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Author	SHA1	Message	Date
Shawn XuandJoost VandeVondele	db824e26be	Pass accumulator caches by reference ... closes https://github.com/official-stockfish/Stockfish/pull/6416 No functional change	2025-11-14 17:32:17 +01:00
Shawn XuandJoost VandeVondele	bd82b9e01f	Cleanup, fix style issues ... use naming convention for variables, functions, constants closes https://github.com/official-stockfish/Stockfish/pull/6416 no functional change	2025-11-14 17:29:01 +01:00
Shawn XuandJoost VandeVondele	cd7880c030	Simplify Corrhist Bonus ... Passed Non-regression STC: LLR: 2.96 (-2.94,2.94) <-1.75,0.25> Total: 187776 W: 48687 L: 48631 D: 90458 Ptnml(0-2): 570, 22327, 48090, 22279, 622 https://tests.stockfishchess.org/tests/view/68f58019637acd2a11e72233 Passed Non-regression LTC: LLR: 2.96 (-2.94,2.94) <-1.75,0.25> Total: 159378 W: 41027 L: 40946 D: 77405 Ptnml(0-2): 122, 17645, 44078, 17718, 126 https://tests.stockfishchess.org/tests/view/68fe7492637acd2a11e73090 closes https://github.com/official-stockfish/Stockfish/pull/6385 Bench: 2458738	2025-11-01 11:36:33 +01:00
Shawn XuandJoost VandeVondele	0351652995	Simplify Pawn History Bonus ... Passed Non-regression STC: LLR: 2.98 (-2.94,2.94) <-1.75,0.25> Total: 122016 W: 31655 L: 31525 D: 58836 Ptnml(0-2): 388, 14317, 31474, 14435, 394 https://tests.stockfishchess.org/tests/view/68f57e66637acd2a11e7221d Passed Non-regression LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 81348 W: 21016 L: 20858 D: 39474 Ptnml(0-2): 45, 8793, 22841, 8949, 46 https://tests.stockfishchess.org/tests/view/68f9e2d9637acd2a11e72997 closes https://github.com/official-stockfish/Stockfish/pull/6382 Bench: 2370893	2025-11-01 11:32:53 +01:00
Shawn XuandJoost VandeVondele	f434cc2918	Allow AccumulatorStack::size to point to one past the end ... this is guaranteed to be correct since we access the last element with `size - 1` closes https://github.com/official-stockfish/Stockfish/pull/6368 fixes https://github.com/official-stockfish/Stockfish/issues/6367 no functional change	2025-11-01 10:34:44 +01:00
Shawn XuandJoost VandeVondele	e5c2dc5edd	remove clang-format workaround ... closes https://github.com/official-stockfish/Stockfish/pull/6332 No functional change	2025-10-05 09:33:42 +02:00
Shawn XuandJoost VandeVondele	5895f47dab	Further simplify low ply history in evasions ... Passed Non-regression STC (vs #6308): LLR: 2.96 (-2.94,2.94) <-1.75,0.25> Total: 174208 W: 45414 L: 45343 D: 83451 Ptnml(0-2): 633, 20324, 45095, 20443, 609 https://tests.stockfishchess.org/tests/view/68c24be359efc3c96b611487 Passed Non-regression LTC (vs #6308): LLR: 2.96 (-2.94,2.94) <-1.75,0.25> Total: 110070 W: 28099 L: 27969 D: 54002 Ptnml(0-2): 56, 11919, 30962, 12035, 63 https://tests.stockfishchess.org/tests/view/68c4efa559efc3c96b611dfc closes https://github.com/official-stockfish/Stockfish/pull/6321 Bench: 2151873	2025-10-05 09:18:16 +02:00
Shawn XuandJoost VandeVondele	3073d82ccf	Simplify use of low-ply history in evasions ... Passed Non-regression STC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 65024 W: 16991 L: 16804 D: 31229 Ptnml(0-2): 182, 7423, 17119, 7602, 186 https://tests.stockfishchess.org/tests/view/68c23f5459efc3c96b6113df Passed Non-regression LTC: LLR: 2.96 (-2.94,2.94) <-1.75,0.25> Total: 207312 W: 53126 L: 53095 D: 101091 Ptnml(0-2): 126, 21986, 59389, 22041, 114 https://tests.stockfishchess.org/tests/view/68c241e359efc3c96b6113ef closes https://github.com/official-stockfish/Stockfish/pull/6308 Bench: 2515619	2025-09-28 21:21:57 +02:00
Shawn XuandJoost VandeVondele	c62e71e78f	Simplify a separate term in low ply history bonus formula ... Passed Non-regression STC: LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 211200 W: 54887 L: 54860 D: 101453 Ptnml(0-2): 719, 24894, 54296, 25023, 668 https://tests.stockfishchess.org/tests/view/68c21e7f59efc3c96b6112c8 Passed Non-regression LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 217842 W: 55587 L: 55568 D: 106687 Ptnml(0-2): 130, 23651, 61313, 23724, 103 https://tests.stockfishchess.org/tests/view/68c230ec59efc3c96b61135a closes https://github.com/official-stockfish/Stockfish/pull/6307 Bench: 2070860	2025-09-28 21:19:22 +02:00
Shawn XuandJoost VandeVondele	415a1ad426	Simplify Probcut Clamp Further ... Passed Non-regression STC: LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 157984 W: 41116 L: 41030 D: 75838 Ptnml(0-2): 568, 18570, 40601, 18714, 539 https://tests.stockfishchess.org/tests/view/68b750518f94a4e5a7fe76cd Passed Non-regression LTC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 335232 W: 85443 L: 85543 D: 164246 Ptnml(0-2): 177, 36616, 94137, 36502, 184 https://tests.stockfishchess.org/tests/view/68bc767259efc3c96b61076b closes https://github.com/official-stockfish/Stockfish/pull/6303 Bench: 2213844	2025-09-28 21:12:01 +02:00
3 people	7a36c0e95f	Remove quiet move streak ... Passed Non-regression STC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 67712 W: 17744 L: 17555 D: 32413 Ptnml(0-2): 204, 8030, 17274, 8069, 279 https://tests.stockfishchess.org/tests/view/68b784628f94a4e5a7fe7706 Passed Non-regression LTC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 196050 W: 50270 L: 50228 D: 95552 Ptnml(0-2): 122, 21465, 54813, 21499, 126 https://tests.stockfishchess.org/tests/view/68ba119d8f94a4e5a7fe7941 closes https://github.com/official-stockfish/Stockfish/pull/6299 Bench: 2238789 Co-authored-by: Daniel Monroe <github.com@danielmonroe.net>	2025-09-28 21:08:58 +02:00
Shawn XuandJoost VandeVondele	d5f152b5df	Reintroduce #6259 ... Reintroduces af181d9, which no longer regresses on matetrack after #6286 Using ./stockfish on matetrack.epd with --nodes 1000000 Engine ID: Stockfish dev-20250902-adfddd2c Total FENs: 6554 Found mates: 3490 Best mates: 2429 Passed Non-regression LTC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 37608 W: 9726 L: 9523 D: 18359 Ptnml(0-2): 16, 4001, 10578, 4182, 27 https://tests.stockfishchess.org/tests/view/68b886778f94a4e5a7fe77d9 closes https://github.com/official-stockfish/Stockfish/pull/6289 Bench: 2493363	2025-09-06 07:55:14 +02:00
