| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: protonspring
Date: Thu Apr 2 14:40:03 2020 +0200 Timestamp: 1585831203 Limit array access in Position This is a non-functional code style change that routes all position array accesses to single methods, and adds an assert to check correctness. Passed STC LLR: 2.94 (-2.94,2.94) {-1.50,0.50} Total: 37312 W: 7378 L: 7246 D: 22688 Elo +1.23 Ptnml(0-2): 606, 4280, 8762, 4392, 616 https://tests.stockfishchess.org/tests/view/5e7c0c69e42a5c3b3ca2eb3d closes https://github.com/official-stockfish/Stockfish/pull/2595 No functional change. see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: Joost VandeVondele
Date: Mon Mar 30 22:46:07 2020 +0200 Timestamp: 1585601167 Small cleanups https://github.com/official-stockfish/Stockfish/pull/2584 No functional change. see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: Praveen tummala
Date: Mon Mar 30 22:41:22 2020 +0200 Timestamp: 1585600882 Movecount pruning reduction logic This patch refines search reduction logic in case the position is not a former PV node and is pruned based on move count. passed STC https://tests.stockfishchess.org/tests/view/5e8092bde42a5c3b3ca2ed35 LLR: 2.94 (-2.94,2.94) {-0.50,1.50} Total: 78848 W: 15480 L: 15170 D: 48198 Elo +1.37 Ptnml(0-2): 1406, 9310, 17773, 9438, 1497 passed LTC https://tests.stockfishchess.org/tests/view/5e80bb13e42a5c3b3ca2ed4b LLR: 2.94 (-2.94,2.94) {0.25,1.75} Total: 86596 W: 11451 L: 11033 D: 64112 Elo +1.68 Ptnml(0-2): 624, 7993, 25687, 8329, 665 closes https://github.com/official-stockfish/Stockfish/pull/2605 Bench: 5138771 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: Vizvezdenec
Date: Sun Mar 29 19:48:01 2020 +0200 Timestamp: 1585504081 Count only the most advanced passed pawn for each file. This patch adjusts definition of passed pawns - if there is a pawn of our color in the same file in front of a current pawn it's no longer counts as passed. passed STC https://tests.stockfishchess.org/tests/view/5e802037e42a5c3b3ca2ed07 LLR: 2.94 (-2.94,2.94) {-0.50,1.50} Total: 215296 W: 41843 L: 41341 D: 132112 Elo +0.81 Ptnml(0-2): 3688, 25313, 49304, 25495, 3848 passed LTC https://tests.stockfishchess.org/tests/view/5e806441e42a5c3b3ca2ed2b LLR: 2.95 (-2.94,2.94) {0.25,1.75} Total: 74050 W: 9761 L: 9379 D: 54910 Elo +1.79 Ptnml(0-2): 510, 6838, 22025, 7064, 588 closes https://github.com/official-stockfish/Stockfish/pull/2602 bench: 4902237 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: xoto10
Date: Sun Mar 29 19:44:07 2020 +0200 Timestamp: 1585503847 Remove previousScore adjustment of delta. STC: LLR: 2.95 (-2.94,2.94) {-1.50,0.50} Total: 14580 W: 2904 L: 2731 D: 8945 Elo +4.12 Ptnml(0-2): 243, 1665, 3339, 1762, 281 https://tests.stockfishchess.org/tests/view/5e7d080ae42a5c3b3ca2ebc6 LTC: LLR: 2.95 (-2.94,2.94) {-1.50,0.50} Total: 60338 W: 7870 L: 7831 D: 44637 Elo +0.22 Ptnml(0-2): 451, 5596, 18018, 5671, 433 https://tests.stockfishchess.org/tests/view/5e7d11b3e42a5c3b3ca2ebd3 closes https://github.com/official-stockfish/Stockfish/pull/2598 Bench 5247262 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: Lyudmil Antonov
