| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 for modern computers Windows x64 + SSSE3 Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64 | Author: Gian-Carlo Pascutto
Date: Tue Sep 8 22:53:50 2020 +0200 Timestamp: 1599598430 Always re-enable NNUE after "bench". Restore the default NNUE setting (enabled) after a bench command. This also makes the resulting program settings independent of the number of FENs that are being benched. Fixes issue #3112. closes https://github.com/official-stockfish/Stockfish/pull/3113 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 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64 | Author: syzygy1
Date: Tue Sep 8 22:53:17 2020 +0200 Timestamp: 1599598397 Bug fix in do_null_move() and NNUE simplification. This fixes #3108 and removes some NNUE code that is currently not used. At the moment, do_null_move() copies the accumulator from the previous state into the new state, which is correct. It then clears the "computed_score" flag because the side to move has changed, and with the other side to move NNUE will return a completely different evaluation (normally with changed sign but also with different NNUE-internal tempo bonus). The problem is that do_null_move() clears the wrong flag. It clears the computed_score flag of the old state, not of the new state. It turns out that this almost never affects the search. For example, fixing it does not change the current bench (but it does change the previous bench). This is because the search code usually avoids calling evaluate() after a null move. This PR corrects do_null_move() by removing the computed_score flag altogether. The flag is not needed because nnue_evaluate() is never called twice on a position. This PR also removes some unnecessary {}s and inserts a few blank lines in the modified NNUE files in line with SF coding style. Resulf ot STC non-regression test: LLR: 2.95 (-2.94,2.94) {-1.25,0.25} Total: 26328 W: 3118 L: 3012 D: 20198 Elo +1.40 Ptnml(0-2): 126, 2208, 8397, 2300, 133 https://tests.stockfishchess.org/tests/view/5f553ccc2d02727c56b36db1 closes https://github.com/official-stockfish/Stockfish/pull/3109 bench: 4109324 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 for modern computers Windows x64 + SSSE3 Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64 | Author: SFisGOD
Date: Fri Sep 4 18:58:34 2020 +0200 Timestamp: 1599238714 Use classical eval more often If there is a moderate imbalance, use classical eval with small probability (1/16), as derived from the node counter. STC: LLR: 2.94 (-2.94,2.94) {-0.25,1.25} Total: 32320 W: 3562 L: 3377 D: 25381 Elo +1.99 Ptnml(0-2): 144, 2609, 10478, 2776, 153 https://tests.stockfishchess.org/tests/view/5f520615ba100690c5cc5f80 LTC: LLR: 2.95 (-2.94,2.94) {0.25,1.25} Total: 21032 W: 1116 L: 974 D: 18942 Elo +2.35 Ptnml(0-2): 20, 837, 8664, 971, 24 https://tests.stockfishchess.org/tests/view/5f522eaaba100690c5cc5f8c closes https://github.com/official-stockfish/Stockfish/pull/3107 Bench: 4109324 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 for modern computers Windows x64 + SSSE3 Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64 | Author: Vizvezdenec
Date: Fri Sep 4 18:52:46 2020 +0200 Timestamp: 1599238366 Adjust penalty on refuted early quiet moves This patch changes how previous early moves are penalized in case search finds a best move. Here, the first quiet move that was not a transposition table move is penalized. passed STC https://tests.stockfishchess.org/tests/view/5f51d839ba100690c5cc5f69 LLR: 2.94 (-2.94,2.94) {-0.25,1.25} Total: 10088 W: 1150 L: 997 D: 7941 Elo +5.27 Ptnml(0-2): 41, 772, 3278, 899, 54 passed LTC https://tests.stockfishchess.org/tests/view/5f51e435ba100690c5cc5f76 LLR: 2.93 (-2.94,2.94) {0.25,1.25} Total: 30808 W: 1564 L: 1405 D: 27839 Elo +1.79 Ptnml(0-2): 19, 1245, 12717, 1404, 19 closes https://github.com/official-stockfish/Stockfish/pull/3106 bench 3983758 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 for modern computers Windows x64 + SSSE3 Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64 | Author: Sergio Vieri