Shawn XuandJoost VandeVondele	adfddd2c98	Add scaling note to STC/LTC tunes ... It has been repeatedly shown that such tunes are suspectible to become anti-scaling. Below are some recent examples: https://github.com/official-stockfish/Stockfish/commit/2e91a8635468e40c89a2303ce50384864d088611 https://github.com/official-stockfish/Stockfish/commit/d11f49b790429c236a1a4169f0d8052635fc03dc Passed STC: LLR: 2.95 (-2.94,2.94) <0.00,2.00> Total: 32448 W: 8651 L: 8342 D: 15455 Ptnml(0-2): 81, 3695, 8408, 3914, 126 https://tests.stockfishchess.org/tests/view/6899489b0049e8ccef9d64ad Passed LTC: LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 73854 W: 19042 L: 18649 D: 36163 Ptnml(0-2): 37, 7908, 20659, 8271, 52 https://tests.stockfishchess.org/tests/view/689abbe7fd8719b088c8d514 Revert VVLTC with STC bound: LLR: 2.95 (-2.94,2.94) <0.00,2.00> Total: 53802 W: 14030 L: 13740 D: 26032 Ptnml(0-2): 5, 4924, 16754, 5212, 6 https://tests.stockfishchess.org/tests/view/68a9a9f575da51a345a5a675 Revert VVLTC with LTC bound: LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 53658 W: 14022 L: 13699 D: 25937 Ptnml(0-2): 3, 4894, 16712, 5217, 3 https://tests.stockfishchess.org/tests/view/68a8d2b2b6fb3300203bca77 https://tests.stockfishchess.org/tests/view/688cf38bf17748b4d23c8057 https://tests.stockfishchess.org/tests/view/6890bc7792fcad741b804a19 Passed LTC: LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 74928 W: 19466 L: 19071 D: 36391 Ptnml(0-2): 37, 8048, 20901, 8439, 39 Failed Non-regression VLTC: LLR: -2.94 (-2.94,2.94) <-1.75,0.25> Total: 57704 W: 14643 L: 14928 D: 28133 Ptnml(0-2): 5, 5925, 17280, 5634, 8 https://tests.stockfishchess.org/tests/view/6890bc7792fcad741b804a19 (Note that an STC-tuned version passed non-regression, but was shortly simplified) https://github.com/official-stockfish/Stockfish/pull/6040 Passed STC: LLR: 2.93 (-2.94,2.94) <0.00,2.00> Total: 27776 W: 7352 L: 7054 D: 13370 Ptnml(0-2): 68, 3126, 7221, 3386, 87 https://tests.stockfishchess.org/tests/view/680ec0f83629b02d74b1605b Passed LTC: LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 161304 W: 41432 L: 40864 D: 79008 Ptnml(0-2): 61, 17305, 45357, 17863, 66 https://tests.stockfishchess.org/tests/view/680ec7f93629b02d74b16084 Failed Non-regression VVLTC: LLR: -2.94 (-2.94,2.94) <-1.75,0.25> Total: 313466 W: 80573 L: 81089 D: 151804 Ptnml(0-2): 38, 29689, 97782, 29199, 25 https://tests.stockfishchess.org/tests/view/6810d0533629b02d74b16756 https://github.com/official-stockfish/Stockfish/pull/5907 https://github.com/official-stockfish/Stockfish/pull/5887 Passed LTC with STC bounds: https://tests.stockfishchess.org/tests/view/67b115dd6c6b9e172ad1592f LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 75756 W: 19393 L: 19044 D: 37319 Ptnml(0-2): 60, 8251, 20913, 8588, 66 Passed LTC with LTC bounds: https://tests.stockfishchess.org/tests/view/67af5f5d6c6b9e172ad15765 LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 108126 W: 27880 L: 27412 D: 52834 Ptnml(0-2): 85, 11786, 29866, 12228, 98 Revert VVLTC w/ STC bounds: LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 56342 W: 14536 L: 14246 D: 27560 Ptnml(0-2): 7, 5061, 17741, 5359, 3 https://tests.stockfishchess.org/tests/view/67be4f8ad8d5c2c657c52d10 Revert VVLTC w/ LTC bounds: LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 66562 W: 17364 L: 17016 D: 32182 Ptnml(0-2): 3, 6145, 20637, 6493, 3 https://tests.stockfishchess.org/tests/view/67bcd25ff6b602bd7222ea40 closes https://github.com/official-stockfish/Stockfish/pull/6284 no functional change	2025-09-02 20:42:03 +02:00
Shawn XuandJoost VandeVondele	f2da0ccf3f	Simplify SMP Reduction ... Passed Non-regression SMP STC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 232784 W: 59845 L: 59841 D: 113098 Ptnml(0-2): 289, 26459, 62934, 26379, 331 https://tests.stockfishchess.org/tests/view/68ab96bf75da51a345a5acd6 Passed Non-regression SMP LTC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 374270 W: 95978 L: 96113 D: 182179 Ptnml(0-2): 118, 38575, 109888, 38432, 122 https://tests.stockfishchess.org/tests/view/68abcf1c75da51a345a5adb6 closes https://github.com/official-stockfish/Stockfish/pull/6285 Bench: 2667107	2025-09-02 20:41:08 +02:00
Shawn XuandJoost VandeVondele	75ac6c7a06	simplify stalemate further ... Non-regression STC: LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 155200 W: 40650 L: 40562 D: 73988 Ptnml(0-2): 533, 17588, 41258, 17700, 521 https://tests.stockfishchess.org/tests/view/68abe11375da51a345a5adec Non-regression LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 82824 W: 21442 L: 21287 D: 40095 Ptnml(0-2): 51, 8738, 23675, 8901, 47 https://tests.stockfishchess.org/tests/view/68b205606217b8721dca9c8e 10k Stalemate: Elo: 1.46 ± 1.2 (95%) LOS: 99.0% Total: 10000 W: 4640 L: 4598 D: 762 Ptnml(0-2): 0, 140, 4678, 182, 0 https://tests.stockfishchess.org/tests/view/68b2059b6217b8721dca9c90 closes https://github.com/official-stockfish/Stockfish/pull/6283 Bench: 2431727	2025-09-02 20:39:02 +02:00
Shawn XuandJoost VandeVondele	3f18352396	Further Simplify Stalemate Detection ... Passed Non-regression STC: LLR: 2.98 (-2.94,2.94) <-1.75,0.25> Total: 191520 W: 49633 L: 49582 D: 92305 Ptnml(0-2): 557, 20676, 53260, 20693, 574 https://tests.stockfishchess.org/tests/view/68ab570075da51a345a5abe1 Passed Non-regression LTC: LLR: 2.96 (-2.94,2.94) <-1.75,0.25> Total: 212934 W: 54643 L: 54618 D: 103673 Ptnml(0-2): 117, 22417, 61364, 22462, 107 https://tests.stockfishchess.org/tests/view/68ab84e975da51a345a5ac6b 10k Stalemate: Elo: 0.35 ± 1.2 (95%) LOS: 71.6% Total: 10000 W: 4602 L: 4592 D: 806 Ptnml(0-2): 0, 148, 4694, 158, 0 nElo: 1.99 ± 6.8 (95%) PairsRatio: 1.07 https://tests.stockfishchess.org/tests/view/68abeb8175da51a345a5af82 closes https://github.com/official-stockfish/Stockfish/pull/6268 Bench: 2420973	2025-08-30 15:12:06 +02:00
3 people	7d213afd37	Non-functional simplifications ... closes https://github.com/official-stockfish/Stockfish/pull/6267 No functional change Co-authored-by: Daniel Monroe <github.com@danielmonroe.net>	2025-08-30 15:09:47 +02:00
Shawn XuandJoost VandeVondele	a289ee389a	Simplify Capture Futility Pruning ... Passed Non-regression STC: LLR: 2.97 (-2.94,2.94) <-1.75,0.25> Total: 187904 W: 48639 L: 48583 D: 90682 Ptnml(0-2): 560, 22150, 48502, 22154, 586 https://tests.stockfishchess.org/tests/view/68aad56075da51a345a5a9e3 Passed Non-regression LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 94302 W: 24246 L: 24101 D: 45955 Ptnml(0-2): 44, 10274, 26371, 10417, 45 https://tests.stockfishchess.org/tests/view/68ab541975da51a345a5aacf closes https://github.com/official-stockfish/Stockfish/pull/6266 Bench: 2376717	2025-08-30 15:09:00 +02:00
Shawn XuandJoost VandeVondele	678d503d8f	Simplify LMR Extensions ... Passed Non-regression STC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 236896 W: 61683 L: 61683 D: 113530 Ptnml(0-2): 730, 28057, 60901, 28003, 757 https://tests.stockfishchess.org/tests/view/68a9c20475da51a345a5a6a0 Passed Non-regression LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 73644 W: 18936 L: 18770 D: 35938 Ptnml(0-2): 33, 7951, 20685, 8123, 30 https://tests.stockfishchess.org/tests/view/68aa95c575da51a345a5a88a closes https://github.com/official-stockfish/Stockfish/pull/6265 Bench: 2693376	2025-08-24 20:10:43 +02:00