Date: Thu Mar 26 17:49:28 2020 +0100 Timestamp: 1585241368 Tuned history reduction Value after a long Bayesian tuning, using a home-made classification approach. STC https://tests.stockfishchess.org/tests/view/5e7c7b16e42a5c3b3ca2eb66 LLR: 2.96 (-2.94,2.94) {-0.50,1.50} Total: 45472 W: 8992 L: 8732 D: 27748 Elo +1.99 Ptnml(0-2): 795, 5276, 10352, 5500, 813 LTC https://tests.stockfishchess.org/tests/view/5e7c8be7e42a5c3b3ca2eb75 LLR: 2.94 (-2.94,2.94) {0.25,1.75} Total: 22744 W: 3085 L: 2849 D: 16810 Elo +3.61 Ptnml(0-2): 156, 2090, 6658, 2298, 170 closes https://github.com/official-stockfish/Stockfish/pull/2597 Bench 5030855 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: xoto10
Date: Thu Mar 26 17:46:51 2020 +0100 Timestamp: 1585241211 Remove passed_count from almostUnwinnable. This simplification allows the almostUnwinnable flag to match endgames where the pawns are all on the same flank but are not symmetrical. STC: LLR: 2.94 (-2.94,2.94) {-1.50,0.50} Total: 23356 W: 4543 L: 4395 D: 14418 Elo +2.20 Ptnml(0-2): 346, 2651, 5582, 2707, 392 https://tests.stockfishchess.org/tests/view/5e7b8f57e42a5c3b3ca2eb09 LTC: LLR: 2.96 (-2.94,2.94) {-1.50,0.50} Total: 31778 W: 4097 L: 4023 D: 23658 Elo +0.81 Ptnml(0-2): 199, 2853, 9729, 2891, 217 https://tests.stockfishchess.org/tests/view/5e7ba5ade42a5c3b3ca2eb16 closes https://github.com/official-stockfish/Stockfish/pull/2596 Bench 4777139 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: protonspring
Date: Wed Mar 25 21:42:33 2020 +0100 Timestamp: 1585168953 Remove KNPKB endgame. This is a functional simplification that removes the KNPKB endgame. Testing on only KNPKB positions suggests that this removal actually gains Elo: Score of patch vs master: 3380 - 3035 - 33585 [0.504] 40000 Elo difference: 3.0 +/- 1.4, LOS: 100.0 %, DrawRatio: 84.0 % Score of patch vs master: 290 - 36 - 39674 [0.503] 40000 Elo difference: 2.2 +/- 0.3, LOS: 100.0 %, DrawRatio: 99.2 % removal also doesn't cause a regression with the standard book: STC LLR: 2.95 (-2.94,2.94) {-1.50,0.50} Total: 71376 W: 13794 L: 13719 D: 43863 Elo +0.37 Ptnml(0-2): 1066, 8092, 17290, 8181, 1059 https://tests.stockfishchess.org/tests/view/5e76c3d5e42a5c3b3ca2e8be LTC LLR: 2.95 (-2.94,2.94) {-1.50,0.50} Total: 28394 W: 3731 L: 3662 D: 21001 Elo +0.84 Ptnml(0-2): 167, 2339, 9116, 2408, 167 https://tests.stockfishchess.org/tests/view/5e76e5eae42a5c3b3ca2e8d3 closes https://github.com/official-stockfish/Stockfish/pull/2594 Bench 5480811 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: Vizvezdenec
Date: Fri Mar 20 21:07:37 2020 +0100 Timestamp: 1584734857 Adjust singular extension search depth This patch applies a different singular extension search logic in case the position is ttPv && !PvNode. It changes the depth of this search, higher for this types of nodes, and lower for other nodes. passed STC http://tests.stockfishchess.org/tests/view/5e72bbaae42a5c3b3ca2e75e LLR: 2.94 (-2.94,2.94) {-0.50,1.50} Total: 12692 W: 2608 L: 2389 D: 7695 Elo +6.00 Ptnml(0-2): 238, 1414, 2839, 1601, 254 passed LTC http://tests.stockfishchess.org/tests/view/5e731c07e42a5c3b3ca2e770 LLR: 2.96 (-2.94,2.94) {0.25,1.75} Total: 145716 W: 19218 L: 18626 D: 107872 Elo +1.41 Ptnml(0-2): 1100, 13605, 42899, 14111, 1143 closes https://github.com/official-stockfish/Stockfish/pull/2590 Bench: 5398277 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: Vizvezdenec
