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When a high-depth TT entry fail to produce a cutoff, decrease the stored depth by 1. This is intended to help cases such as #5023 (#5023 (comment)), where entries with extremely high depths prevent TT cutoffs, contributing to search explosions. Passed STC: LLR: 2.95 (-2.94,2.94) <0.00,2.00> Total: 128800 W: 33502 L: 33053 D: 62245 Ptnml(0-2): 331, 15084, 33149, 15477, 359 https://tests.stockfishchess.org/tests/view/683958e56ec7634154f9d2a9 Passed LTC: LLR: 2.97 (-2.94,2.94) <0.50,2.50> Total: 63288 W: 16376 L: 16005 D: 30907 Ptnml(0-2): 26, 6712, 17798, 7081, 27 https://tests.stockfishchess.org/tests/view/683aa4026ec7634154f9d469 closes #6113 Bench: 2144705
When failing high, it is always true that `alpha < beta` and `beta <= bestValue`. Therefore if alpha and bestValue is not in decisive range, it is guaranteed that beta is not. closes #6115 no functional change
Passed simplification STC LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 96192 W: 25002 L: 24852 D: 46338 Ptnml(0-2): 242, 10868, 25716, 11038, 232 https://tests.stockfishchess.org/tests/view/683b44cb6ec7634154f9d6ac Passed simplification LTC LLR: 2.96 (-2.94,2.94) <-1.75,0.25> Total: 83334 W: 21473 L: 21317 D: 40544 Ptnml(0-2): 37, 8877, 23674, 9051, 28 https://tests.stockfishchess.org/tests/view/683b79786ec7634154f9d75a closes #6117 Bench: 2294814
Passed simplification STC LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 63328 W: 16402 L: 16213 D: 30713 Ptnml(0-2): 174, 7378, 16340, 7629, 143 https://tests.stockfishchess.org/tests/view/6833530e6ec7634154f9be7f Passed simplification LTC LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 69936 W: 17795 L: 17625 D: 34516 Ptnml(0-2): 29, 7631, 19474, 7809, 25 https://tests.stockfishchess.org/tests/view/68335e386ec7634154f9c266 closes #6120 Bench: 2307268
since we break out of the loop in the other branch closes #6116 no functional change
Temporarily disable it, until we figure out the toolchain issues which are causing the crashes. closes #6145 No functional change
PR6005 broken by PR6071 passed STC non regression https://tests.stockfishchess.org/tests/view/6839791f6ec7634154f9d312 LLR: 2.96 (-2.94,2.94) <-1.75,0.25> Total: 31776 W: 8353 L: 8130 D: 15293 Ptnml(0-2): 74, 3566, 8382, 3795, 71 passed LTC non-regression https://tests.stockfishchess.org/tests/view/6839c87a6ec7634154f9d367 LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 120756 W: 31015 L: 30899 D: 58842 Ptnml(0-2): 50, 12732, 34703, 12838, 55 closes #6119 Bench: 1945300
Passed simplification STC LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 298816 W: 76814 L: 76881 D: 145121 Ptnml(0-2): 726, 35477, 77057, 35434, 714 https://tests.stockfishchess.org/tests/view/683f440f6ec7634154f9dc7f Passed simplification LTC LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 237774 W: 60801 L: 60802 D: 116171 Ptnml(0-2): 91, 26088, 66532, 26083, 93 https://tests.stockfishchess.org/tests/view/68441189ffbc71bd236778de closes #6130 Bench: 2411502
lowPlyHistory is always cleared at the start of `iterative_deepening`, so clearing it here is non-functional. closes #6144 No functional change
Passed non-regression STC LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 148960 W: 38409 L: 38312 D: 72239 Ptnml(0-2): 372, 17664, 38318, 17747, 379 https://tests.stockfishchess.org/tests/view/684c5773703522d4f129c5f7 Passed non-regression LTC LLR: 2.96 (-2.94,2.94) <-1.75,0.25> Total: 180720 W: 46188 L: 46130 D: 88402 Ptnml(0-2): 84, 19608, 50929, 19644, 95 https://tests.stockfishchess.org/tests/view/68505fa5703522d4f129cbab closes #6143 Bench: 2055894