Shawn XuandJoost VandeVondele	e2fdf6f005	Simplify separate malus formulas ... Passed Non-regression STC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 16352 W: 4336 L: 4090 D: 7926 Ptnml(0-2): 54, 1832, 4157, 2080, 53 https://tests.stockfishchess.org/tests/view/68a808f0b6fb3300203bca08 Passed Non-regression LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 94014 W: 24129 L: 23986 D: 45899 Ptnml(0-2): 47, 9917, 26934, 10064, 45 https://tests.stockfishchess.org/tests/view/68a8f45cb6fb3300203bcb5e closes https://github.com/official-stockfish/Stockfish/pull/6256 Bench: 2483704	2025-08-24 19:55:35 +02:00
Shawn XuandJoost VandeVondele	901ad7e7ee	Simplify quiet move streak ... Passed Non-regression STC: LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 46272 W: 12076 L: 11866 D: 22330 Ptnml(0-2): 140, 5407, 11860, 5561, 168 https://tests.stockfishchess.org/tests/view/68a9c26575da51a345a5a6a2 Passed Non-regression LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 140442 W: 35984 L: 35886 D: 68572 Ptnml(0-2): 72, 15333, 39305, 15447, 64 https://tests.stockfishchess.org/tests/view/68aa245e75da51a345a5a80d closes https://github.com/official-stockfish/Stockfish/pull/6258 Bench: 2931171	2025-08-24 19:52:42 +02:00
Shawn XuandJoost VandeVondele	85f87649bf	Simplify stalemate detection ... Passed Non-regression STC: LLR: 2.96 (-2.94,2.94) <-1.75,0.25> Total: 107392 W: 27959 L: 27818 D: 51615 Ptnml(0-2): 317, 12094, 28735, 12231, 319 https://tests.stockfishchess.org/tests/view/68a65d8ab6fb3300203bc825 Passed Non-regression LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 94014 W: 24129 L: 23986 D: 45899 Ptnml(0-2): 47, 9917, 26934, 10064, 45 https://tests.stockfishchess.org/tests/view/68a8f45cb6fb3300203bcb5e Passed Stalemate 10k: Elo: 2.22 ± 1.3 (95%) LOS: 100.0% Total: 10000 W: 4626 L: 4562 D: 812 Ptnml(0-2): 1, 137, 4659, 203, 0 nElo: 12.00 ± 6.8 (95%) PairsRatio: 1.47 https://tests.stockfishchess.org/tests/view/68a65d8ab6fb3300203bc825 Supersedes #6114 Closes #6232 closes https://github.com/official-stockfish/Stockfish/pull/6255 Bench: 2473929	2025-08-24 19:50:51 +02:00
Shawn XuandJoost VandeVondele	14a2e50a3d	Simplify key after ... Passed Non-regression STC: LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 534016 W: 139438 L: 139771 D: 254807 Ptnml(0-2): 2098, 63469, 136136, 63278, 2027 https://tests.stockfishchess.org/tests/view/688ac64d502b34dd5e7110a4 Passed Non-regression LTC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 43980 W: 11346 L: 11149 D: 21485 Ptnml(0-2): 31, 4689, 12353, 4886, 31 https://tests.stockfishchess.org/tests/view/688ea8a47d68fe4f7f130eb3 closes https://github.com/official-stockfish/Stockfish/pull/6207 Bench: 2884232	2025-08-04 15:07:37 +02:00
Shawn XuandJoost VandeVondele	e2aa125570	Consistent syntax for class members ... 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 https://github.com/official-stockfish/Stockfish/pull/6154 no functional change	2025-07-24 10:13:24 +02:00
Shawn XuandDisservin	318c948c4d	Remove non-functional low-ply history fill ... lowPlyHistory is always cleared at the start of `iterative_deepening`, so clearing it here is non-functional. closes https://github.com/official-stockfish/Stockfish/pull/6144 No functional change	2025-07-02 18:31:04 +02:00
Shawn XuandJoost VandeVondele	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	2025-06-02 22:12:37 +02:00
Shawn XuandJoost VandeVondele	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 XuandJoost VandeVondele	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
Shawn XuandJoost VandeVondele	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
Shawn XuandJoost VandeVondele	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
Shawn XuandJoost VandeVondele	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
Shawn XuandJoost VandeVondele	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
Shawn XuandJoost VandeVondele	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
Shawn XuandJoost VandeVondele	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
Shawn XuandJoost VandeVondele	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
Shawn XuandJoost VandeVondele	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
Shawn XuandJoost VandeVondele	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 XuandJoost VandeVondele	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 XuandJoost VandeVondele	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
Shawn XuandDisservin	b5f11085dd	Do more extensions in nodes far from the root ... Parameters found by @FauziAkram in the latest tune. Passed VVLTC w/ LTC Bound: LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 243264 W: 63452 L: 62774 D: 117038 Ptnml(0-2): 18, 22494, 75934, 23164, 22 https://tests.stockfishchess.org/tests/view/680e82b23629b02d74b15e27 Passed VVLTC w/ STC Bound: LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 37838 W: 9935 L: 9667 D: 18236 Ptnml(0-2): 6, 3383, 11873, 3651, 6 https://tests.stockfishchess.org/tests/view/681e707a3629b02d74b176e8 STC Elo Estimate: Elo: -0.49 ± 2.4 (95%) LOS: 34.8% Total: 20000 W: 5118 L: 5146 D: 9736 Ptnml(0-2): 55, 2365, 5182, 2349, 49 nElo: -0.96 ± 4.8 (95%) PairsRatio: 0.99 https://tests.stockfishchess.org/tests/view/6822af4b3629b02d74b17be6 closes https://github.com/official-stockfish/Stockfish/pull/6059 Bench: 2135382	2025-05-13 20:46:27 +02:00
Shawn XuandDisservin	e9925b122f	Simplify ttCapture LMR ... Passed Non-regression STC: LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 51104 W: 13389 L: 13184 D: 24531 Ptnml(0-2): 182, 5940, 13068, 6215, 147 https://tests.stockfishchess.org/tests/view/680ef2503629b02d74b16498 Passed Non-regression LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 73350 W: 18804 L: 18638 D: 35908 Ptnml(0-2): 30, 7906, 20639, 8068, 32 https://tests.stockfishchess.org/tests/view/6810510e3629b02d74b1668a closes https://github.com/official-stockfish/Stockfish/pull/6044 Bench: 1805151	2025-05-13 20:36:42 +02:00
Shawn XuandDisservin	81cc004060	Remove risk tolerance ... Passed STC: LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 379328 W: 97567 L: 97724 D: 184037 Ptnml(0-2): 909, 44861, 98314, 44638, 942 https://tests.stockfishchess.org/tests/view/680defc63629b02d74b15b62 Passed LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 160752 W: 40762 L: 40685 D: 79305 Ptnml(0-2): 60, 17548, 45091, 17609, 68 https://tests.stockfishchess.org/tests/view/680e8ff43629b02d74b15e65 closes https://github.com/official-stockfish/Stockfish/pull/6037 Bench: 1897340	2025-05-13 20:31:37 +02:00
Shawn XuandDisservin	b0a7a34d3f	Simplify malus calculation ... closes https://github.com/official-stockfish/Stockfish/pull/6024 No functional change	2025-04-27 19:43:47 +02:00