Date: Tue Mar 17 19:34:47 2020 +0100 Timestamp: 1584470087 Adjust singular LMR for positions seen in PV This patch continues work on altering search for ttPv nodes, using recent idea to alter it more in not PvNodes. Previous tweak based on this idea adjusted singularBeta - this one adjusts value of singularLMR, so they are both related to singular extension search. passed STC http://tests.stockfishchess.org/tests/view/5e700737e42a5c3b3ca2e659 LLR: 2.95 (-2.94,2.94) {-0.50,1.50} Total: 140608 W: 27053 L: 26659 D: 86896 Elo +0.97 Ptnml(0-2): 2425, 16337, 32439, 16625, 2478 passed LTC http://tests.stockfishchess.org/tests/view/5e7068eae42a5c3b3ca2e687 LLR: 2.94 (-2.94,2.94) {0.25,1.75} Total: 79318 W: 10463 L: 10064 D: 58791 Elo +1.75 Ptnml(0-2): 567, 7416, 23359, 7685, 632 closes https://github.com/official-stockfish/Stockfish/pull/2588 Bench: 4952322 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: Stéphane Nicolet
Date: Tue Mar 17 19:20:37 2020 +0100 Timestamp: 1584469237 Anchored bishops Reduce the "bad bishop" penalty when the bishop is protected by one of our pawns, as it may indicate that the bishop has found a safe spot outside the pawn chain. STC: LLR: 2.94 (-2.94,2.94) {-0.50,1.50} Total: 176942 W: 34142 L: 33696 D: 109104 Elo +0.88 Ptnml(0-2): 3129, 20422, 40919, 20876, 3125 http://tests.stockfishchess.org/tests/view/5e6f61aae42a5c3b3ca2e62d LTC: LLR: 2.95 (-2.94,2.94) {0.25,1.75} Total: 42252 W: 5615 L: 5322 D: 31315 Elo +2.41 Ptnml(0-2): 308, 3881, 12500, 4084, 353 http://tests.stockfishchess.org/tests/view/5e701382e42a5c3b3ca2e661 closes https://github.com/official-stockfish/Stockfish/pull/2587 Bench: 4963440 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: Joost VandeVondele
Date: Sat Mar 14 17:04:50 2020 +0100 Timestamp: 1584201890 Small cleanups closes https://github.com/official-stockfish/Stockfish/pull/2567 No functional change. see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: pb00067
Date: Sat Mar 14 16:30:17 2020 +0100 Timestamp: 1584199817 Simplify futility pruning parent node only continuation histories seem needed for this purpose. STC: http://tests.stockfishchess.org/tests/view/5e6b88dfe42a5c3b3ca2e4ab LLR: 2.94 (-2.94,2.94) {-1.50,0.50} Total: 113356 W: 21725 L: 21696 D: 69935 Elo +0.09 Ptnml(0-2): 1999, 13255, 26163, 13240, 2021 LTC: http://tests.stockfishchess.org/tests/view/5e6babbfe42a5c3b3ca2e4c2 LLR: 2.94 (-2.94,2.94) {-1.50,0.50} Total: 22164 W: 2917 L: 2821 D: 16426 Elo +1.50 Ptnml(0-2): 173, 2040, 6548, 2160, 161 closes https://github.com/official-stockfish/Stockfish/pull/2583 bench: 4839496 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: protonspring
Date: Sat Mar 14 16:27:54 2020 +0100 Timestamp: 1584199674 simplify castling part of generate_all. somewhat more compact, generates same code. close https://github.com/official-stockfish/Stockfish/pull/2580 No functional change. see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: silversolver1