Having the size of these lists in two separate places likely contributed to the crashes seen during the recent tuning attempt https://tests.stockfishchess.org/tests/view/685c413343ce022d15794536. Thanks to @MinetaS for spotting this. closes #6142 No functional change
1. Remove "default" rule as "default" has no special meaning as a rule name. Make runs the very first rule whose name doesn't begin with a dot (which is "help" currently). 2. Make "format" rule not update dependencies. closes #6140 No functional change
About a 1% speedup for ARCH x86-64-avx512 and x86-64-vnni512. Note: This could be optimized further if we wanted to add an ARCH supporting VBMI2 which is even more modern than VNNI. https://en.wikichip.org/wiki/x86/avx512_vbmi2 closes #6139 No functional change
Passed STC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 43456 W: 11178 L: 10966 D: 21312 Ptnml(0-2): 114, 5078, 11114, 5326, 96 https://tests.stockfishchess.org/tests/view/6849ae13e84567164b5c9de9 Passed LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 63090 W: 16302 L: 16125 D: 30663 Ptnml(0-2): 37, 6837, 17603, 7048, 20 https://tests.stockfishchess.org/tests/view/684ab516e84567164b5ca02f closes #6134 Bench: 2249459
Passed Sudden Death STC: https://tests.stockfishchess.org/tests/view/68455fe5375c2b77d9855351 LLR: 2.91 (-2.94,2.94) <-1.75,0.25> Total: 49248 W: 13008 L: 12798 D: 23442 Ptnml(0-2): 309, 5491, 12821, 5687, 316 Passed Sudden Death LTC: https://tests.stockfishchess.org/tests/view/6845a392375c2b77d98553cf LLR: 3.01 (-2.94,2.94) <-1.75,0.25> Total: 551070 W: 141699 L: 142031 D: 267340 Ptnml(0-2): 1923, 60608, 150916, 60054, 2034 Passed Standard STC: https://tests.stockfishchess.org/tests/view/683c5ebb6ec7634154f9d989 LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 142624 W: 36808 L: 36709 D: 69107 Ptnml(0-2): 302, 15448, 39745, 15483, 334 Passed Standard LTC: https://tests.stockfishchess.org/tests/view/683f1a4f6ec7634154f9dc5a LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 146922 W: 37381 L: 37296 D: 72245 Ptnml(0-2): 69, 13552, 46117, 13671, 52 closes #6132 Bench: 2249459
Passed simplification STC LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 204000 W: 52541 L: 52506 D: 98953 Ptnml(0-2): 561, 24133, 52589, 24144, 573 https://tests.stockfishchess.org/tests/view/684f24ce703522d4f129cab5 Passed simplification LTC LLR: 2.96 (-2.94,2.94) <-1.75,0.25> Total: 156150 W: 39890 L: 39807 D: 76453 Ptnml(0-2): 82, 16882, 44043, 17007, 61 https://tests.stockfishchess.org/tests/view/6855d8bf1d0d9fc6587538f8 closes #6148 bench 2766493
Passed STC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 25920 W: 6822 L: 6593 D: 12505 Ptnml(0-2): 54, 2932, 6783, 3113, 78 https://tests.stockfishchess.org/tests/view/6853f9c2038630d25f468672 Passed LTC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 177318 W: 45339 L: 45278 D: 86701 Ptnml(0-2): 85, 19333, 49765, 19388, 88 https://tests.stockfishchess.org/tests/view/6854468a038630d25f4686c0 closes #6149 bench: 2437275
Passed simplification STC LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 317280 W: 81589 L: 81678 D: 154013 Ptnml(0-2): 799, 37651, 81847, 37526, 817 https://tests.stockfishchess.org/tests/view/684e197a703522d4f129c9f0 Passed simplification LTC LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 174816 W: 44656 L: 44593 D: 85567 Ptnml(0-2): 83, 19064, 49058, 19113, 90 https://tests.stockfishchess.org/tests/view/6858aa54a596a06817bb924f closes #6150 bench: 2508140
Passed simplification STC LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 163168 W: 42136 L: 42055 D: 78977 Ptnml(0-2): 410, 19224, 42212, 19351, 387 https://tests.stockfishchess.org/tests/view/684e16ee703522d4f129c9e9 Passed simplification LTC LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 303144 W: 77580 L: 77647 D: 147917 Ptnml(0-2): 150, 33110, 85134, 33013, 165 https://tests.stockfishchess.org/tests/view/6852ff97703522d4f129d5f7 closes #6152 bench: 2294774