Shawn XuandDisservin	4e49f8dff9	Clean up search ... * Correct IIR scaling comments * Replace `(PvNode || cutNode)` with `!allNode` * Consistent formatting for scaler tags * Add comments to some recently-introduced LMR terms * Add comments on PCM bonus tweaks Passed Non-regression STC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 389472 W: 102457 L: 102622 D: 184393 Ptnml(0-2): 1676, 41887, 107798, 41676, 1699 https://tests.stockfishchess.org/tests/view/67a0ea670774dfd78deb23cd closes https://github.com/official-stockfish/Stockfish/pull/5854 Bench: 1585741	2025-04-27 19:26:02 +02:00
Shawn XuandJoost VandeVondele	4176ad7b0a	simplify risk tolerance ... Passed Non-regression STC: LLR: 2.98 (-2.94,2.94) <-1.75,0.25> Total: 73408 W: 19028 L: 18844 D: 35536 Ptnml(0-2): 201, 8709, 18743, 8807, 244 https://tests.stockfishchess.org/tests/view/68051f3698cd372e3ae9f63a Passed Non-regression LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 91236 W: 23193 L: 23045 D: 44998 Ptnml(0-2): 34, 9908, 25599, 10030, 47 https://tests.stockfishchess.org/tests/view/6805239498cd372e3ae9fa41 closes https://github.com/official-stockfish/Stockfish/pull/6000 bench 1864632	2025-04-26 21:49:38 +02:00
Shawn XuandJoost VandeVondele	16cd38dba1	Tweak TT Move Reduction by TT Move History ... Passed STC: LLR: 2.93 (-2.94,2.94) <0.00,2.00> Total: 62496 W: 16197 L: 15844 D: 30455 Ptnml(0-2): 200, 7234, 16011, 7619, 184 https://tests.stockfishchess.org/tests/view/67f7fa9b31d7cf8afdc4609c Passed LTC: LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 400470 W: 102068 L: 101012 D: 197390 Ptnml(0-2): 201, 43207, 112347, 44295, 185 https://tests.stockfishchess.org/tests/view/67f927b0cd501869c66975e0 Passed VVLTC Non-regression: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 125394 W: 32408 L: 32304 D: 60682 Ptnml(0-2): 3, 11702, 39188, 11796, 8 https://tests.stockfishchess.org/tests/view/6804c215cd501869c66986b9 closes https://github.com/official-stockfish/Stockfish/pull/5998 bench 1760988	2025-04-26 21:43:11 +02:00
Shawn XuandJoost VandeVondele	b915ed702a	remove StateInfo::next ... unused. closes https://github.com/official-stockfish/Stockfish/pull/5997 no functional change	2025-04-26 21:37:17 +02:00
Shawn XuandJoost VandeVondele	f273eea71f	Remove non-functional accumulator reset ... Passed Non-regression STC: LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 219360 W: 56600 L: 56583 D: 106177 Ptnml(0-2): 582, 23419, 61620, 23518, 541 https://tests.stockfishchess.org/tests/view/67fad20dcd501869c669780f closes https://github.com/official-stockfish/Stockfish/pull/5986 no functional change	2025-04-26 21:30:01 +02:00
Shawn XuandDisservin	2b4926e091	Simplify TT Move History ... Part 1 passed Non-regression STC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 195552 W: 50394 L: 50349 D: 94809 Ptnml(0-2): 581, 23222, 50122, 23273, 578 https://tests.stockfishchess.org/tests/view/67eb6ea831d7cf8afdc44c30 Part 2 passed Non-regression STC: LLR: 2.92 (-2.94,2.94) <-1.75,0.25> Total: 181664 W: 46786 L: 46727 D: 88151 Ptnml(0-2): 517, 21403, 46974, 21380, 558 https://tests.stockfishchess.org/tests/view/67eb6f3331d7cf8afdc44c33 Passed Non-regression LTC: LLR: 2.96 (-2.94,2.94) <-1.75,0.25> Total: 155454 W: 39496 L: 39412 D: 76546 Ptnml(0-2): 77, 16950, 43580, 17052, 68 https://tests.stockfishchess.org/tests/view/67eee76531d7cf8afdc45358 Passed Non-regression VLTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 118266 W: 30263 L: 30148 D: 57855 Ptnml(0-2): 11, 11844, 35309, 11957, 12 https://tests.stockfishchess.org/tests/view/67f2414a31d7cf8afdc45760 closes https://github.com/official-stockfish/Stockfish/pull/5987 Bench: 1792850	2025-04-18 14:32:26 +02:00
Shawn XuandDisservin	d7c04a9429	Introduce TT Move History Double Extensions ... Passed VVLTC w/ STC bounds: LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 74918 W: 19436 L: 19120 D: 36362 Ptnml(0-2): 6, 6890, 23354, 7200, 9 https://tests.stockfishchess.org/tests/view/67e4a1088888403457d878bb Passed VVLTC w/ LTC bounds: LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 111706 W: 29050 L: 28619 D: 54037 Ptnml(0-2): 13, 10218, 34959, 10651, 12 https://tests.stockfishchess.org/tests/view/67d6877c517865b4a2dfd36b STC Elo Estimate: Elo: 1.26 ± 2.0 (95%) LOS: 88.8% Total: 30000 W: 7855 L: 7746 D: 14399 Ptnml(0-2): 104, 3531, 7630, 3622, 113 nElo: 2.44 ± 3.9 (95%) PairsRatio: 1.03 https://tests.stockfishchess.org/tests/view/67eacb8c31d7cf8afdc44b99 closes https://github.com/official-stockfish/Stockfish/pull/5961 Bench: 1887897	2025-04-02 17:53:05 +02:00
Shawn XuandDisservin	d2cb927a04	Simplify TT cutoff conthist updates ... Passed Non-regression STC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 86304 W: 22251 L: 22084 D: 41969 Ptnml(0-2): 250, 10214, 22123, 10249, 316 https://tests.stockfishchess.org/tests/view/67db60cd8c7f315cc372aae7 Passed Non-regression LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 199158 W: 50655 L: 50617 D: 97886 Ptnml(0-2): 103, 21579, 56182, 21607, 108 https://tests.stockfishchess.org/tests/view/67dcdc5b8c7f315cc372ac12 closes https://github.com/official-stockfish/Stockfish/pull/5945 Bench: 2069191	2025-04-02 17:37:02 +02:00
Shawn XuandDisservin	ee35a51c40	Remove extra division ... closes https://github.com/official-stockfish/Stockfish/pull/5943 No functional change	2025-04-02 17:34:37 +02:00
Shawn XuandDisservin	c2ff7a95c3	Cleanup fused updates ... Passed Non-regression STC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 70656 W: 18257 L: 18077 D: 34322 Ptnml(0-2): 217, 7912, 18879, 8114, 206 https://tests.stockfishchess.org/tests/view/67e23ae78888403457d876d4 closes https://github.com/official-stockfish/Stockfish/pull/5941 No functional change	2025-04-02 17:34:31 +02:00
Shawn XuandDisservin	9045f17c3f	Simplify captures PCM ... Passed Non-regression STC: LLR: 2.92 (-2.94,2.94) <-1.75,0.25> Total: 229856 W: 59258 L: 59252 D: 111346 Ptnml(0-2): 746, 27330, 58714, 27448, 690 https://tests.stockfishchess.org/tests/view/67d3fdac517865b4a2dfcef4 Passed Non-regression LTC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 107652 W: 27470 L: 27338 D: 52844 Ptnml(0-2): 56, 11646, 30280, 11798, 46 https://tests.stockfishchess.org/tests/view/67d5f972517865b4a2dfd2ec closes https://github.com/official-stockfish/Stockfish/pull/5931 Bench: 1842520	2025-03-21 11:19:45 +01:00
Shawn XuandDisservin	fc0e0a44d4	Refactor accumulator storage/updates ... Passed Non-regression STC: LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 115840 W: 29983 L: 29854 D: 56003 Ptnml(0-2): 338, 12990, 31149, 13091, 352 https://tests.stockfishchess.org/tests/view/67d0a044166a3e8781d84223 closes https://github.com/official-stockfish/Stockfish/pull/5927 No functional change	2025-03-21 11:12:47 +01:00
