6701 Commits

This Branch

This Branch

All Branches

Author	SHA1	Message	Date
Daniel Monroe	a7a56c41f6	Simplify history term in futility pruning ... 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 https://github.com/official-stockfish/Stockfish/pull/6130 Bench: 2411502	2025-07-02 18:31:04 +02:00
pb00067	34b75f1575	Restore integrity of MovePicker::can_move_king_or_pawn ... 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 https://github.com/official-stockfish/Stockfish/pull/6119 Bench: 1945300	2025-07-02 18:31:02 +02:00
disservin	15555e8f4a	Disable linux gcc riscv64 (#6145) ... Temporarily disable it, until we figure out the toolchain issues which are causing the crashes. closes https://github.com/official-stockfish/Stockfish/pull/6145 No functional change	2025-06-29 12:33:20 +02:00
Shawn Xu	5337edfdb6	remove non-functional else ... since we break out of the loop in the other branch closes https://github.com/official-stockfish/Stockfish/pull/6116 no functional change stockfish-dev-20250602-5337edfd	2025-06-02 22:12:37 +02:00
Daniel Monroe	9ac756695e	reduce depth by 5 in probcut ... 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 https://github.com/official-stockfish/Stockfish/pull/6120 Bench: 2307268	2025-06-02 22:09:11 +02:00
Daniel Monroe	254b6d5e85	Simplify corrections in extension margins ... 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 https://github.com/official-stockfish/Stockfish/pull/6117 Bench: 2294814	2025-06-02 22:05:11 +02:00
Shawn Xu	259bdaaa9f	Remove an unnecessary bound check ... 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 https://github.com/official-stockfish/Stockfish/pull/6115 no functional change	2025-06-02 21:57:19 +02:00
Shawn Xu	c9af7674bc	Introduce Secondary TT Aging ... 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 (https://github.com/official-stockfish/Stockfish/issues/5023#issuecomment-2814209391), 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 https://github.com/official-stockfish/Stockfish/pull/6113 Bench: 2144705	2025-06-02 21:55:55 +02:00
Daniel Monroe	3747a19937	Simplify away depth condition in IIR ... Passed simplification STC LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 359520 W: 92714 L: 92849 D: 173957 Ptnml(0-2): 977, 42640, 92614, 42599, 930 https://tests.stockfishchess.org/tests/view/6833705d6ec7634154f9c302 Passed simplification LTC LLR: 2.96 (-2.94,2.94) <-1.75,0.25> Total: 201756 W: 51544 L: 51507 D: 98705 Ptnml(0-2): 89, 21965, 56728, 22012, 84 https://tests.stockfishchess.org/tests/view/68338e386ec7634154f9c790 Passed simplification VLTC LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 48558 W: 12675 L: 12492 D: 23391 Ptnml(0-2): 9, 4779, 14516, 4970, 5 https://tests.stockfishchess.org/tests/view/6838e0b26ec7634154f9d25b closes https://github.com/official-stockfish/Stockfish/pull/6112 Bench: 2302583	2025-06-02 21:52:38 +02:00
Daniel Monroe	70ff5e3163	Simplify away cutoff term in prior countermove bonus ... Passed simplification STC LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 61120 W: 16010 L: 15819 D: 29291 Ptnml(0-2): 150, 7105, 15869, 7276, 160 https://tests.stockfishchess.org/tests/view/683560226ec7634154f9ce0f Passed simplification LTC LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 225090 W: 57555 L: 57543 D: 109992 Ptnml(0-2): 104, 24367, 63603, 24355, 116 https://tests.stockfishchess.org/tests/view/6836420c6ec7634154f9cf5c closes https://github.com/official-stockfish/Stockfish/pull/6111 Bench: 2472910	2025-06-02 21:49:43 +02:00