Date: Mon Mar 9 22:46:13 2020 +0100 Timestamp: 1583790373 Remove set statScore to zero Simplification. Removes setting statScore to zero if negative. STC: LLR: 2.95 (-2.94,2.94) {-1.50,0.50} Total: 84820 W: 16100 L: 16033 D: 52687 Elo +0.27 Ptnml(0-2): 1442, 9865, 19723, 9944, 1436 https://tests.stockfishchess.org/tests/view/5e654fdae42a5c3b3ca2e2f8 LTC: LLR: 2.94 (-2.94,2.94) {-1.50,0.50} Total: 57658 W: 7435 L: 7391 D: 42832 Elo +0.27 Ptnml(0-2): 441, 5397, 17104, 5451, 436 https://tests.stockfishchess.org/tests/view/5e657ce9e42a5c3b3ca2e307 closes https://github.com/official-stockfish/Stockfish/pull/2578 Bench: 5168890 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: protonspring
Date: Mon Mar 9 22:16:26 2020 +0100 Timestamp: 1583788586 Equations for edges and corners. This is a functional simplification that removes the large arrays in endgames.cpp. It also fixes a recently introduced bug (960d59d54143d84aab26deae65279a611fc989f4) in KNBvK, now using flip_file() instead of ~. One fen added to bench to increase endgame coverage. STC LLR: 2.94 (-2.94,2.94) {-1.50,0.50} Total: 174724 W: 33325 L: 33404 D: 107995 Elo -0.16 Ptnml(0-2): 2503, 19607, 43181, 19608, 2463 http://tests.stockfishchess.org/tests/view/5e6448ffe42a5c3b3ca2e287 LTC LLR: 2.95 (-2.94,2.94) {-1.50,0.50} Total: 35640 W: 4679 L: 4621 D: 26340 Elo +0.57 Ptnml(0-2): 189, 2991, 11424, 3005, 211 http://tests.stockfishchess.org/tests/view/5e650b24e42a5c3b3ca2e2d8 closes https://github.com/official-stockfish/Stockfish/pull/2577 Bench: 5527957 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: Gary Heckman
Date: Sat Mar 7 11:14:27 2020 +0100 Timestamp: 1583576067 Fix ambiguity between clamp implementations There is an ambiguity between global and std clamp implementations when compiling in c++17, and on certain toolchains that are not strictly conforming to c++11. This is solved by putting our clamp implementation in a namespace. closes https://github.com/official-stockfish/Stockfish/pull/2572 No functional change. see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: protonspring
Date: Sat Mar 7 11:09:38 2020 +0100 Timestamp: 1583575778 Remove KRPPKRPScaleFactors array Fucntional simplification that removes the KRPPKRPScaleFactors array. STC LLR: 2.94 (-2.94,2.94) {-1.50,0.50} Total: 47374 W: 9159 L: 9049 D: 29166 Elo +0.81 Ptnml(0-2): 707, 5325, 11560, 5341, 754 http://tests.stockfishchess.org/tests/view/5e5ff464e42a5c3b3ca2e156 LTC LLR: 2.95 (-2.94,2.94) {-1.50,0.50} Total: 31268 W: 4064 L: 3995 D: 23209 Elo +0.77 Ptnml(0-2): 173, 2734, 9764, 2777, 186 http://tests.stockfishchess.org/tests/view/5e61be6ce42a5c3b3ca2e1c1 closes https://github.com/official-stockfish/Stockfish/pull/2575 Bench 5123316 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: protonspring
Date: Sat Mar 7 10:55:15 2020 +0100 Timestamp: 1583574915 Cleanup KBPsK endgame * Clarify distinction between strong side pawns and all pawns. * Simplify and speed-up determination of pawns on the same file. * Clarify comments. * more_than_one() is probably faster than pos.count. Passed STC: LLR: 2.95 (-2.94,2.94) {-1.50,0.50} Total: 40696 W: 7856 L: 7740 D: 25100 Elo +0.99 Ptnml(0-2): 584, 4519, 10054, 4579, 612 http://tests.stockfishchess.org/tests/view/5e6153b1e42a5c3b3ca2e1a9 closes https://github.com/official-stockfish/Stockfish/pull/2574 No functional change. see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: protonspring
Date: Sat Mar 7 10:48:16 2020 +0100 Timestamp: 1583574496 Small speed-up in BetweenBB A speed-up removing some comparisons. closes https://github.com/official-stockfish/Stockfish/pull/2571 No functional change. see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: protonspring