Shawn XuandDisservin	66aee01bb1	Simplify Return Value Adjustment Condition ... Passed Non-regression STC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 82112 W: 21281 L: 21110 D: 39721 Ptnml(0-2): 258, 9630, 21112, 9795, 261 https://tests.stockfishchess.org/tests/view/67c42528b7226b5d8a2dd3a0 Passed Non-regression LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 182652 W: 46295 L: 46240 D: 90117 Ptnml(0-2): 103, 20025, 51003, 20104, 91 https://tests.stockfishchess.org/tests/view/67c4d56b685e87e15e7c43d8 closes https://github.com/official-stockfish/Stockfish/pull/5925 Bench: 1711791	2025-03-21 11:11:12 +01:00
Shawn XuandDisservin	e3660b47bd	Add dbg_clear helper function ... closes https://github.com/official-stockfish/Stockfish/pull/5921 No functional change	2025-03-21 11:09:28 +01:00
Shawn XuandDisservin	b825ea6e57	Improve Perft Testing ... Added #5909 problematic position and chess-library DFRC positions to perft testing. Additional work done by @Disservin to clean up and improve error reporting. closes https://github.com/official-stockfish/Stockfish/pull/5917 No functional change Co-authored-by: disservin <disservin.social@gmail.com>	2025-03-21 11:03:31 +01:00
4 people	99d32e395e	Reapply #5909 ... This version fixes the logic of `gives_check`, which was identified to be the cause of illegal moves. closes https://github.com/official-stockfish/Stockfish/pull/5914 No functional change Co-authored-by: Robert Nürnberg <robert.nurnberg@gmx.de> Co-authored-by: gab8192 <gabrilomba57@gmail.com>	2025-03-21 11:02:19 +01:00
Shawn XuandDisservin	09faa62621	Simplify NMP Conditions ... Passed Non-regression STC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 142400 W: 36883 L: 36779 D: 68738 Ptnml(0-2): 467, 16804, 36571, 16874, 484 https://tests.stockfishchess.org/tests/view/67bd1898e4a8d7152b974ef1 Passed Non-regression LTC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 251868 W: 63905 L: 63920 D: 124043 Ptnml(0-2): 133, 27480, 70708, 27495, 118 https://tests.stockfishchess.org/tests/view/67bd1898e4a8d7152b974ef1 closes https://github.com/official-stockfish/Stockfish/pull/5906 Bench: 2188400	2025-02-27 20:31:04 +01:00
Shawn XuandDisservin	43b2d65d72	Add scaling note to futility pruning ... Note that both patches below effectively reduces the frequency of futility pruning. Passed STC: LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 51680 W: 13599 L: 13253 D: 24828 Ptnml(0-2): 217, 6056, 12959, 6380, 228 https://tests.stockfishchess.org/tests/view/67ac218fa04df5eb8dbebf26 Passed LTC: LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 51798 W: 13338 L: 12986 D: 25474 Ptnml(0-2): 42, 5584, 14310, 5906, 57 https://tests.stockfishchess.org/tests/view/67acf04152879dfd14d7e846 Regression at STC SMP: LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 231552 W: 60226 L: 59642 D: 111684 Ptnml(0-2): 565, 25994, 62031, 26664, 522 https://tests.stockfishchess.org/tests/view/67ae390c1a4c73ae1f930dbf Passed STC: LLR: 2.93 (-2.94,2.94) <0.00,2.00> Total: 22560 W: 6022 L: 5725 D: 10813 Ptnml(0-2): 87, 2524, 5762, 2819, 88 https://tests.stockfishchess.org/tests/view/67ac202aa04df5eb8dbebf22 Passed LTC: LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 66138 W: 16953 L: 16572 D: 32613 Ptnml(0-2): 62, 7103, 18360, 7480, 64 https://tests.stockfishchess.org/tests/view/67ad47d852879dfd14d7e899 Regression at VVLTC SMP: LLR: -2.94 (-2.94,2.94) <-1.75,0.25> Total: 29138 W: 7408 L: 7655 D: 14075 Ptnml(0-2): 0, 2816, 9189, 2559, 5 https://tests.stockfishchess.org/tests/view/67b159ce6c6b9e172ad1598f closes https://github.com/official-stockfish/Stockfish/pull/5888 No functional change	2025-02-24 19:09:52 +01:00
Shawn XuandJoost VandeVondele	d66e603070	Increase PCM bonus when cutOffCnt is low ... Passed STC: LLR: 2.95 (-2.94,2.94) <0.00,2.00> Total: 36832 W: 9763 L: 9438 D: 17631 Ptnml(0-2): 159, 4267, 9254, 4562, 174 https://tests.stockfishchess.org/tests/view/67a29dbafedef70e42ac329a Passed LTC: LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 19728 W: 5124 L: 4839 D: 9765 Ptnml(0-2): 18, 2029, 5485, 2314, 18 https://tests.stockfishchess.org/tests/view/67a2a1abfedef70e42ac32b7 closes https://github.com/official-stockfish/Stockfish/pull/5865 Bench: 3197798	2025-02-05 19:00:25 +01:00
Shawn XuandDisservin	8c73472ac8	Simplify depth increase condition further ... Passed Non-regression STC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 51232 W: 13560 L: 13351 D: 24321 Ptnml(0-2): 183, 6075, 12920, 6226, 212 https://tests.stockfishchess.org/tests/view/679d7b2b0774dfd78deb043f Passed Non-regression LTC (v. #5827): LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 172398 W: 44108 L: 44042 D: 84248 Ptnml(0-2): 122, 19207, 47489, 19245, 136 https://tests.stockfishchess.org/tests/view/679d7fb10774dfd78deb05d2 Passed Non-regression VLTC (v. #5827): LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 388540 W: 99314 L: 99464 D: 189762 Ptnml(0-2): 89, 40454, 113350, 40272, 105 https://tests.stockfishchess.org/tests/view/679da3be0774dfd78deb0ad4 closes https://github.com/official-stockfish/Stockfish/pull/5846 Bench: 2688175	2025-02-04 21:11:37 +01:00
Shawn XuandDisservin	344e89275a	Simplify Away Quadruple Extensions ... Passed Non-regression LTC: LLR: 2.96 (-2.94,2.94) <-1.75,0.25> Total: 95856 W: 24551 L: 24404 D: 46901 Ptnml(0-2): 85, 10621, 26364, 10778, 80 https://tests.stockfishchess.org/tests/view/679a9aedae346be6da0eebd6 Passed Non-regression VLTC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 157536 W: 40000 L: 39921 D: 77615 Ptnml(0-2): 43, 16416, 45775, 16487, 47 https://tests.stockfishchess.org/tests/view/679aed8f51037ccaf3e30fbf Passed Non-regression VVLTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 51598 W: 13345 L: 13172 D: 25081 Ptnml(0-2): 0, 4735, 16162, 4896, 6 https://tests.stockfishchess.org/tests/view/679d368b0774dfd78deb0163 closes https://github.com/official-stockfish/Stockfish/pull/5843 Bench: 2399312	2025-02-02 13:44:22 +01:00
Shawn XuandDisservin	4a77fb213f	Clean up corrhist ... Passed Non-regression STC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 89056 W: 23225 L: 23067 D: 42764 Ptnml(0-2): 292, 9688, 24470, 9726, 352 https://tests.stockfishchess.org/tests/view/679816b2ae346be6da0ee8e7 closes https://github.com/official-stockfish/Stockfish/pull/5830 Bench: 1767398	2025-02-02 13:33:35 +01:00