Daniel Monroe	ddefd6eb6b	Simplify away check term in statscore ... Passed simplification STC LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 61696 W: 16031 L: 15841 D: 29824 Ptnml(0-2): 151, 7160, 16046, 7330, 161 https://tests.stockfishchess.org/tests/view/68353fcc6ec7634154f9cdd5 Passed simplification LTC LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 237990 W: 60994 L: 60995 D: 116001 Ptnml(0-2): 95, 25964, 66903, 25913, 120 https://tests.stockfishchess.org/tests/view/683642256ec7634154f9cf5e closes https://github.com/official-stockfish/Stockfish/pull/6110 Bench: 2521003	2025-06-02 21:47:26 +02:00
Nonlinear2	8da3c2155a	Simplify NMP eval in qsearch ... Passed non-regression STC: https://tests.stockfishchess.org/tests/view/6834e9436ec7634154f9cd6e LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 24864 W: 6626 L: 6394 D: 11844 Ptnml(0-2): 62, 2806, 6477, 3012, 75 Passed non-regression LTC: https://tests.stockfishchess.org/tests/view/683598fd6ec7634154f9ce82 LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 200148 W: 51461 L: 51424 D: 97263 Ptnml(0-2): 92, 21672, 56503, 21721, 86 closes https://github.com/official-stockfish/Stockfish/pull/6109 Bench: 2316591	2025-06-02 21:44:29 +02:00
Carlos Esparza	5695486db9	Fix outdated comment ... closes https://github.com/official-stockfish/Stockfish/pull/6108 No functional change	2025-06-02 21:40:13 +02:00
Robert Nurnberg @ elitebook	9debc540e5	Fix clang-format version in CONTRIBUTING.md ... closes https://github.com/official-stockfish/Stockfish/pull/6107 No functional change	2025-06-02 21:38:53 +02:00
Shawn Xu	d0212906bd	Simplify stat eval history adjustment further ... closes https://github.com/official-stockfish/Stockfish/pull/6106 bench 2074807	2025-06-02 21:37:37 +02:00
mstembera	29b0c07ac8	Simplify Position::pieces() ... closes https://github.com/official-stockfish/Stockfish/pull/6104 No functional change	2025-06-02 21:28:18 +02:00
mstembera	d27298d7dc	Remove unused threatenedPieces ... threatenedPieces is no longer used since #6023 Also can_move_king_or_pawn() can be const. Also remove a couple of redundant declarations. closes https://github.com/official-stockfish/Stockfish/pull/6101 No functional change	2025-06-02 21:24:38 +02:00
Shawn Xu	dc85c5a4c9	Remove nnz lookup table load optimization ... Passed Non-regression STC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 63296 W: 16491 L: 16311 D: 30494 Ptnml(0-2): 129, 6624, 17972, 6784, 139 https://tests.stockfishchess.org/tests/view/6833ce486ec7634154f9cb22 Passed 2nd Non-regression STC: LLR: 2.97 (-2.94,2.94) <-1.75,0.25> Total: 369568 W: 95314 L: 95451 D: 178803 Ptnml(0-2): 897, 40231, 102601, 40222, 833 https://tests.stockfishchess.org/tests/view/68355c956ec7634154f9ce07 closes https://github.com/official-stockfish/Stockfish/pull/6100 no functional change	2025-06-02 21:21:54 +02:00
Daniel Monroe	9fd40b9ea8	Simplify tt depth in stat eval history adjustment ... Passed simplification STC LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 102208 W: 26498 L: 26349 D: 49361 Ptnml(0-2): 284, 12095, 26166, 12306, 253 https://tests.stockfishchess.org/tests/view/683354c76ec7634154f9be88 Passed simplification LTC LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 133422 W: 34050 L: 33945 D: 65427 Ptnml(0-2): 56, 14473, 37559, 14556, 67 https://tests.stockfishchess.org/tests/view/683363626ec7634154f9c298 closes https://github.com/official-stockfish/Stockfish/pull/6099 Bench: 2652411	2025-06-02 21:19:17 +02:00