Passed STC LLR: 2.96 (-2.94,2.94) <0.00,2.00> Total: 166720 W: 43191 L: 42701 D: 80828 Ptnml(0-2): 348, 18567, 45069, 18999, 377 https://tests.stockfishchess.org/tests/view/686ae98dfe0f2fe354c0c867 Refactor movegen to emit to a vector with 16-bit elements, which enables a speedup with AVX512-VBMI2 when writing moves to the move list. Very crude timing measurements of perft via timing ./stockfish "go perft 7" demonstrates approximately 17% perft speedup: Summary ./Stockfish-dev/src/stockfish 'go perft 7' ran 1.17 ± 0.04 times faster than ./Stockfish-base/src/stockfish 'go perft 7' Estimated overall nps increase of 0.4% via speedtest: 33605229 -> 33749825 (many thanks JonathanHallstrom). The corresponding arch is avx512icl as it is a good baseline for consumer avx-512 feature set support; Intel Ice Lake was the first consumer AVX-512 CPU and it is a decent subset of what AMD Zen 4 supports. closes #6153 No functional change
Currently, search.cpp uses three different syntax when accessing class member variables * thisThread object references. This was a remnant from when pos.this_thread() was necessary for thread-local variable access * this object references * implicit member variable access This PR aims to deprecate thisThread and standardize this syntax to implicit variable access, which is consistent with the rest of SF's codebase. closes #6154 no functional change
Passed STC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 118080 W: 30427 L: 30298 D: 57355 Ptnml(0-2): 290, 13880, 30561, 14029, 280 https://tests.stockfishchess.org/tests/view/6853f9bc038630d25f468670 Passed LTC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 232272 W: 59187 L: 59182 D: 113903 Ptnml(0-2): 111, 25430, 65014, 25505, 76 https://tests.stockfishchess.org/tests/view/68585c40a596a06817bb922e closes #6157 bench: 2227361
All parameters were tuned on 60k STC games (https://tests.stockfishchess.org/tests/view/6867ef49fe0f2fe354c0c735). Passed STC: LLR: 2.98 (-2.94,2.94) <0.00,2.00> Total: 60576 W: 15794 L: 15444 D: 29338 Ptnml(0-2): 141, 7003, 15642, 7369, 133 https://tests.stockfishchess.org/tests/view/686d5af11451bd6fb830772a Passed LTC: LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 58722 W: 15159 L: 14799 D: 28764 Ptnml(0-2): 19, 6259, 16455, 6599, 29 https://tests.stockfishchess.org/tests/view/686f9fd51451bd6fb83081c9 closes #6158 bench: 2706299
closes #6159 No functional change
Writing a TUNE expression like int smallNetThreshold = 962; TUNE(smallNetThreshold, 850, 1050); is wrong and can lead to a weird binary. It should thus fail to even compile, with the proper intellisense you'll also see the error directly in your editor. A cheap way to prevent this is to disallow any fundamental type in the parameter list. closes #6164 No functional change
This change only sets the margin to 0 when depth <= 2 and margin <= 42 which never has a difference, thus non-functional Passed non-regression STC LLR: 3.51 (-2.94,2.94) <-1.75,0.25> Total: 306976 W: 78935 L: 78961 D: 149080 Ptnml(0-2): 630, 34097, 84067, 34057, 637 https://tests.stockfishchess.org/tests/view/68708015fa93cf16d3bb2782 closes #6170 No functional change
It seems that now only checking if static eval is above beta by some margin is all that's necessary. Passed Non-Regression STC LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 227264 W: 58430 L: 58421 D: 110413 Ptnml(0-2): 532, 26559, 59454, 26542, 545 https://tests.stockfishchess.org/tests/view/68763a77432ca24f6388c766 Passed Non-Regression LTC LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 72048 W: 18622 L: 18455 D: 34971 Ptnml(0-2): 26, 7775, 20272, 7908, 43 https://tests.stockfishchess.org/tests/view/687c9f2b6e17e7fa3939b0c5 closes #6175 Bench: 2759840