Date: Fri Sep 4 08:03:43 2020 +0200 Timestamp: 1599199423 Update default net to nn-308d71810dff.nnue equivalent to 20200903-1739 Net trained from scratch, so it has quite different features extracted compared to the previous net (82215d0fd0df). STC: LLR: 2.98 (-2.94,2.94) {-0.25,1.25} Total: 108328 W: 14048 L: 13719 D: 80561 Elo +1.06 Ptnml(0-2): 842, 10039, 32062, 10390, 831 https://tests.stockfishchess.org/tests/view/5f50e053ba100690c5cc5f00 LTC: LLR: 2.96 (-2.94,2.94) {0.25,1.25} Total: 13872 W: 1059 L: 890 D: 11923 Elo +4.23 Ptnml(0-2): 30, 724, 5270, 871, 41 https://tests.stockfishchess.org/tests/view/5f51821fba100690c5cc5f36 closes https://github.com/official-stockfish/Stockfish/pull/3104 Bench: 3832716 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 for modern computers Windows x64 + SSSE3 Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64 | Author: VoyagerOne
Date: Fri Sep 4 08:00:45 2020 +0200 Timestamp: 1599199245 LMR Simplification remove reduction at non-check cut nodes for second move at low depths STC: LLR: 2.95 (-2.94,2.94) {-1.25,0.25} Total: 61712 W: 6594 L: 6543 D: 48575 Elo +0.29 Ptnml(0-2): 293, 5085, 20082, 5070, 326 https://tests.stockfishchess.org/tests/view/5f5007d6ba100690c5cc5ea9 LTC: LLR: 2.94 (-2.94,2.94) {-0.75,0.25} Total: 57544 W: 2983 L: 2925 D: 51636 Elo +0.35 Ptnml(0-2): 47, 2568, 23495, 2604, 58 https://tests.stockfishchess.org/tests/view/5f50c597ba100690c5cc5ef7 closes https://github.com/official-stockfish/Stockfish/pull/3103 Bench: 3952302 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 for modern computers Windows x64 + SSSE3 Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64 | Author: Unai Corzo
Date: Fri Sep 4 07:58:13 2020 +0200 Timestamp: 1599199093 Simplify singularQuietLMR remove formerPV dependence STC https://tests.stockfishchess.org/tests/view/5f4cb922ba100690c5cc5d35 LLR: 2.96 (-2.94,2.94) {-1.25,0.25} Total: 113672 W: 12347 L: 12368 D: 88957 Elo -0.06 Ptnml(0-2): 566, 9537, 36699, 9420, 614 LTC https://tests.stockfishchess.org/tests/view/5f4e8474ba100690c5cc5e12 LLR: 2.93 (-2.94,2.94) {-0.75,0.25} Total: 43032 W: 2298 L: 2227 D: 38507 Elo +0.57 Ptnml(0-2): 45, 1940, 17475, 2011, 45 closes https://github.com/official-stockfish/Stockfish/pull/3102 bench: 3290084 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 for modern computers Windows x64 + SSSE3 Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64 | Author: Unai Corzo
Date: Fri Sep 4 07:55:41 2020 +0200 Timestamp: 1599198941 Less pruning in qsearch do not prune moves that give discovery checks, even if with negative SSE. STC https://tests.stockfishchess.org/tests/view/5f4cb5e8ba100690c5cc5d25 LLR: 2.96 (-2.94,2.94) {-0.25,1.25} Total: 91328 W: 9940 L: 9667 D: 71721 Elo +1.04 Ptnml(0-2): 491, 7345, 29693, 7670, 465 LTC https://tests.stockfishchess.org/tests/view/5f4dbc2eba100690c5cc5dac LLR: 2.97 (-2.94,2.94) {0.25,1.25} Total: 52448 W: 2799 L: 2586 D: 47063 Elo +1.41 Ptnml(0-2): 53, 2220, 21459, 2445, 47 closes https://github.com/official-stockfish/Stockfish/pull/3098 bench: 4031192 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 for modern computers Windows x64 + SSSE3 Windows x64 Windows 32 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: Fri Sep 4 07:46:06 2020 +0200 Timestamp: 1599198366 Restore development version have fun! 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 Windows 32 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: Wed Sep 2 16:19:30 2020 +0200 Timestamp: 1599056370 Stockfish 12 Official release version of Stockfish 12 Bench: 3624569 ----------------------- It is our pleasure to release Stockfish 12 to users world-wide Downloads will be freely available at https://stockfishchess.org/download/ This version 12 of Stockfish plays significantly stronger than any of its predecessors. In a match against Stockfish 11, Stockfish 12 will typically win at least ten times more game pairs than it loses. This jump in strength, visible in regular progression tests during development[1], results from the introduction of an efficiently updatable neural network (NNUE) for the evaluation in Stockfish[2], and associated tuning of the engine as a whole. The concept of the NNUE evaluation was first introduced in shogi, and ported to Stockfish afterward. Stockfish remains a CPU-only engine, since the NNUE networks can be very efficiently evaluated on CPUs. The recommended parameters of the NNUE