Daniel Monroe	dfa176fc7e	Small tt verify simplification ... Also fix probcut comment Passed non-regression STC LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 69728 W: 18080 L: 17909 D: 33739 Ptnml(0-2): 161, 7157, 20044, 7354, 148 https://tests.stockfishchess.org/tests/view/68324b116ec7634154f9b478 closes https://github.com/official-stockfish/Stockfish/pull/6094 No functional change	2025-06-02 21:15:56 +02:00
FauziAkram	9b79b75c9b	Enforce minimum compiler versions ... gcc 9.3 clang 10 using unsupported compiler versions will generate an error, older version might miscompile SF CI: improves output on failed bench output closes https://github.com/official-stockfish/Stockfish/pull/6032 No functional change	2025-06-02 21:09:19 +02:00
FauziAkram	73c55e8949	Simplify Double Margin Formula ... Passed STC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 267296 W: 69214 L: 69248 D: 128834 Ptnml(0-2): 760, 31511, 69141, 31475, 761 https://tests.stockfishchess.org/tests/view/682f5d9a6ec7634154f9b01e Passed LTC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 67872 W: 17460 L: 17289 D: 33123 Ptnml(0-2): 25, 7238, 19243, 7401, 29 https://tests.stockfishchess.org/tests/view/6833074b6ec7634154f9b5ae Passed VLTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 118000 W: 30337 L: 30222 D: 57441 Ptnml(0-2): 15, 11783, 35289, 11898, 15 https://tests.stockfishchess.org/tests/view/683336c56ec7634154f9ba46 closes https://github.com/official-stockfish/Stockfish/pull/6097 Bench: 2312696	2025-05-25 21:31:12 +02:00
ppigazzini	e3adfaf8fc	build & ci: update to NDK r27c API level 29 ... Update to the latest LTS version NDK r27c (27.2.12479018), the previous NDK are unsupported by Google, see: https://developer.android.com/ndk/downloads A build with NDK r27c and API level < 29 returns this error: "executable's TLS segment is underaligned: alignment is 8 (skew 0), needs to be at least 64 for ARM64 Bionic" Update the API level to 29 to use the native ELF LTS and avoid the error: https://android.googlesource.com/platform/bionic/+/HEAD/docs/elf-tls.md https://android.googlesource.com/platform/bionic/+/HEAD/android-changes-for-ndk-developers.md#elf-tls-available-for-api-level-29 A dynamic link build of Stockfish uses these libraries: ldd stockfish-android-armv8-dynamic-api35 libm.so => /system/lib64/libm.so libdl.so => /system/lib64/libdl.so libc.so => /system/lib64/libc.so ld-android.so => /system/lib64/ld-android.so ld-android.so : the dynamic linker used by Android (on Linux is named ld-linux.so), responsible for loading and linking shared libraries into an executable at runtime. libdl.so : interface/library layer that provides function for dynamic loading, relies on the underlying functionality provided by the dynamic linker libm.so : math library for Android libc.so : standard C library for Android References: Doc for native (C/C++) API https://developer.android.com/ndk/guides/stable_apis C libraries (libc, libm, libdl): https://developer.android.com/ndk/guides/stable_apis#c_library Bionic changes with API levels: https://android.googlesource.com/platform/bionic/+/HEAD/docs/status.md NDK r27c build