-2): 56, 7403, 18192, 7570, 61 https://tests.stockfishchess.org/tests/view/6789ffa78082388fa0cbfe95 closes https://github.com/official-stockfish/Stockfish/pull/5788 bench 1500649 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 Jan 18 20:52:07 2025 +0100 Timestamp: 1737229927 Update CI to Ubuntu 22.04 from 20.04 fixes #5756 closes https://github.com/official-stockfish/Stockfish/pull/5786 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: Daniel Monroe
Date: Sat Jan 18 20:50:04 2025 +0100 Timestamp: 1737229804 retroactive reduction decrease if eval improves If the previous reduction was large but the static eval improves then increase the search depth. This patch looks at the next node when calculating the reduction, something I don't think has been done before and which can probably used for further elo gaining patches. Passed STC LLR: 2.93 (-2.94,2.94) <0.00,2.00> Total: 55936 W: 14813 L: 14462 D: 26661 Elo +2.18 Ptnml(0-2): 220, 6565, 14094, 6822, 267 https://tests.stockfishchess.org/tests/view/67845b70460e2910c51ddcff Passed LTC LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 189468 W: 48411 L: 47773 D: 93284 Elo +1.17 Ptnml(0-2): 180, 20801, 52131, 21445, 177 https://tests.stockfishchess.org/tests/view/6784e2cb460e2910c51ddf86 closes https://github.com/official-stockfish/Stockfish/pull/5785 bench: 1512884 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 Jan 18 20:44:04 2025 +0100 Timestamp: 1737229444 Remove the type of moved piece from the evasion capture movepick formula In the move generation the moves are generated in the order pawns, knight, bishops, rooks, queens and king. This follows increasing type_of(pos.moved_piece(m)) term, so in master a capturing was sorted after a capturing rook if the same piece was captured in evasion. Because we use a stable sorting method (stable means the order of elements with the same value are not changed) and generate the moves in the above order we do'nt need the removed term. Passed STC: LLR: 2.98 (-2.94,2.94) <-1.75,0.25> Total: 170560 W: 44222 L: 44148 D: 82190 Elo +0.15 Ptnml(0-2): 569, 18792, 46488, 18858, 573 https://tests.stockfishchess.org/tests/view/678530ee460e2910c51de21d closes https://github.com/official-stockfish/Stockfish/pull/5784 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: pb00067
Date: Sat Jan 18 20:35:46 2025 +0100 Timestamp: 1737228946 Simplify common hint for parent position Removes function hint_common_access_for_perspective together with it's comments, which weren't accurate anymore since merge of #5576 https://tests.stockfishchess.org/tests/view/6784c9cd460e2910c51dde39 LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 295104 W: 76702 L: 76765 D: 141637 Elo -0.07 Ptnml(0-2): 1031, 32135, 81249, 32140, 997 closes https://github.com/official-stockfish/Stockfish/pull/5780 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: Disservin
Date: Sat Jan 18 20:32:00 2025 +0100 Timestamp: 1737228720 Remove addition of 1ms to all timestamps The +1 was a quick fix to avoid the division by zero, a more correct approach is to use 1ms as the minimum reported timestamp to avoid a division by zero. Later timestamps no longer include an additional 1ms. closes https://github.com/official-stockfish/Stockfish/pull/5778 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: Disservin
Date: Sat Jan 18 20:30:44 2025 +0100 Timestamp: 1737228644 Fix Path to AUTHORS in CONTRIBUTING closes https://github.com/official-stockfish/Stockfish/pull/5777 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: Daniel Monroe