network are embedded in distributed binaries, and Stockfish will use NNUE by default. Both the NNUE and the classical evaluations are available, and can be used to assign values to positions that are later used in alpha-beta (PVS) search to find the best move. The classical evaluation computes this value as a function of various chess concepts, handcrafted by experts, tested and tuned using fishtest. The NNUE evaluation computes this value with a neural network based on basic inputs. The network is optimized and trained on the evaluations of millions of positions. The Stockfish project builds on a thriving community of enthusiasts that contribute their expertise, time, and resources to build a free and open source chess engine that is robust, widely available, and very strong. We invite chess fans to join the fishtest testing framework and programmers to contribute on github[3]. Stay safe and enjoy chess! The Stockfish team [1] https://github.com/glinscott/fishtest/wiki/Regression-Tests [2] https://github.com/official-stockfish/Stockfish/commit/84f3e867903f62480c33243dd0ecbffd342796fc [3] https://stockfishchess.org/get-involved/ see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 for modern computers Windows x64 + SSSE3 Windows x64 Windows 32 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: Wed Sep 2 16:18:58 2020 +0200 Timestamp: 1599056338 Update CPU contributors list with fishtest data of Sept. 2 2020 closes https://github.com/official-stockfish/Stockfish/pull/3095 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 Windows 32 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: Wed Sep 2 07:32:10 2020 +0200 Timestamp: 1599024730 Only use MADV_RANDOM if defined needed to compile on Haiku. fixes https://github.com/official-stockfish/Stockfish/issues/3093 closes https://github.com/official-stockfish/Stockfish/pull/3094 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 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64 | Author: VoyagerOne
Date: Tue Sep 1 09:31:40 2020 +0200 Timestamp: 1598945500 LMR Root Node Simplification Simplify LMR at Root node STC: LLR: 2.94 (-2.94,2.94) {-1.25,0.25} Total: 71520 W: 7649 L: 7614 D: 56257 Elo +0.17 Ptnml(0-2): 346, 5845, 23349, 5868, 352 https://tests.stockfishchess.org/tests/view/5f4be8c0ba100690c5cc5cbb LTC: LLR: 2.95 (-2.94,2.94) {-0.75,0.25} Total: 74832 W: 3997 L: 3948 D: 66887 Elo +0.23 Ptnml(0-2): 77, 3422, 30362, 3485, 70 https://tests.stockfishchess.org/tests/view/5f4c603eba100690c5cc5d0e closes https://github.com/official-stockfish/Stockfish/pull/3091 Bench: 3624569 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 for modern computers Windows x64 + SSSE3 Windows x64 Windows 32 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: Tue Sep 1 09:26:56 2020 +0200 Timestamp: 1598945216 Always print an info line before a bestmove if very few nodes are being searched before a bestmove is reported, an info line might be missing. fixes https://github.com/official-stockfish/Stockfish/issues/2757 closes https://github.com/official-stockfish/Stockfish/pull/3088 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 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64 | Author: mstembera
Date: Tue Sep 1 09:26:08 2020 +0200 Timestamp: 1598945168 Use llvm linker with clang on windows for LTO. other linkers might fail to link during the LTO phase. The linker might have to be installed using `pacman -Syu mingw-w64-x86_64-lld` closes https://github.com/official-stockfish/Stockfish/pull/3084 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 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64 | Author: mstembera