3 people	889fed448c	Better nonpawn indexing ... Improves indexing scheme, by noting that both sides are likely to access the same non_pawn_index nearby. LLR: 2.93 (-2.94,2.94) <0.00,2.00> Total: 75936 W: 19905 L: 19554 D: 36477 Ptnml(0-2): 190, 7863, 21554, 8128, 233 https://tests.stockfishchess.org/tests/view/67904d0cfc8c306ba6cea332 closes https://github.com/official-stockfish/Stockfish/pull/5816 No functional change Co-authored-by: Andrew Grant <andrew.github@grantnet.us>	2025-01-25 20:53:53 +01:00
Shawn XuandJoost VandeVondele	d606311e55	Fix undefined behavior ... From cppreference: "It is undefined behavior to read from the member of the union that wasn't most recently written. Many compilers implement, as a non-standard language extension, the ability to read inactive members of a union." closes https://github.com/official-stockfish/Stockfish/pull/5811 no functional change	2025-01-25 20:33:43 +01:00
Shawn XuandJoost VandeVondele	e7367cef0f	Clean up pack reordering ... closes https://github.com/official-stockfish/Stockfish/pull/5802 no functional change	2025-01-25 20:17:39 +01:00
Shawn XuandJoost VandeVondele	62ecdfe82c	simplify accumulator updates ... After #5759 accumulator updates are strictly on a per-move basis. Therefore, the generic code for updating multiple moves at once is no longer needed. Passed Non-regression STC: LLR: 3.00 (-2.94,2.94) <-1.75,0.25> Total: 81696 W: 21204 L: 21039 D: 39453 Ptnml(0-2): 210, 8431, 23416, 8566, 225 https://tests.stockfishchess.org/tests/view/67823a24a31c4c13e83518a8 closes https://github.com/official-stockfish/Stockfish/pull/5760 no functional change	2025-01-25 20:09:09 +01:00
Shawn XuandJoost VandeVondele	738ac2a100	tuned TM values ... Tuned 70k games at 240+2.4 th 2: https://tests.stockfishchess.org/tests/view/6783b1b16ddf09c0b4b703f5 Failed STC: LLR: -2.93 (-2.94,2.94) <0.00,2.00> Total: 491872 W: 128260 L: 127804 D: 235808 Ptnml(0-2): 1579, 55449, 131572, 55609, 1727 https://tests.stockfishchess.org/tests/view/6785a045460e2910c51de4b8 Passed LTC: LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 154824 W: 39315 L: 38874 D: 76635 Ptnml(0-2): 110, 15809, 45147, 16222, 124 https://tests.stockfishchess.org/tests/view/678ac722c00c743bc9e9fc35 Passed VLTC: LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 77404 W: 19825 L: 19452 D: 38127 Ptnml(0-2): 18, 7262, 23765, 7643, 14 https://tests.stockfishchess.org/tests/view/678b2a98c00c743bc9ea048c closes https://github.com/official-stockfish/Stockfish/pull/5796 No functional change	2025-01-18 21:24:01 +01:00
Shawn XuandJoost VandeVondele	ccbd060b01	simplify razoring ... Passed Non-regression STC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 93056 W: 24215 L: 24054 D: 44787 Ptnml(0-2): 364, 11085, 23470, 11244, 365 https://tests.stockfishchess.org/tests/view/67883a5d3b8f206a2696b804 Passed Non-regression LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 66564 W: 16971 L: 16794 D: 32799 Ptnml(0-2): 56, 7403, 18192, 7570, 61 https://tests.stockfishchess.org/tests/view/6789ffa78082388fa0cbfe95 closes https://github.com/official-stockfish/Stockfish/pull/5788 bench 1500649	2025-01-18 20:54:55 +01:00
Shawn XuandDisservin	921361829a	Simplify away capthist bonus in Probcut ... The explicit bonus has been obsoleted with the introduction of #5695 Passed Non-regression STC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 132832 W: 34519 L: 34403 D: 63910 Ptnml(0-2): 430, 15754, 33931, 15872, 429 https://tests.stockfishchess.org/tests/view/678158c49168c8bf30927834 Passed Non-regression LTC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 123492 W: 31426 L: 31309 D: 60757 Ptnml(0-2): 79, 13705, 34051, 13842, 69 https://tests.stockfishchess.org/tests/view/6782b07e6ddf09c0b4b6dbb7 closes https://github.com/official-stockfish/Stockfish/pull/5761 Bench: 1180439	2025-01-12 21:23:29 +01:00
Shawn XuandDisservin	8d517bddff	Simplify accumulator updates ... AMD Ryzen 5 7600X ``` sf_base = 1902646 +/- 2114 (95%) sf_test = 1920873 +/- 2515 (95%) diff = 18227 +/- 3067 (95%) speedup = 0.95800% +/- 0.161% (95%) ``` Ryzen 9 5950X ``` sf_base = 1413387 +/- 3592 (95%) sf_test = 1437893 +/- 3355 (95%) diff = 24505 +/- 4669 (95%) speedup = 1.73380% +/- 0.330% (95%) ``` Intel Core i7-6700K ``` sf_base = 912476 +/- 1863 (95%) sf_test = 921864 +/- 2042 (95%) diff = 9388 +/- 3333 (95%) speedup = 1.02893% +/- 0.365% (95%) ``` Raspberry Pi 5 ``` sf_base = 260993 +/- 1508 (95%) sf_test = 262912 +/- 1746 (95%) diff = 1918 +/- 1221 (95%) speedup = 0.73504% +/- 0.468% (95%) ``` Passed Non-regression STC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 23072 W: 6041 L: 5813 D: 11218 Ptnml(0-2): 61, 2435, 6319, 2657, 64 https://tests.stockfishchess.org/tests/view/6780a0ca9168c8bf30927757 closes https://github.com/official-stockfish/Stockfish/pull/5759 No functional change	2025-01-12 21:21:53 +01:00
Shawn XuandDisservin	28c07fb456	Simplify Probcut Condition ... Rebased and properly guarded #5720 Passed Non-regression STC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 179616 W: 45764 L: 45706 D: 88146 Ptnml(0-2): 125, 19665, 50162, 19739, 117 https://tests.stockfishchess.org/tests/view/677590531a2f267f20548b82 Passed Non-regression LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 445728 W: 113467 L: 113682 D: 218579 Ptnml(0-2): 331, 49226, 123900, 49141, 266 https://tests.stockfishchess.org/tests/view/67734f351a2f267f205489d9 closes https://github.com/official-stockfish/Stockfish/pull/5758 Bench: 1180421	2025-01-12 21:18:39 +01:00
Shawn XuandDisservin	403a5e100b	Simplify Fail-Low Bonus ... Passed Non-regression STC: LLR: 2.92 (-2.94,2.94) <-1.75,0.25> Total: 66592 W: 17426 L: 17239 D: 31927 Ptnml(0-2): 208, 7812, 17109, 7919, 248 https://tests.stockfishchess.org/tests/view/6774e1711a2f267f20548b22 Passed Non-regression LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 179616 W: 45764 L: 45706 D: 88146 Ptnml(0-2): 125, 19665, 50162, 19739, 117 https://tests.stockfishchess.org/tests/view/677590531a2f267f20548b82 closes https://github.com/official-stockfish/Stockfish/pull/5751 Bench: 1310158	2025-01-12 21:14:11 +01:00
Shawn XuandDisservin	5370c3035e	Refactor Stats Array ... * Limit use of `StatsEntry` wrapper to arithmetic types * Generalize `Stats` to `MultiArray` by discarding the template parameter `D` * Allow `MultiArray::fill` to take any type assignable to element type * Remove now-unused operator overloads on `StatsEntry` closes https://github.com/official-stockfish/Stockfish/pull/5750 No functional change	2025-01-12 21:13:14 +01:00
Shawn XuandDisservin	c47e6fcf84	Small cleanup of nnue_feature_transformer.h ... Passed Non-regression STC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 285760 W: 73716 L: 73768 D: 138276 Ptnml(0-2): 777, 30775, 79851, 30677, 800 https://tests.stockfishchess.org/tests/view/676f78681a2f267f205485aa closes https://github.com/official-stockfish/Stockfish/pull/5745 No functional change	2025-01-12 21:11:59 +01:00