Date: Sat Jan 18 20:25:59 2025 +0100 Timestamp: 1737228359 remove eval== staticeval check in fut pruning Simplify corrplexity in futility margin Don't check that staticEval == eval when applying the corrplexity-based adjustment in futility pruning. Passed Simplification STC LLR: 2.96 (-2.94,2.94) <-1.75,0.25> Total: 121760 W: 31640 L: 31512 D: 58608 Elo +0.37 Ptnml(0-2): 349, 14400, 31289, 14458, 384 https://tests.stockfishchess.org/tests/view/6780c4109168c8bf30927777 Passed Simplification LTC LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 134772 W: 34245 L: 34140 D: 66387 Elo +0.27 Ptnml(0-2): 94, 14869, 37350, 14984, 89 https://tests.stockfishchess.org/tests/view/6782d6ea6ddf09c0b4b6dd36 closes https://github.com/official-stockfish/Stockfish/pull/5776 Bench: 1487627 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: Sat Jan 18 20:23:10 2025 +0100 Timestamp: 1737228190 Fix initialization of TTData. https://tests.stockfishchess.org/tests/view/6757757686d5ee47d9541de9 LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 151200 W: 39396 L: 39306 D: 72498 Elo +0.21 Ptnml(0-2): 445, 16404, 41781, 16556, 414 Discussed in more detail here #5766 closes https://github.com/official-stockfish/Stockfish/pull/5773 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: Sat Jan 18 20:19:53 2025 +0100 Timestamp: 1737227993 prefetch in do_move() this allows removing Position::key_after() STC LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 24960 W: 6556 L: 6336 D: 12068 Elo +3.06 Ptnml(0-2): 59, 2554, 7056, 2730, 81 LTC LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 115080 W: 29319 L: 29204 D: 56557 Elo +0.35 Ptnml(0-2): 51, 10736, 35864, 10825, 64 STC with 2MB hash LLR: 3.04 (-2.94,2.94) <-1.75,0.25> Total: 182176 W: 46998 L: 46932 D: 88246 Elo +0.13 Ptnml(0-2): 526, 19711, 50544, 19785, 522 LTC with 8MB hash LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 441180 W: 111557 L: 111746 D: 217877 Elo -0.15 Ptnml(0-2): 229, 39698, 140929, 39501, 233 closes https://github.com/official-stockfish/Stockfish/pull/5770 bench: 1379150 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 Jan 12 21:36:39 2025 +0100 Timestamp: 1736714199 Increase the depth margin Tested at VVLTC against the passed patches. Test 1 against PR5764 LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 167260 W: 43053 L: 42521 D: 81686 Elo +1.11 Ptnml(0-2): 7, 15272, 52542, 15800, 9 https://tests.stockfishchess.org/tests/view/6782ef196ddf09c0b4b6e780 Test 2 against PR5765 LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 300012 W: 77364 L: 76771 D: 145877 Elo +0.69 Ptnml(0-2): 22, 27555, 94256, 28154, 19 https://tests.stockfishchess.org/tests/view/678366446ddf09c0b4b7028c closes https://github.com/official-stockfish/Stockfish/pull/5768 Bench: 1379150 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: Viren6
Date: Sun Jan 12 21:36:39 2025 +0100 Timestamp: 1736714199 Introduce Correction History Quad Extensions Also modifies the double and triple extension margins with the correction history adjustment. STC Elo Estimate: Elo: -4.40 ± 1.4 (95%) LOS: 0.0% Total: 60000 W: 15230 L: 15990 D: 28780 Elo -4.40 Ptnml(0-2): 264, 7495, 15168, 6883, 190 nElo: -8.48 ± 2.8 (95%) PairsRatio: 0.91 https://tests.stockfishchess.org/tests/view/6783a3786ddf09c0b4b703a1 Passed 1st VVLTC: LLR: 2.95 (-2.94,2.94) <0.00,2.00> Total: 35736 W: 9354 L: 9088 D: 17294 Elo +2.59 Ptnml(0-2): 4, 3191, 11212, 3457, 4 https://tests.stockfishchess.org/tests/view/6783a3336ddf09c0b4b7039b Passed 2nd VVLTC: LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 36394 W: 9515 L: 9225 D: 17654 Elo +2.77 Ptnml(0-2): 1, 3271, 11364, 3559, 2 https://tests.stockfishchess.org/tests/view/678395e26ddf09c0b4b70345 closes https://github.com/official-stockfish/Stockfish/pull/5767 Bench: 1567166 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: Muzhen Gaming