alues were tuned with 125k VVLTC games. Passed VVLTC 1st sprt: https://tests.stockfishchess.org/tests/view/68865feb7b562f5f7b731341 LLR: 2.95 (-2.94,2.94) <0.00,2.00> Total: 39640 W: 10380 L: 10109 D: 19151 Ptnml(0-2): 5, 3556, 12424, 3833, 2 Passed VVLTC 2nd sprt: https://tests.stockfishchess.org/tests/view/68864dfa7b562f5f7b7312ee LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 25972 W: 6807 L: 6537 D: 12628 Ptnml(0-2): 0, 2294, 8132, 2556, 4 closes #6188 Bench: 3143696
Passed STC non-regression bounds https://tests.stockfishchess.org/tests/view/6870db4bfa93cf16d3bb286a LLR: 3.00 (-2.94,2.94) <-1.75,0.25> Total: 182016 W: 46735 L: 46673 D: 88608 Ptnml(0-2): 368, 19895, 50465, 19867, 413 closes #6161 no functional change
Passed STC simplification bounds https://tests.stockfishchess.org/tests/view/686fcb091451bd6fb83082bc LLR: 2.92 (-2.94,2.94) <-1.75,0.25> Total: 762816 W: 196717 L: 197295 D: 368804 Ptnml(0-2): 2052, 90457, 196853, 90109, 1937 Passed LTC simplification bounds https://tests.stockfishchess.org/tests/view/68808d316e17e7fa3939b35d LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 44736 W: 11499 L: 11303 D: 21934 Ptnml(0-2): 24, 4766, 12586, 4974, 18 closes #6176 bench: 2684407
closes #6523 No functional change
The bestValue can sometimes go down. This happens 2% of the time or so. This fix stops it from decreasing. Failed gainer STC: LLR: -2.94 (-2.94,2.94) <0.00,2.00> Total: 146176 W: 37930 L: 37976 D: 70270 Ptnml(0-2): 480, 17422, 37366, 17304, 516 https://tests.stockfishchess.org/tests/view/6953be19572093c1986da66a Passed Non-regression LTC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 257796 W: 65662 L: 65683 D: 126451 Ptnml(0-2): 164, 28247, 72087, 28246, 154 https://tests.stockfishchess.org/tests/view/69554ff0d844c1ce7cc7e333 closes #6520 fixes #6519 Bench: 2477446
Recent changes to the Square enum (reducing it from int32_t to int8_t) now allow the compiler to vectorize loops that were previously too wide for targets below AVX-512. However, this vectorization which Clang performs is not correct and causes a miscompilation. Disable this vectorization. This particular issue was noticable with Clang 15 and Clang 19, on avx2 as well as applie-silicon. Ref: #6063 Original Clang Issue: llvm/llvm-project#80494 First reported by #6528, though misinterpreted. closes #6529 No functional change
Only the one on line 158 is actually required but doesn't hurt to add constexpr where applicable here. Warning was "comparison of unsigned expression in '< 0' is always false" closes #6530 No functional change
Compiles and Runs Stockfish on all supported gcc & clang compilers. Only linux and avx2 currently. closes #6533 No functional change
Although shared history has been successful overall, it led to some speed issues with large numbers of threads. Originally we just split by NUMA node, but on systems with non-unified L3 caches (most AMD workstation and server CPUs, and some Intel E-core based server CPUs), this can still lead to a speed penalty at the default config. Thus, we decided to further subdivide the shared history based on the L3 cache structure. Based on this test, the original SPRTs, and speed experiments, we decided that grouping L3 domains to reach 32 threads per SharedHistories was a reasonable balance for affected systems – but we may revisit this in the future. See the PR for full details. In an extreme case, a single-socket EPYC 9755 configured with 1 numa domain per socket, the nps increases from: Nodes/second : 182827480 to Nodes/second : 229118365 In many cases, when L3 caches are shared between many threads, or when several numa nodes are already configured per socket, this patch does not influence the default. This default setting can adjusted with the existing NumaPolicy option. closes #6526 No functional change.