system: https://android.googlesource.com/platform/ndk/+/ndk-r27-release/docs/BuildSystemMaintainers.md CI: Update to NDK r27c (27.2.12479018), the default version in GitHub runner, to switch to a recent clang 18. A PGO build requires static linking, because the NDK doesn't ship the Android loaders (linker/linker64), see: https://groups.google.com/g/android-ndk/c/3Ep6zD3xxSY The API level should not be an issue when distributing a static build, use the API 29, the oldest one not affected by the LTS alignement issue. closes https://github.com/official-stockfish/Stockfish/pull/6081 No functional change	2025-05-25 21:28:53 +02:00
Кирилл Зарипов	bebffc5622	Adjust futility pruning thresholds using history ... Passed STC: https://tests.stockfishchess.org/tests/view/6833095a6ec7634154f9b5b3 LLR: 2.93 (-2.94,2.94) <0.00,2.00> Total: 56896 W: 14946 L: 14604 D: 27346 Ptnml(0-2): 117, 6674, 14561, 6942, 154 Passed LTC: https://tests.stockfishchess.org/tests/view/6833179d6ec7634154f9b5da LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 200742 W: 51660 L: 51012 D: 98070 Ptnml(0-2): 96, 21520, 56473, 22204, 78 Passed Non-regression SMP STC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 29080 W: 7591 L: 7373 D: 14116 Ptnml(0-2): 38, 3178, 7881, 3414, 29 https://tests.stockfishchess.org/tests/view/6833689d6ec7634154f9c2ba closes https://github.com/official-stockfish/Stockfish/pull/6092 Bench: 2305697	2025-05-25 21:24:09 +02:00
Shawn Xu	00b1540e01	Always Decrease Reduction on TTMove ... Passed VVLTC w/ LTC Bounds: LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 57792 W: 15005 L: 14676 D: 28111 Ptnml(0-2): 2, 5241, 18082, 5568, 3 https://tests.stockfishchess.org/tests/view/682a0e3c6ec7634154f9a07e Passed VVLTC w/ STC Bounds: LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 372298 W: 96342 L: 95655 D: 180301 Ptnml(0-2): 37, 34598, 116181, 35307, 26 https://tests.stockfishchess.org/tests/view/682a45b16ec7634154f9a3b3 STC Elo Estimate: Elo: 0.15 ± 1.4 (95%) LOS: 58.3% Total: 59612 W: 15414 L: 15388 D: 28810 Ptnml(0-2): 166, 6959, 15527, 6991, 163 nElo: 0.30 ± 2.8 (95%) PairsRatio: 1.00 https://tests.stockfishchess.org/tests/view/68335d276ec7634154f9c25c closes https://github.com/official-stockfish/Stockfish/pull/6095 bench 2634355	2025-05-25 21:19:59 +02:00
Daniel Samek	805a2c1672	Simplify FutilityMoveCount ... Inlined condition, instead of a function. closes https://github.com/official-stockfish/Stockfish/pull/6096 no functional change	2025-05-25 21:12:27 +02:00
Кирилл Зарипов	eb27d9420f	Make ProbCut search shallower in cutNode ... Passed STC: https://tests.stockfishchess.org/tests/view/6832d2436ec7634154f9b4fc LLR: 2.93 (-2.94,2.94) <0.00,2.00> Total: 455072 W: 118162 L: 117237 D: 219673 Ptnml(0-2): 1233, 53409, 117362, 54264, 1268 Passed LTC: https://tests.stockfishchess.org/tests/view/6833323e6ec7634154f9ba17 LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 128436 W: 32916 L: 32415 D: 63105 Ptnml(0-2): 50, 13737, 36137, 14250, 44 closes https://github.com/official-stockfish/Stockfish/pull/6093 Bench: 2232447	2025-05-25 21:05:53 +02:00