Shawn XuandDisservin	d1a1ff4f17	Simplify Razoring ... Passed Non-regression STC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 95584 W: 24906 L: 24750 D: 45928 Ptnml(0-2): 285, 11227, 24632, 11343, 305 https://tests.stockfishchess.org/tests/view/675e0ed286d5ee47d95429ee Passed Non-regression LTC: LLR: 2.96 (-2.94,2.94) <-1.75,0.25> Total: 191292 W: 48637 L: 48589 D: 94066 Ptnml(0-2): 97, 21061, 53276, 21121, 91 https://tests.stockfishchess.org/tests/view/675f08c686d5ee47d9542be3 closes https://github.com/official-stockfish/Stockfish/pull/5724 Bench: 1286274	2025-01-12 21:11:27 +01:00
Shawn XuandDisservin	5488dd2f91	Update Copyright Year ... closes https://github.com/official-stockfish/Stockfish/pull/5747 No functional change	2025-01-06 00:45:28 +01:00
Shawn XuandDisservin	00da3ff463	Cleanup stats entry ... Prevents potential issue caused by publicly inheriting from STL container types closes https://github.com/official-stockfish/Stockfish/pull/5746 No functional change	2025-01-06 00:44:25 +01:00
Shawn XuandDisservin	5cf6f99177	Remove some incorrectly marked const qualifiers ... closes https://github.com/official-stockfish/Stockfish/pull/5744 No functional change	2025-01-06 00:43:49 +01:00
Shawn XuandDisservin	78b5733939	Simplify post-lmr conthist bonus ... Passed Non-regression STC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 49184 W: 12735 L: 12528 D: 23921 Ptnml(0-2): 134, 5746, 12647, 5909, 156 https://tests.stockfishchess.org/tests/view/6765cd2e86d5ee47d954420e Passed Non-regression LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 177270 W: 45227 L: 45166 D: 86877 Ptnml(0-2): 132, 19498, 49302, 19583, 120 https://tests.stockfishchess.org/tests/view/676721fd86d5ee47d9544489 closes https://github.com/official-stockfish/Stockfish/pull/5734 Bench: 1042099	2025-01-06 00:43:37 +01:00
Shawn XuandDisservin	e7e78aa09e	Adjust LMR with correction history ... A positive constant increase in base reduction is applied to counter the decrease in average reduction from this tweak. Passed STC: LLR: 2.98 (-2.94,2.94) <0.00,2.00> Total: 109216 W: 28415 L: 27989 D: 52812 Ptnml(0-2): 310, 12848, 27911, 13184, 355 https://tests.stockfishchess.org/tests/view/6760bb0e86d5ee47d9542f26 Passed LTC: LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 66918 W: 17073 L: 16694 D: 33151 Ptnml(0-2): 33, 7175, 18666, 7550, 35 https://tests.stockfishchess.org/tests/view/6761e10f86d5ee47d95431fa closes https://github.com/official-stockfish/Stockfish/pull/5727 Bench: 1294909	2024-12-22 15:26:39 +01:00
Shawn XuandDisservin	6075e787d0	Add CI test with glibcxx assertions enabled ... Re: https://github.com/official-stockfish/Stockfish/pull/5721#pullrequestreview-2504542601 closes https://github.com/official-stockfish/Stockfish/pull/5723 No functional change	2024-12-22 15:20:25 +01:00
Shawn XuandDisservin	77ec878ffa	Prevent out of bounds access of dbg info arrays ... closes https://github.com/official-stockfish/Stockfish/pull/5721 No functional change	2024-12-22 15:19:13 +01:00
Shawn XuandDisservin	e770b55f7f	Remove Extraneous Parenthesis ... No longer needed after https://github.com/official-stockfish/Stockfish/pull/5667. closes https://github.com/official-stockfish/Stockfish/pull/5717 No functional change	2024-12-22 15:17:33 +01:00
Shawn XuandDisservin	b822fdf2f2	Tune histories ... Passed STC: LLR: 2.93 (-2.94,2.94) <0.00,2.00> Total: 268736 W: 70080 L: 69421 D: 129235 Ptnml(0-2): 831, 31795, 68460, 32448, 834 https://tests.stockfishchess.org/tests/view/6750778886d5ee47d9540e7c Passed LTC: LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 505356 W: 129145 L: 127868 D: 248343 Ptnml(0-2): 307, 54901, 140959, 56230, 281 https://tests.stockfishchess.org/tests/view/675367de86d5ee47d9541536 closes https://github.com/official-stockfish/Stockfish/pull/5712 Bench: 1148169	2024-12-22 15:14:22 +01:00
Shawn XuandDisservin	6a8478c6ad	Simplify Prior Capture Countermove Bonus ... Passed Non-regression STC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 184032 W: 47626 L: 47568 D: 88838 Ptnml(0-2): 590, 21808, 47238, 21714, 666 https://tests.stockfishchess.org/tests/view/67412c7686d5ee47d953f743 Passed Non-regression LTC: LLR: 2.96 (-2.94,2.94) <-1.75,0.25> Total: 169218 W: 43395 L: 43323 D: 82500 Ptnml(0-2): 302, 18567, 46791, 18655, 294 https://tests.stockfishchess.org/tests/view/6743b7e086d5ee47d953f9a6 closes https://github.com/official-stockfish/Stockfish/pull/5701 Bench: 1130692	2024-12-08 19:55:10 +01:00
Shawn XuandDisservin	b7f17346e5	Fix Sanitizer Tests ... closes https://github.com/official-stockfish/Stockfish/pull/5692 No functional change	2024-11-22 23:41:34 +01:00
Shawn XuandDisservin	4fcd78ceb4	Simplify Probcut Bonus ... Passed STC: LLR: 2.99 (-2.94,2.94) <-1.75,0.25> Total: 172288 W: 44656 L: 44580 D: 83052 Ptnml(0-2): 507, 20650, 43782, 20670, 535 https://tests.stockfishchess.org/tests/view/673b74f986d5ee47d953f1a3 Passed LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 94596 W: 24098 L: 23953 D: 46545 Ptnml(0-2): 57, 10322, 26393, 10471, 55 https://tests.stockfishchess.org/tests/view/673d191886d5ee47d953f337 closes https://github.com/official-stockfish/Stockfish/pull/5688 Bench: 1031022	2024-11-22 23:31:34 +01:00
Shawn XuandDisservin	cc5c67c564	Introduce Fractional LMR ... Tuning Run (90k Games): https://tests.stockfishchess.org/tests/view/67202b1c86d5ee47d953d442 Passed STC: LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 241024 W: 62616 L: 62001 D: 116407 Ptnml(0-2): 716, 28231, 62015, 28822, 728 https://tests.stockfishchess.org/tests/view/6725196786d5ee47d953d9f2 Passed LTC: LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 92532 W: 23678 L: 23246 D: 45608 Ptnml(0-2): 45, 9981, 25797, 10383, 60 https://tests.stockfishchess.org/tests/view/6727d3cb86d5ee47d953db9d closes https://github.com/official-stockfish/Stockfish/pull/5667 Bench: 1066071	2024-11-13 20:12:47 +01:00
Shawn XuandDisservin	c2611efe5c	Move history code to a separate header ... Since no correction histories are ever used inside Movepick, and many existing histories are closely integrated into search, it might be more logical to separate them into their own header. PR based on #5650 closes https://github.com/official-stockfish/Stockfish/pull/5652 No functional change	2024-11-13 20:07:15 +01:00
Shawn XuandDisservin	4a9c980f3b	Template Corrhist ... Avoids duplication of `using ... = Stats<int16_t, CORRECTION_HISTORY_LIMIT, COLOR_NB, CORRECTION_HISTORY_SIZE>;` closes https://github.com/official-stockfish/Stockfish/pull/5650 No functional change Co-authored-by: Disservin <disservin.social@gmail.com>	2024-10-31 09:27:12 +01:00