Date: Tue Sep 1 09:25:44 2020 +0200 Timestamp: 1598945144 Use stable sort to make sure bench with TB yields same results everywhere. std::sort() is not stable so different implementations can produce different results: use the stable version instead. Observed for '8/6k1/5r2/8/8/8/1K6/Q7 w - - 0 1' yielding different bench results for gcc and MSVC and 3-4-5 syzygy TB prior to this patch. closes https://github.com/official-stockfish/Stockfish/pull/3083 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 Windows 32 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 30 14:22:07 2020 +0200 Timestamp: 1598790127 Update parametes in classical evaluation. Passed STC (NNUE=False): https://tests.stockfishchess.org/tests/view/5f42edfe5089a564a10d84a0 LLR: 2.96 (-2.94,2.94) {-0.25,1.25} Total: 13840 W: 2591 L: 2336 D: 8913 Elo +6.40 Ptnml(0-2): 194, 1453, 3387, 1676, 210 Passed LTC (NNUE=False): https://tests.stockfishchess.org/tests/view/5f4369795089a564a10d84d8 LLR: 2.95 (-2.94,2.94) {0.25,1.25} Total: 159744 W: 19430 L: 18850 D: 121464 Elo +1.26 Ptnml(0-2): 960, 14185, 49030, 14709, 988 closes https://github.com/official-stockfish/Stockfish/pull/3080 bench: 3736029 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 for modern computers Windows x64 + SSSE3 Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64 | Author: VoyagerOne
Date: Sun Aug 30 14:17:23 2020 +0200 Timestamp: 1598789843 QS Pruning Simplification Remove depth dependence in QS pruning STC: LLR: 2.95 (-2.94,2.94) {-1.25,0.25} Total: 40536 W: 4442 L: 4358 D: 31736 Elo +0.72 Ptnml(0-2): 209, 3330, 13118, 3390, 221 https://tests.stockfishchess.org/tests/view/5f49035b3def6407861152f9 LTC: LLR: 2.95 (-2.94,2.94) {-0.75,0.25} Total: 97104 W: 5164 L: 5130 D: 86810 Elo +0.12 Ptnml(0-2): 103, 4478, 39377, 4470, 124 https://tests.stockfishchess.org/tests/view/5f4939d53def640786115322 closes https://github.com/official-stockfish/Stockfish/pull/3077 Bench: 3865238 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 for modern computers Windows x64 + SSSE3 Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64 | Author: MJZ1977
Date: Sun Aug 30 14:13:16 2020 +0200 Timestamp: 1598789596 Add / remove leaves from search tree ttPv add if previous leaf is in search tree and we didn't find a counter move else remove the position if the leaf is the last one in search tree. STC : https://tests.stockfishchess.org/tests/view/5f49203c3def640786115314 LLR: 2.95 (-2.94,2.94) {-0.25,1.25} Total: 29968 W: 3381 L: 3195 D: 23392 Elo +2.16 Ptnml(0-2): 146, 2432, 9671, 2560, 175 LTC : https://tests.stockfishchess.org/tests/view/5f494bea3def640786115336 LLR: 2.96 (-2.94,2.94) {0.25,1.25} Total: 84952 W: 4619 L: 4333 D: 76000 Elo +1.17 Ptnml(0-2): 86, 3765, 34481, 4065, 79 closes https://github.com/official-stockfish/Stockfish/pull/3075 Bench 3527337 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 for modern computers Windows x64 + SSSE3 Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64 | Author: Unai Corzo
Date: Sun Aug 30 14:04:29 2020 +0200 Timestamp: 1598789069 Reintroduce depth reduction Reintroduce depth reduction if the position is not in TT. STC https://tests.stockfishchess.org/tests/view/5f4652e85089a564a10d868c LLR: 2.97 (-2.94,2.94) {-0.25,1.25} Total: 40240 W: 4535 L: 4331 D: 31374 Elo +1.76 Ptnml(0-2): 215, 3276, 12969, 3410, 250 LTC https://tests.stockfishchess.org/tests/view/5f46ca5e5089a564a10d86f3 LLR: 2.93 (-2.94,2.94) {0.25,1.25} Total: 63096 W: 3426 L: 3188 D: 56482 Elo +1.31 Ptnml(0-2): 51, 2798, 25645, 2970, 84 closes https://github.com/official-stockfish/Stockfish/pull/3072 bench: 3611906 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 for modern computers Windows x64 + SSSE3 Windows x64 Windows 32 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 30 14:03:02 2020 +0200 Timestamp: 1598788982 Cleaner make help do not print details if ARCH is an empty string. Follow up for b0b4ca17db49ed03057b5fa4ee4a12dab0e9c9e6 https://github.com/official-stockfish/Stockfish/pull/3071 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 Windows 32 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: Sat Aug 29 21:56:00 2020 +0200 Timestamp: 1598730960 Embed default net, and simplify using non-default nets covers the most important cases from the user perspective: It embeds the default net in the binary, so a download of that binary will result in a working engine with the default net. The engine will be functional in the default mode without any additional user action. It allows non-default nets to be used, which will be looked for in up to three directories (working directory, location of the binary, and optionally a specific default directory). This mechanism is also kept for those developers that use MSVC, the one compiler that doesn't have an easy mechanism for embedding data. It is possible to disable embedding, and instead specify a