FauziAkram	fe7b9b14d2	Implement smoother reduction in time management ... Implement smoother time reduction in time management by replacing a conditional assignment with a continuous sigmoid-based function. The updated logic employs a sigmoid-like function for a more gradual adjustment. Passed STC: LLR: 2.93 (-2.94,2.94) <0.00,2.00> Total: 64448 W: 16838 L: 16492 D: 31118 Ptnml(0-2): 145, 7214, 17207, 7466, 192 https://tests.stockfishchess.org/tests/view/6829dc046ec7634154f99fba Passed LTC: LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 407340 W: 104458 L: 103408 D: 199474 Ptnml(0-2): 196, 42281, 117664, 43335, 194 https://tests.stockfishchess.org/tests/view/6829fe1b6ec7634154f9a036 closes https://github.com/official-stockfish/Stockfish/pull/6091 No functional change	2025-05-25 21:03:16 +02:00
Shawn Xu	e6ec4705a8	Remove deprecated arch from codeql ... closes https://github.com/official-stockfish/Stockfish/pull/6090 no functional change	2025-05-25 21:00:38 +02:00
Nonlinear2	b1b5893a8e	Minor code improvements ... - Remove / add empty lines - fix the `ttcapture` comment - remove the `bonus` variable for `ttMoveHistory` - remove unnecessary parentheses / brackets - refactor the movepick good quiet stage - rename `endMoves` to `endCur`, as the previous name suggests that it points to the end of all generated moves, which it does not. closes https://github.com/official-stockfish/Stockfish/pull/6089 No functional change. Co-Authored-By: xu-shawn <50402888+xu-shawn@users.noreply.github.com>	2025-05-25 20:59:27 +02:00
pb00067	f58d923fe0	Simplify & improve stalemate detection ... Change is functional because now we verify for stalemate also on captures and when not giving check. Green STC test on stalemate-book https://tests.stockfishchess.org/tests/view/682d878f6ec7634154f9ad2f Elo: 2.29 ± 1.3 (95%) LOS: 100.0% Total: 10000 W: 4637 L: 4571 D: 792 Ptnml(0-2): 2, 132, 4664, 202, 0 nElo: 12.42 ± 6.8 (95%) PairsRatio: 1.51 Green LTC test on stalemate-book https://tests.stockfishchess.org/tests/view/682daa2d6ec7634154f9ad67 Elo: 0.80 ± 0.8 (95%) LOS: 96.9% Total: 10000 W: 4727 L: 4704 D: 569 Ptnml(0-2): 0, 64, 4849, 87, 0 nElo: 6.51 ± 6.8 (95%) PairsRatio: 1.36 Passed non-regression test @ LTC https://tests.stockfishchess.org/tests/view/682dd10d6ec7634154f9adb3 LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 148512 W: 38135 L: 38046 D: 72331 Ptnml(0-2): 55, 15759, 42558, 15810, 74 N.B.: The unique concern I have, is that due changes in future a negative SEE capture see might be returned in GOOD_CAPTURE stage. In this case the assert in can_move_king_or_pawn() will trigger since we must guarantee that all moves (also quiets) are generated in movepicker when calling can_move_king_or_pawn(). closes https://github.com/official-stockfish/Stockfish/pull/6088 bench: 2178135	2025-05-25 20:55:49 +02:00
Shawn Xu	472cc764be	Move SIMD code to a separate header ... Passed Non-regression STC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 115328 W: 29903 L: 29777 D: 55648 Ptnml(0-2): 265, 12293, 32444, 12375, 287 https://tests.stockfishchess.org/tests/view/68300e086ec7634154f9b1d1 closes https://github.com/official-stockfish/Stockfish/pull/6086 no functional change	2025-05-25 20:52:57 +02:00
Disservin	2662d6bf35	Update clang-format to v20 ... closes https://github.com/official-stockfish/Stockfish/pull/6085 No functional change	2025-05-23 08:54:06 +02:00
Disservin	c13c1d2c30	Silence "may be used uninitialized" GCC 15 warning ... closes https://github.com/official-stockfish/Stockfish/pull/6083 No functional change	2025-05-23 08:53:00 +02:00
