Latest abrok Development Version October 16th (SF The gift that keeps on giving

!! 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: Rodrigo Roim Date: Sun Oct 16 12:58:48 2022 +0200 Timestamp: 1665917928 Fix tablebase probe for dtz >1000 w/o 50 move rule For qn4N1/6R1/3K4/8/B2k4/8/8/8 w - - 0 1, white loses with DTZ 1034. See https://syzygy-tables.info/?fen=qn4N1/6R1/3K4/8/B2k4/8/8/8_w_-_-_0_1 Prior to this fix, due to a too small hard-coded value, Stockfish interpreted this as winning. The new value picked (1<<18) is large enough to deal with the largest DTZ values that can be stored in the current syzygy format. closes https://github.com/official-stockfish/Stockfish/pull/4187 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: xoto10 Date: Sun Oct 16 11:51:41 2022 +0200 Timestamp: 1665913901 Adjust timeman constants Adjust timeman constants to use more time in early part of game. STC @ 10+0.1 th 1 : LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 93984 W: 25177 L: 24787 D: 44020 Elo +1.44 Ptnml(0-2): 350, 10096, 25729, 10448, 369 https://tests.stockfishchess.org/tests/live_elo/6339077135f43d649ff6162a LTC @ 60+0.6 th 1 : LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 329368 W: 88953 L: 88093 D: 152322 Elo +0.91 Ptnml(0-2): 170, 31457, 100594, 32269, 194 https://tests.stockfishchess.org/tests/live_elo/6339baed35f43d649ff63142 Sudden death 10+0 : LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 20400 W: 5908 L: 5588 D: 8904 Elo +5.45 Ptnml(0-2): 177, 2252, 5128, 2360, 283 https://tests.stockfishchess.org/tests/live_elo/6347c9384bc7650f07549ba7 Sudden death 10+0, no adjudication : LLR: 2.96 (-2.94,2.94) <0.00,2.00> Total: 17920 W: 4755 L: 4442 D: 8723 Elo +6.07 Ptnml(0-2): 137, 1985, 4466, 2172, 200 https://tests.stockfishchess.org/tests/live_elo/634806e84bc7650f0754a639 closes https://github.com/official-stockfish/Stockfish/pull/4188 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: Stéphane Nicolet Date: Sun Oct 16 11:49:07 2022 +0200 Timestamp: 1665913747 Tweak the formula for NNUE complexity Joint work by Ofek Shochat and Stéphane Nicolet. passed STC: LLR: 2.95 (-2.94,2.94) <0.00,2.00> Total: 93288 W: 24996 L: 24601 D: 43691 Elo +1.47 Ptnml(0-2): 371, 10263, 24989, 10642, 379 https://tests.stockfishchess.org/tests/view/63448f4f4bc7650f07541987 passed LTC: LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 84168 W: 22771 L: 22377 D: 39020 Elo +1.63 Ptnml(0-2): 47, 8181, 25234, 8575, 47 https://tests.stockfishchess.org/tests/view/6345186d4bc7650f07542fbd ================ It seems there are two effects with this patch: effect A : If Stockfish is winning at root, we have optimism > 0 for all leaves in the search tree where Stockfish is to move. There, if (psq - nnue) > 0 (ie if the advantage is more materialistic than positional), then the product D = optimism * (psq - nnue) will be positive, nnueComplexity will increase, and the eval will increase from SF point of view. So the effect A is that if Stockfish is winning at root, she will slightly favor in the search tree (in other words, search more) the positions where she can convert her advantage via materialist means. effect B : If Stockfish is losing at root, we have optimism > 0 for all leaves in the search tree where the opponent is to move. There, if (psq - nnue) < 0 (ie if the opponent advantage is more positional than materialistic), then the product D = optimism * (psq-nnue) will be negative, nnueComplexity will decrease, and the eval will decrease from the opponent point of view. So the effect B is that Stockfish will slightly favor in the search tree (search more) the branches where she can defend by slowly reducing the opponent positional advantage. ================= closes https://github.com/official-stockfish/Stockfish/pull/4195 bench: 4673898 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: Dubslow Date: Sun Oct 16 11:45:16 2022 +0200 Timestamp: 1665913516 Remove depth condition from razoring The eval condition depends on depth anyways, so this patch is nearly (not quite) non-functional passed STC: https://tests.stockfishchess.org/tests/view/63428169fb7ccb2ea9be2629 LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 185992 W: 49612 L: 49558 D: 86822 Elo +0.10 Ptnml(0-2): 618, 19956, 51842, 19914, 666 passed LTC: https://tests.stockfishchess.org/tests/view/634418b14bc7650f07540760 LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 126816 W: 34147 L: 34043 D: 58626 Elo +0.28 Ptnml(0-2): 74, 11941, 39281, 12031, 81 closes https://github.com/official-stockfish/Stockfish/pull/4196 bench 4148700 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: Sun Oct 16 11:42:19 2022 +0200 Timestamp: 1665913339 Optimize make_index() using templates and lookup tables. https://tests.stockfishchess.org/tests/view/634517e54bc7650f07542f99 LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 642672 W: 171819 L: 170658 D: 300195 Elo +0.63 Ptnml(0-2): 2278, 68077, 179416, 69336, 2229 this also introduces `-flto-partition=one` as suggested by MinetaS (Syine Mineta) to avoid linking errors due to LTO on 32 bit mingw. This change was tested in isolation as well https://tests.stockfishchess.org/tests/view/634aacf84bc7650f0755188b LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 119352 W: 31986 L: 31862 D: 55504 Elo +0.36 Ptnml(0-2): 439, 12624, 33400, 12800, 413 closes https://github.com/official-stockfish/Stockfish/pull/4199 No functional change see source

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