specific directory, e.g. linux distros might want to use CXXFLAGS="-DNNUE_EMBEDDING_OFF -DDEFAULT_NNUE_DIRECTORY=/usr/share/games/stockfish/" make -j ARCH=x86-64 profile-build passed STC non-regression: https://tests.stockfishchess.org/tests/view/5f4a581c150f0aef5f8ae03a LLR: 2.95 (-2.94,2.94) {-1.25,-0.25} Total: 66928 W: 7202 L: 7147 D: 52579 Elo +0.29 Ptnml(0-2): 291, 5309, 22211, 5360, 293 closes https://github.com/official-stockfish/Stockfish/pull/3070 fixes https://github.com/official-stockfish/Stockfish/issues/3030 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 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64 | Author: VoyagerOne
Date: Wed Aug 26 07:19:35 2020 +0200 Timestamp: 1598419175 Simplify MCP in QS Simplify moveCount pruning in QS by removing depth dependency. STC LLR: 2.94 (-2.94,2.94) {-1.25,0.25} Total: 42960 W: 4741 L: 4661 D: 33558 Elo +0.65 Ptnml(0-2): 218, 3574, 13804, 3678, 206 https://tests.stockfishchess.org/tests/view/5f42e3f75089a564a10d8493 LTC LLR: 2.94 (-2.94,2.94) {-0.75,0.25} Total: 66672 W: 3563 L: 3508 D: 59601 Elo +0.29 Ptnml(0-2): 71, 3064, 26996, 3149, 56 https://tests.stockfishchess.org/tests/view/5f4353285089a564a10d84d0 closes https://github.com/official-stockfish/Stockfish/pull/3067 Bench: 4074430 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 for modern computers Windows x64 + SSSE3 Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64 | Author: VoyagerOne
Date: Wed Aug 26 07:16:50 2020 +0200 Timestamp: 1598419010 Remove Reduce Depth Remove Reduce Depth at PV nodes. STC: LLR: 2.94 (-2.94,2.94) {-1.25,0.25} Total: 56760 W: 6299 L: 6236 D: 44225 Elo +0.39 Ptnml(0-2): 286, 4843, 18076, 4872, 303 https://tests.stockfishchess.org/tests/view/5f41356087a5c3c63d8f53c9 LTC: LLR: 2.95 (-2.94,2.94) {-0.75,0.25} Total: 17496 W: 954 L: 865 D: 15677 Elo +1.77 Ptnml(0-2): 13, 768, 7098, 855, 14 https://tests.stockfishchess.org/tests/view/5f41bb7687a5c3c63d8f53f9 closes https://github.com/official-stockfish/Stockfish/pull/3055 Bench: 3555051 see source |
| Windows x64 for Haswell CPUs Windows x64 for modern computers + AVX2 Windows x64 for modern computers Windows x64 + SSSE3 Windows x64 Windows 32 Linux x64 for Haswell CPUs Linux x64 for modern computers + AVX2 Linux x64 for modern computers Linux x64 + SSSE3 Linux x64 | Author: syzygy1
Date: Wed Aug 26 07:11:26 2020 +0200 Timestamp: 1598418686 Remove EvalList This patch removes the EvalList structure from the Position object and generally simplifies the interface between do_move() and the NNUE code. The NNUE evaluation function first calculates the "accumulator". The accumulator consists of two halves: one for white's perspective, one for black's perspective. If the "friendly king" has moved or the accumulator for the parent position is not available, the accumulator for this half has to be calculated from scratch. To do this, the NNUE node needs to know the positions and types of all non-king pieces and the position of the friendly king. This information can easily be obtained from the Position object. If the "friendly king" has not moved, its half of the accumulator can be calculated by incrementally updating the accumulator for the previous position. For this, the NNUE code needs to know which pieces have been added to which squares and which pieces have been removed from which squares. In principle this information can be derived from the Position object and StateInfo struct (in the same way as undo_move() does this). However, it is probably a bit faster to prepare this information in do_move(), so I have kept the DirtyPiece struct. Since the DirtyPiece struct now stores the squares rather than "PieceSquare" indices, there are now at most three "dirty pieces" (previously two). A promotion move that captures a piece removes the capturing pawn and the captured piece from the board (to SQ_NONE) and moves the promoted piece to the promotion square (from SQ_NONE). An STC test has confirmed a small speedup: https://tests.stockfishchess.org/tests/view/5f43f06b5089a564a10d850a LLR: 2.94 (-2.94,2.94) {-0.25,1.25} Total: 87704 W: 9763 L: 9500 D: 68441 Elo +1.04 Ptnml(0-2): 426, 6950, 28845, 7197, 434 closes https://github.com/official-stockfish/Stockfish/pull/3068 No functional change see source |