Daniel Monroe	4f021cab3b	Simplify allNode term in prior countermove ... Passed simplification STC LLR: 2.96 (-2.94,2.94) <-1.75,0.25> Total: 53632 W: 14008 L: 13805 D: 25819 Ptnml(0-2): 136, 6253, 13869, 6388, 170 https://tests.stockfishchess.org/tests/view/6828f2b26ec7634154f99b5e Passed simplification LTC LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 82482 W: 21202 L: 21045 D: 40235 Ptnml(0-2): 37, 8986, 23052, 9115, 51 https://tests.stockfishchess.org/tests/view/6829010a6ec7634154f99db3 closes https://github.com/official-stockfish/Stockfish/pull/6068 Bench: 2302782	2025-05-23 08:51:54 +02:00
ppigazzini	e03898b57c	ci: add tests and artifacts for windows-11-arm ... integrate armv8 and armv8-dotprod builds on windows-11-arm in ci, creating the corresponding artifacts. Correct Makefile to drop warnings when providing a CXX, add MINGW ARM64 to get_native_properties.sh fixes https://github.com/official-stockfish/Stockfish/issues/5640 closes https://github.com/official-stockfish/Stockfish/pull/6078 No functional change	2025-05-21 07:29:57 +02:00
Nonlinear2	54fb42ddf8	clean up code ... **Non functional changes:** in search.cpp: - an unnecessary pair of parenthesis in the IIR condition has been removed. - refactored the stalemate trap detection code in movepick.cpp: - use the variables `from`, `to`, `piece`, `pieceType` and `capturedPiece` instead of calling the same functions multiple times in `MovePicker::score()`. - rename `MovePicker::other_piece_types_mobile()`. **Functional changes:** - make sure the processed move is always legal in `MovePicker::other_piece_types_mobile()`. passed non regression STC: https://tests.stockfishchess.org/tests/view/6829da686ec7634154f99faf LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 95680 W: 24962 L: 24820 D: 45898 Ptnml(0-2): 221, 9622, 28025, 9738, 234 Passed non regression LTC: https://tests.stockfishchess.org/tests/view/682a102c6ec7634154f9a086 LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 117666 W: 30065 L: 29957 D: 57644 Ptnml(0-2): 45, 10173, 38291, 10277, 47 Run of 10k games on the stalemate opening book: https://tests.stockfishchess.org/tests/view/682b114e6ec7634154f9aa2d Elo: 0.76 ± 0.9 (95%) LOS: 95.3% Total: 10000 W: 4637 L: 4615 D: 748 Ptnml(0-2): 0, 75, 4828, 97, 0 nElo: 5.83 ± 6.8 (95%) PairsRatio: 1.29 closes https://github.com/official-stockfish/Stockfish/pull/6080 Bench: 2422771	2025-05-21 07:25:40 +02:00
Shawn Xu	347e328fdb	Simplify TT Replacement Strategy ... Passed Non-regression STC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 50528 W: 13160 L: 12958 D: 24410 Ptnml(0-2): 132, 5681, 13439, 5877, 135 https://tests.stockfishchess.org/tests/view/682a8b296ec7634154f9a785 Passed Non-regression STC w/ High Hash Pressure: LLR: 2.98 (-2.94,2.94) <-1.75,0.25> Total: 30048 W: 7849 L: 7621 D: 14578 Ptnml(0-2): 75, 3390, 7884, 3582, 93 https://tests.stockfishchess.org/tests/view/682a9caf6ec7634154f9a7ae Passed Non-regression LTC w/ High Hash Pressure: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 17610 W: 4584 L: 4362 D: 8664 Ptnml(0-2): 7, 1799, 4974, 2015, 10 https://tests.stockfishchess.org/tests/view/682ab3966ec7634154f9a8c8 closes https://github.com/official-stockfish/Stockfish/pull/6079 Bench: 2422771	2025-05-19 20:49:28 +02:00