Passed STC: LLR: 2.97 (-2.94,2.94) <-1.75,0.25> Total: 165792 W: 42849 L: 42768 D: 80175 Ptnml(0-2): 512, 19499, 42800, 19566, 519 https://tests.stockfishchess.org/tests/view/695cdd95912b7ff140de60c2 Passed LTC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 80448 W: 20619 L: 20459 D: 39370 Ptnml(0-2): 47, 8693, 22596, 8829, 59 https://tests.stockfishchess.org/tests/view/695f7e84ca95f52e4b852536 closes #6535 bench: 2050811
Speed up by using unsigned enums. Passed STC: LLR: 2.98 (-2.94,2.94) <0.00,2.00> Total: 49248 W: 12894 L: 12568 D: 23786 Ptnml(0-2): 119, 5353, 13397, 5593, 16 https://tests.stockfishchess.org/tests/view/695e3e5002d0182a589fe965 closes #6532 No functional change
Refactor index LUT construction to simplify make_index. Passed STC Non-Regression: LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 62432 W: 16193 L: 16006 D: 30233 Ptnml(0-2): 189, 6950, 16764, 7111, 202 https://tests.stockfishchess.org/tests/view/6959985ad844c1ce7cc7eac8 closes #6522 No functional change.
Windows 10 is missing the GroupMasks and GroupCount members, this breaks compiles on Windows 10. Windows 11 builds, including the official ones, run fine on Windows 10/11. To support developers/testers on Windows 10, fallback conditionally to the Windows 10 struct definition. closes #6538 No functional change
scaledBonus can reach rather large values, which lead to an int overflow as detected anematode using ubsan. (see #6505 (comment)) It can be fixed by scaling nominator and denominator appropriately, which doesn't change the bench, as long as there is no overflow. First overflow/bench change happens at depth 26 closes #6540 Bench: 2050811
avoid munmap of memory when exiting via signal, which avoids side effects such as triggering asserts or (caught) segfaults while the process exists. closes #6542 No functional change
With the current setup, on Linux, SIGILL (and SIGSEGV/SIGBUS etc., in the case of a program bug) lead to no feedback if they occur after the signal handlers are installed, they just exit silently. By invoking the default signal handler, we can still get the appropriate feedback. This is particularly important for feedback if someone downloads the wrong SF binary and runs it on Linux. closes #6554 No functional change
some environment dependent execution (e.g. pid) were being std::hash'ed, and net filenames put in unordered maps. Also uses sprintf instead of std::to_string. Depending on precise content, this could lead to different PGO'ed binaries. This is mitigated by using a basic hash function. This also fixes a potential issue in net filename generation, in cases where std::hash would use invocation dependent salt, which is not the cases today for typical std libraries. Closes #6562 No functional change
fixes github.com//issues/6571 closes #6572 No functional change