Date: Wed Mar 4 07:17:04 2020 +0100 Timestamp: 1583302624 Use equations for PushAway and PushClose A functional simplification replacing the corresponding arrays. Tested in two variants, also the simpler one performs well, even though differences to master should be minimal. STC LLR: 2.95 (-2.94,2.94) {-1.50,0.50} Total: 57864 W: 11092 L: 11001 D: 35771 Elo +0.55 Ptnml(0-2): 826, 6458, 14320, 6455, 873 http://tests.stockfishchess.org/tests/view/5e5da5b6e42a5c3b3ca2e05c LTC LLR: 2.95 (-2.94,2.94) {-1.50,0.50} Total: 7198 W: 982 L: 883 D: 5333 Elo +4.78 Ptnml(0-2): 33, 575, 2296, 650, 45 http://tests.stockfishchess.org/tests/view/5e5df13ae42a5c3b3ca2e077 LTC (This exact version. . . more simplified) LLR: 2.95 (-2.94,2.94) {-1.50,0.50} Total: 5392 W: 729 L: 631 D: 4032 Elo +6.32 Ptnml(0-2): 23, 405, 1751, 485, 32 http://tests.stockfishchess.org/tests/view/5e5ead99e42a5c3b3ca2e0e4 closes https://github.com/official-stockfish/Stockfish/pull/2570 Bench 5123316 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: protonspring
Date: Wed Mar 4 07:11:48 2020 +0100 Timestamp: 1583302308 Consolidate Square Flipping Add a flip_rank() and flip_file() so that all of the square flipping can be consolidated. STC LLR: 2.94 (-2.94,2.94) {-1.50,0.50} Total: 57234 W: 11064 L: 10969 D: 35201 Elo +0.58 Ptnml(0-2): 822, 6562, 13801, 6563, 869 http://tests.stockfishchess.org/tests/view/5e5d2f2aafe6254521f2ffaa closes https://github.com/official-stockfish/Stockfish/pull/2568 No functional change. see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: Joost VandeVondele
Date: Sun Mar 1 09:31:58 2020 +0100 Timestamp: 1583051518 Small cleanups closes https://github.com/official-stockfish/Stockfish/pull/2546 No functional change. see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: Guenther Demetz
Date: Sun Mar 1 09:20:31 2020 +0100 Timestamp: 1583050831 Simplify lowply-history logic Don't restrict usage to ttPv nodes exclusively STC: http://tests.stockfishchess.org/tests/view/5e5634f284a82b4acd41499a LLR: 2.94 (-2.94,2.94) {-1.50,0.50} Total: 152796 W: 29146 L: 29178 D: 94472 Elo -0.07 Ptnml(0-2): 2590, 17792, 35628, 17836, 2552 LTC: http://tests.stockfishchess.org/tests/view/5e575d4984a82b4acd4149e8 LLR: 2.95 (-2.94,2.94) {-1.50,0.50} Total: 20078 W: 2688 L: 2587 D: 14803 Elo +1.75 Ptnml(0-2): 139, 1914, 5853, 1973, 160 closes https://github.com/official-stockfish/Stockfish/pull/2565 bench: 4923286 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers Linux x64 | Author: Moez Jellouli
Date: Thu Feb 27 13:14:51 2020 +0100 Timestamp: 1582805691 Weak queen protection Extra penalty if weak piece is only protected by a queen. STC: http://tests.stockfishchess.org/tests/view/5e53c6ab84a82b4acd4148fa LLR: 2.96 (-2.94,2.94) {-0.50,1.50} Total: 44630 W: 8615 L: 8359 D: 27656 Elo +1.99 Ptnml(0-2): 746, 5156, 10323, 5276, 814 LTC: http://tests.stockfishchess.org/tests/view/5e54e05d84a82b4acd414947 LLR: 2.94 (-2.94,2.94) {0.25,1.75} Total: 175480 W: 23085 L: 22409 D: 129986 Elo +1.34 Ptnml(0-2): 1264, 16494, 51678, 16910, 1394 closes https://github.com/official-stockfish/Stockfish/pull/2564 Bench: 4923286 see source |