Michael Chaly	56ea1fadf1	Tweak low ply history ... Increase low ply history maximum ply by 1 and also allow to use it for check evasions scoring. Pased STC: https://tests.stockfishchess.org/tests/view/682a2db36ec7634154f9a358 LLR: 2.95 (-2.94,2.94) <0.00,2.00> Total: 66464 W: 17440 L: 17081 D: 31943 Ptnml(0-2): 191, 7717, 17056, 8078, 190 Passed LTC: https://tests.stockfishchess.org/tests/view/682a3d406ec7634154f9a39c LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 384030 W: 98476 L: 97452 D: 188102 Ptnml(0-2): 180, 41564, 107522, 42550, 199 closes https://github.com/official-stockfish/Stockfish/pull/6075 Bench: 2422771	2025-05-19 20:47:34 +02:00
Daniel Samek	ccfa651968	Remove full depth search reduction when cutNode ... Passed STC-simplification bounds: https://tests.stockfishchess.org/tests/view/6829dd6d6ec7634154f99fd3 LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 67872 W: 17629 L: 17443 D: 32800 Ptnml(0-2): 167, 7988, 17451, 8152, 178 Passed LTC-simplification bounds: https://tests.stockfishchess.org/tests/view/6829f2176ec7634154f9a01c LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 94818 W: 24328 L: 24184 D: 46306 Ptnml(0-2): 52, 10246, 26667, 10394, 50 closes https://github.com/official-stockfish/Stockfish/pull/6074 bench: 2245168	2025-05-19 20:44:14 +02:00
Shawn Xu	0f102f3692	Simplify Quiet Early Move Penalty ... Passed STC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 185344 W: 47995 L: 47939 D: 89410 Ptnml(0-2): 527, 21898, 47754, 21978, 515 https://tests.stockfishchess.org/tests/view/682a47536ec7634154f9a3bc Passed LTC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 101706 W: 26050 L: 25912 D: 49744 Ptnml(0-2): 53, 11056, 28499, 11190, 55 https://tests.stockfishchess.org/tests/view/682a61736ec7634154f9a50e closes https://github.com/official-stockfish/Stockfish/pull/6072 Bench: 2012032	2025-05-19 07:45:28 +02:00
mstembera	009632c465	Simplify handling of good/bad quiets ... Simplify the handling of good/bad quiets and make it more similar to the way we handle good/bad captures. The good quiet limit was adjusted from -7998 to -14000 to keep the ratio of good/bad quiets about the same as master. This also fixes a "bug" that previously returned some bad quiets during the GOOD_QUIET stage when some qood quiets weren't sorted at low depths. STC https://tests.stockfishchess.org/tests/view/6827a68c6ec7634154f9992b LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 75936 W: 19722 L: 19547 D: 36667 Ptnml(0-2): 186, 8937, 19589, 9028, 228 LTC https://tests.stockfishchess.org/tests/view/6828f8096ec7634154f99b82 LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 104112 W: 26773 L: 26638 D: 50701 Ptnml(0-2): 51, 11363, 29098, 11488, 56 closes https://github.com/official-stockfish/Stockfish/pull/6071 Bench: 2007023	2025-05-19 07:42:56 +02:00
Shawn Xu	39942db3ff	Simplify In-Check Statscore ... Passed Non-regression STC: LLR: 2.98 (-2.94,2.94) <-1.75,0.25> Total: 129760 W: 33701 L: 33580 D: 62479 Ptnml(0-2): 359, 15248, 33575, 15309, 389 https://tests.stockfishchess.org/tests/view/681a88193629b02d74b17123 Passed Non-regression LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 519612 W: 132224 L: 132512 D: 254876 Ptnml(0-2): 246, 56823, 145960, 56527, 250 https://tests.stockfishchess.org/tests/view/681f9ed43629b02d74b177c3 closes https://github.com/official-stockfish/Stockfish/pull/6070 bench: 2046462	2025-05-19 07:39:56 +02:00