Official release version of Stockfish 18 Bench: 2050811 --- Stockfish 18 Today, we have the pleasure of announcing Stockfish 18, a new major release. As always, you can freely download it at [stockfishchess.org/download][1] and use it as a drop-in replacement in the [GUI of your choice][2] to benefit from stronger play and more accurate analysis. Whether you can spare hours or days of CPU time, your help matters for the ongoing development of Stockfish. Find out how you can help at [stockfishchess.org/get-involved][3]. Join our [Discord server][4] to get in touch with the community of developers and users of the project! Quality of chess play In tests against Stockfish 17, this new release brings an Elo gain of up to [46 points][5], and wins [four times as many game pairs][6] as it loses. Quality improved throughout, including in [Fischer Random Chess][7]. Stockfish is stronger than any human, even when running on older or low-end hardware. On the highest-end hardware, where Stockfish can search over [500 million positions per second][8], it continues to [dominate chess engine tournaments][9]. Update highlights Next-Generation Evaluation This release introduces the SFNNv10 network architecture. The network’s input layer has been augmented with 'Threat Inputs' features as part of a massive community effort. These features allow the engine to 'see' which pieces are threatened more naturally, resulting in more accurate evaluations. Hardware and Performance Optimizations A key highlight is the new 'Shared Memory' implementation, which allows different Stockfish processes to share the same memory space for neural network weights. This makes it the most efficient version for cloud analysis and high-concurrency testing. Significant efforts have also been made to utilize hardware more effectively by adapting the code to make use of modern CPU instructions and refining how threads interact during a search. Search Improvements Stockfish 18 features a heavily refined search, utilizing 'Correction History' to dynamically adjust evaluations based on patterns found during the search itself. These and other refinements allow the engine to detect stalemates and evaluate fortresses significantly better than previous versions. A particularly rare issue, involving threefold repetition detection, en passant, and pins, was also fixed. Refactored Training Workflow The training of Stockfish's neural networks has transitioned to an automated and reproducible model. This new framework allows the project to employ standardized recipes to chain complex training stages together. This transition facilitates the training of networks using over 100 billion positions of [Lc0 evaluation data][10]. Thank you In this release in particular, we are deeply grateful to the contributors who shared their research and ideas to help develop the new threat-input network architecture. The Stockfish project builds on a thriving community of enthusiasts (thanks to everybody!) who contribute their expertise, time, and resources to build a free and open-source chess engine that is robust, widely available, and very strong. We would like to express our gratitude for the [14.6k stars][11] that light up our GitHub project. Thank you for your support and encouragement – your recognition means a lot to us. Programmers can contribute to the project either directly to [Stockfish][12] (C++), to [Fishtest][13] (HTML, CSS, JavaScript, and Python), to our trainer [nnue-pytorch][14] (C++ and Python), or to our [website][15] (HTML, CSS/SCSS, and JavaScript). The Stockfish team [1]: https://stockfishchess.org/download [2]: https://official-stockfish.github.io/docs/stockfish-wiki/Download-and-usage.html#download-a-chess-gui [3]: https://stockfishchess.org/get-involved/ [4]: https://discord.gg/GWDRS3kU6R [5]: https://tests.stockfishchess.org/tests/view/696a9e15cec152c6220c1d19 [6]: https://tests.stockfishchess.org/tests/view/696a9e4dcec152c6220c1d1b [7]: https://tests.stockfishchess.org/tests/view/696a9e83cec152c6220c1d1d [8]: https://openbenchmarking.org/test/pts/stockfish [9]: https://en.wikipedia.org/wiki/Stockfish_(chess)#Competition_results [10]: https://lczero.org/blog/2021/06/the-importance-of-open-data/ [11]: https://github.com/official-stockfish/Stockfish/stargazers [12]: https://github.com/official-stockfish/Stockfish [13]: https://github.com/official-stockfish/fishtest [14]: https://github.com/official-stockfish/nnue-pytorch [15]: https://github.com/official-stockfish/stockfish-web