Shawn XuandDisservin	b261df970d	Fix majorPieceKey Updates ... Passed STC: LLR: 2.98 (-2.94,2.94) <0.00,2.00> Total: 476160 W: 124285 L: 123311 D: 228564 Ptnml(0-2): 1662, 56266, 121219, 57302, 1631 https://tests.stockfishchess.org/tests/view/66ea3dc186d5ee47d953ae07 Failed Yellow LTC: LLR: -2.94 (-2.94,2.94) <0.50,2.50> Total: 230634 W: 58525 L: 58295 D: 113814 Ptnml(0-2): 113, 25301, 64299, 25451, 153 https://tests.stockfishchess.org/tests/view/66f1825e86d5ee47d953b2ec Passed Non-regression LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 112344 W: 28590 L: 28462 D: 55292 Ptnml(0-2): 71, 12439, 31039, 12537, 86 https://tests.stockfishchess.org/tests/view/6707474486d5ee47d953bfe3 closes https://github.com/official-stockfish/Stockfish/pull/5629 Bench: 1283457	2024-10-12 16:40:49 +02:00
Shawn XuandJoost VandeVondele	d6043970bd	Make Correction History Size Uniform ... Passed Non-regression STC: LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 207232 W: 53834 L: 53802 D: 99596 Ptnml(0-2): 695, 24486, 53200, 24562, 673 https://tests.stockfishchess.org/tests/view/66e9f5a886d5ee47d953ada1 Passed Non-regression LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 99120 W: 25264 L: 25123 D: 48733 Ptnml(0-2): 66, 10803, 27675, 10956, 60 https://tests.stockfishchess.org/tests/view/66ed7ebc86d5ee47d953b056 Passed Non-regression LTC vs #5606: LLR: 2.96 (-2.94,2.94) <-1.75,0.25> Total: 208950 W: 53049 L: 53019 D: 102882 Ptnml(0-2): 111, 23232, 57760, 23260, 112 https://tests.stockfishchess.org/tests/view/66f1843886d5ee47d953b2f2 closes https://github.com/official-stockfish/Stockfish/pull/5609 bench 1575189	2024-09-28 18:01:31 +02:00
Shawn XuandDisservin	60351b9df9	Introduce Various Correction histories ... This patch introduces three additional correction histories, namely, Major Piece Correction History, Minor Piece Correction History, and Non-Pawn Correction History. Introduced by @mcthouacbb in Sirius (https://github.com/mcthouacbb/Sirius) chess engine. The Major Piece Correction History is indexed by side-to-move and the Zobrist key representing the position of the King, Rook, and Queen of both sides. Likewise, the Minor Piece Correction History is indexed by side-to-move and the Zobrist key representing the position of the King, Knight, and Bishop of both sides. Also See: https://github.com/mcthouacbb/Sirius/commit/97b85bbaac88ff5a0f63e28776027dd3de77164e https://github.com/mcthouacbb/Sirius/commit/3099cdef2f13e29805654b5f8153e6ecd5853195 Introduced by @zzzzz151 in Starzix (https://github.com/zzzzz151/Starzix) chess engine. Non-Pawn correction history consists of side-to-move, side of Zobrist key, and a Zobrist key representing of the position of all non-pawn pieces of **one side**. The non-pawn correction values for both key sides are then summed. Also See: https://github.com/zzzzz151/Starzix/commit/34911772f178c27b3a239dda0acb79c397c3a2f0 https://github.com/zzzzz151/Starzix/commit/33e0df8dd2db1d4775974ab12e3390154697f47a The weights on the final correction value of the above correction histories, as well as existing correction histories, are then tuned in two separate SPSA sessions, totaling 75k games. SPSA1: https://tests.stockfishchess.org/tests/view/66e5243886d5ee47d953a86b (Stopped early due to some weights reaching the maximum value) SPSA2: https://tests.stockfishchess.org/tests/view/66e6a26f86d5ee47d953a965 Also thanks to @martinnovaak, (Motor https://github.com/martinnovaak/motor author) for insights and suggestions. Passed STC: LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 23328 W: 6197 L: 5901 D: 11230 Ptnml(0-2): 82, 2582, 6041, 2876, 83 https://tests.stockfishchess.org/tests/view/66e8787b86d5ee47d953ab6f Passed LTC: LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 10626 W: 2826 L: 2560 D: 5240 Ptnml(0-2): 4, 1054, 2941, 1300, 14 https://tests.stockfishchess.org/tests/view/66e8ab2386d5ee47d953aba8 closes https://github.com/official-stockfish/Stockfish/pull/5598 Bench: 1011161	2024-09-17 21:01:43 +02:00
Shawn XuandDisservin	5ce7f866a5	Simplify Fail Low Bonus ... Passed Non-regression STC: LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 302528 W: 78190 L: 78264 D: 146074 Ptnml(0-2): 1029, 35797, 77551, 35993, 894 https://tests.stockfishchess.org/tests/view/66dcebdedc53972b68218c7e Passed Non-regression LTC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 122754 W: 31025 L: 30907 D: 60822 Ptnml(0-2): 74, 13597, 33908, 13733, 65 https://tests.stockfishchess.org/tests/view/66e0c38686d5ee47d953a481 closes https://github.com/official-stockfish/Stockfish/pull/5594 Bench: 1646373	2024-09-17 20:50:30 +02:00
Shawn XuandDisservin	ddc9f48bc3	Introduce Material Correction History ... Idea from Caissa (https://github.com/Witek902/Caissa) chess engine. Add a secondary correction history indexed by the material key of a position. The material key is the zobrist hash representing the number of pieces left in a position. Passed STC: LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 189472 W: 49360 L: 48813 D: 91299 Ptnml(0-2): 666, 22453, 47953, 22996, 668 https://tests.stockfishchess.org/tests/view/66cbddafbf8c9d8780fda9f1 Passed LTC: LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 224190 W: 57022 L: 56312 D: 110856 Ptnml(0-2): 197, 24723, 61540, 25443, 192 https://tests.stockfishchess.org/tests/view/66cd529bbf8c9d8780fdab4c closes https://github.com/official-stockfish/Stockfish/pull/5556 Bench: 1462697	2024-09-09 17:43:05 +02:00
Shawn XuandJoost VandeVondele	d275bf9643	Introduce Fail Low History Bonus ... When a node fails low, give TT move a small bonus 1/4 of normal value. Passed STC: LLR: 2.95 (-2.94,2.94) <0.00,2.00> Total: 92384 W: 24094 L: 23691 D: 44599 Ptnml(0-2): 323, 10852, 23465, 11203, 349 https://tests.stockfishchess.org/tests/view/66be80794ff211be9d4eed68 Passed LTC: LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 114660 W: 29260 L: 28778 D: 56622 Ptnml(0-2): 97, 12506, 31653, 12966, 108 https://tests.stockfishchess.org/tests/view/66bf63ee4ff211be9d4eeef0 closes https://github.com/official-stockfish/Stockfish/pull/5539 bench 1463003	2024-08-20 21:34:19 +02:00
Shawn XuandJoost VandeVondele	87814d2fb8	Simplify doShallowerSearch ... Passed Non-regression STC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 242336 W: 62657 L: 62663 D: 117016 Ptnml(0-2): 941, 28949, 61418, 28895, 965 https://tests.stockfishchess.org/tests/view/66bc13c34ff211be9d4ee794 Passed Non-regression LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 128100 W: 32503 L: 32390 D: 63207 Ptnml(0-2): 106, 14319, 35113, 14380, 132 https://tests.stockfishchess.org/tests/view/66bdbb304ff211be9d4eec5d closes https://github.com/official-stockfish/Stockfish/pull/5537 bench 1586246	2024-08-20 21:27:58 +02:00