Daniel Monroe	6e9b5af0f0	Check evaluation after ttMove before doing a tt cut ... Passed STC LLR: 2.97 (-2.94,2.94) <0.00,2.00> Total: 239136 W: 62222 L: 61608 D: 115306 Ptnml(0-2): 675, 28046, 61525, 28634, 688 https://tests.stockfishchess.org/tests/view/681053293629b02d74b1668f Passed LTC LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 448770 W: 115237 L: 114088 D: 219445 Ptnml(0-2): 177, 48128, 126619, 49291, 170 https://tests.stockfishchess.org/tests/view/681902de3629b02d74b16f6d closes https://github.com/official-stockfish/Stockfish/pull/6069 Bench: 2035432	2025-05-19 07:37:15 +02:00
FauziAkram	4f76768fcf	Remove a moveCount condition ... Passed STC: LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 70816 W: 18315 L: 18134 D: 34367 Ptnml(0-2): 210, 8213, 18360, 8436, 189 https://tests.stockfishchess.org/tests/view/68248197a527315e07cccb2d Passed LTC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 121770 W: 31248 L: 31130 D: 59392 Ptnml(0-2): 61, 13338, 33995, 13404, 87 https://tests.stockfishchess.org/tests/view/68272ff46ec7634154f998ad closes https://github.com/official-stockfish/Stockfish/pull/6067 bench: 2319161	2025-05-19 07:31:26 +02:00
Mapika	1b6975ac41	Add quiet move streak tracking to search stack ... Passed STC: LLR: 2.93 (-2.94,2.94) <0.00,2.00> Total: 109344 W: 28473 L: 28053 D: 52818 Ptnml(0-2): 320, 12756, 28085, 13206, 305 https://tests.stockfishchess.org/tests/view/6828c43e6ec7634154f99a10 Passed LTC: LLR: 2.96 (-2.94,2.94) <0.50,2.50> Total: 76308 W: 19721 L: 19323 D: 37264 Ptnml(0-2): 39, 8145, 21386, 8547, 37 https://tests.stockfishchess.org/tests/view/6828f65a6ec7634154f99b72 closes https://github.com/official-stockfish/Stockfish/pull/6066 Bench: 2161814	2025-05-19 07:27:26 +02:00
Shawn Xu	6f445631ab	Simplify Futility Margin ... Passed STC Non-regression: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 159008 W: 41500 L: 41414 D: 76094 Ptnml(0-2): 501, 18821, 40759, 18937, 486 https://tests.stockfishchess.org/tests/view/680ff9e23629b02d74b1663a Passed LTC Non-regression: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 163572 W: 41617 L: 41543 D: 80412 Ptnml(0-2): 90, 17755, 46024, 17825, 92 https://tests.stockfishchess.org/tests/view/6814dd973629b02d74b16bac closes https://github.com/official-stockfish/Stockfish/pull/6065 Bench: 2018775	2025-05-19 07:22:20 +02:00
Shawn Xu	e4b0f37493	Shrink Enum Sizes ... Passed STC: LLR: 2.95 (-2.94,2.94) <0.00,2.00> Total: 110848 W: 28974 L: 28564 D: 53310 Ptnml(0-2): 302, 12118, 30132, 12612, 260 https://tests.stockfishchess.org/tests/view/68242770a527315e07ccca38 closes https://github.com/official-stockfish/Stockfish/pull/6063 no functional change	2025-05-19 07:17:39 +02:00
Shawn Xu	6b7e05f0c5	Simplify PCM TTMove Bonus ... Passed Non-regression STC: LLR: 2.97 (-2.94,2.94) <-1.75,0.25> Total: 114048 W: 29597 L: 29459 D: 54992 Ptnml(0-2): 315, 13619, 29045, 13703, 342 https://tests.stockfishchess.org/tests/view/681e83533629b02d74b17701 Passed Non-regression LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 61014 W: 15582 L: 15405 D: 30027 Ptnml(0-2): 25, 6485, 17307, 6668, 22 https://tests.stockfishchess.org/tests/view/68226b523629b02d74b17b89 closes https://github.com/official-stockfish/Stockfish/pull/6061 bench 2016566	2025-05-19 07:13:39 +02:00
FauziAkram	07f6edf934	Refactor Position::pseudo_legal Pawn Move Check ... use intermediate variables to make the statement easier to read closes https://github.com/official-stockfish/Stockfish/pull/6045 No functional change	2025-05-19 07:12:11 +02:00