Date: Sun Jan 12 21:36:31 2025 +0100 Timestamp: 1736714191 VVLTC Search Tune Values were tuned with 118k VVLTC games. Tested against #5764. Passed VVLTC 1st sprt: https://tests.stockfishchess.org/tests/view/678331226ddf09c0b4b6fd78 LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 43556 W: 11219 L: 10942 D: 21395 Elo +2.21 Ptnml(0-2): 2, 3975, 13549, 4248, 4 Passed VVLTC 2nd sprt: https://tests.stockfishchess.org/tests/view/67834aa06ddf09c0b4b6fe34 LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 37150 W: 9577 L: 9285 D: 18288 Elo +2.73 Ptnml(0-2): 2, 3344, 11593, 3632, 4 closes https://github.com/official-stockfish/Stockfish/pull/5765 Bench: 1258128 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 Jan 12 21:25:36 2025 +0100 Timestamp: 1736713536 Make IIR less aggressive This patch is an elo gaining simplification which gains elo at longer time controls. Patch disallows IIR for cutNodes with existing tt moves as well as makes IIR for pv nodes less aggressive, basiclally confirming suspected scaling patterns for this heuristic. Result of 50k games STC run: https://tests.stockfishchess.org/tests/view/678304676ddf09c0b4b6f9f9 Elo: -2.93 ± 1.6 (95%) LOS: 0.0% Total: 50000 W: 12718 L: 13140 D: 24142 Elo -2.93 Ptnml(0-2): 189, 6087, 12835, 5735, 154 nElo: -5.71 ± 3.0 (95%) PairsRatio: 0.94 Passed VVLTC SPRT with STC bounds: https://tests.stockfishchess.org/tests/view/6782eb1a6ddf09c0b4b6e6b0 LLR: 2.95 (-2.94,2.94) <0.00,2.00> Total: 150292 W: 38868 L: 38458 D: 72966 Elo +0.95 Ptnml(0-2): 19, 13890, 46907, 14322, 8 Passed VVLTC SPRT with LTC bounds: https://tests.stockfishchess.org/tests/view/6782d8d96ddf09c0b4b6df18 LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 153388 W: 39791 L: 39285 D: 74312 Elo +1.15 Ptnml(0-2): 13, 13924, 48311, 14436, 10 closes https://github.com/official-stockfish/Stockfish/pull/5763 Bench: 1507606 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: Sun Jan 12 21:24:44 2025 +0100 Timestamp: 1736713484 Optimize attackers_to() https://tests.stockfishchess.org/tests/view/6782decb6ddf09c0b4b6e1b0 LLR: 2.93 (-2.94,2.94) <0.00,2.00> Total: 105920 W: 27571 L: 27181 D: 51168 Elo +1.28 Ptnml(0-2): 284, 10808, 30403, 11164, 301 - If we only need to know if attackers exist we can skip some calculations. - Also calculating slider/magic attackers first is better because the double lookup is slow due to memory latency. - I also included a couple of very minor cleanups in search that probably don't warrant their own PR but I can open separately if that's better. closes https://github.com/official-stockfish/Stockfish/pull/5762 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: Shawn Xu
Date: Sun Jan 12 21:23:29 2025 +0100 Timestamp: 1736713409 Simplify away capthist bonus in Probcut The explicit bonus has been obsoleted with the introduction of #5695 Passed Non-regression STC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 132832 W: 34519 L: 34403 D: 63910 Elo +0.30 Ptnml(0-2): 430, 15754, 33931, 15872, 429 https://tests.stockfishchess.org/tests/view/678158c49168c8bf30927834 Passed Non-regression LTC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 123492 W: 31426 L: 31309 D: 60757 Elo +0.33 Ptnml(0-2): 79, 13705, 34051, 13842, 69 https://tests.stockfishchess.org/tests/view/6782b07e6ddf09c0b4b6dbb7 closes https://github.com/official-stockfish/Stockfish/pull/5761 Bench: 1180439 see source |