closes #6581 No functional change
also add -flax-vector-conversions=none to the build closes #6587 No functional change
Somehow we forgot to add shm.h & shm_linux.h to the list of headers to be formatted. closes #6591 No functional change
closes #6583 No functional change
Add Move::to_sq_unchecked() that bypasses the is_ok() assertion, for use in branchless code paths where invalid moves are masked out. passed STC: LLR: 2.93 (-2.94,2.94) <0.00,2.00> Total: 92384 W: 24052 L: 23665 D: 44667 Ptnml(0-2): 265, 10229, 24831, 10588, 279 https://tests.stockfishchess.org/tests/view/6974dfc798dc5fff1dba5b74 closes #6569 No functional change
Make the sf_assume also have an effect with clang and help the compiler proof it's side effect free by comparing against a variable. https://tests.stockfishchess.org/tests/view/6979d14fa2c75f923be1e681 LLR: 2.93 (-2.94,2.94) <0.00,2.00> Total: 63488 W: 16530 L: 16188 D: 30770 Ptnml(0-2): 167, 6904, 17277, 7212, 184 closes #6573 No functional change
Improve `get_native_properties.sh` with a refreshed implementation. The new version covers all Makefile ARCH variants and keeps the script interface stable while improving portability and CPU feature detection across supported platforms. Drop the asset file name to avoid coupling outputs to a specific artifact naming scheme. Refs: https://github.com/ppigazzini/get-native-properties (includes a testing framework) closes #6552 No functional change.
Looks for the text "Official release version of Stockfish" in the commit message to determine if something is a release. closes #6580 No functional change
Passed STC Non-Regression: https://tests.stockfishchess.org/tests/view/696f1a398b64097dacd231c3 LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 122272 W: 31587 L: 31466 D: 59219 Ptnml(0-2): 301, 13358, 33750, 13373, 354 slight speedup as well: 1 thread bench: sf_base = 2238429 +/- 1221 (95%) sf_test = 2248298 +/- 1371 (95%) diff = 9869 +/- 1571 (95%) speedup = 0.44090% +/- 0.070% (95%) 32 thread speedtest: sf_base = 41016996 +/- 83654 (95%) sf_test = 41185801 +/- 84269 (95%) diff = 168805 +/- 79986 (95%) speedup = 0.41155% +/- 0.195% (95%) closes #6559 No functional change
Passed non-regression STC: LLR: 2.96 (-2.94,2.94) <-1.75,0.25> Total: 119680 W: 31011 L: 30884 D: 57785 Ptnml(0-2): 354, 13231, 32575, 13294, 386 https://tests.stockfishchess.org/tests/view/6973b06c6cd60a8e97ca62e5 closes #6565 No functional change
passed STC: LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 163680 W: 42214 L: 42137 D: 79329 Ptnml(0-2): 454, 18054, 44734, 18157, 441 https://tests.stockfishchess.org/tests/view/697e6f4e5f56030af97b5a3c closes #6588 No functional change
Removes threat features of the form piece -> king, thus saving 13MB of net space and approximately 0.8 threat feature updates per incremental accumulator update. Passed non-regression STC: LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 33664 W: 8864 L: 8636 D: 16164 Ptnml(0-2): 136, 3926, 8501, 4112, 157 https://tests.stockfishchess.org/tests/view/6981dcda4776a4e6e7fef2ac Passed non-regression LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 46896 W: 12077 L: 11881 D: 22938 Ptnml(0-2): 41, 5118, 12924, 5334, 31 https://tests.stockfishchess.org/tests/view/69827c6beb87369ff4d0c7d5 closes #6593 bench: 2668754
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