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Author	SHA1	Message	Date
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
Robert Nurnberg @ elitebookandJoost VandeVondele	222df615c1	revert #6259 ... The recent commit af181d9 was merged as a simplification, but unfortunately hurts mate finding efficiency. https://github.com/vondele/matetrack/blob/69f5c5e8627c163a6a8480b869ee09bc44dc44d4/matetrack1000000.csv#L4075-L4076 So this PR proposes to revert it, while adding a comment in the code for future reference. closes https://github.com/official-stockfish/Stockfish/pull/6269 Bench: 2566711	2025-08-30 15:06:57 +02:00
Nonlinear2andJoost VandeVondele	75f07da912	Avoid high rule50 count zeroing cutoffs ... If the depth is low enough, don't TT cut if the rule50 count is high and the TT move is zeroing. Passed STC: https://tests.stockfishchess.org/tests/view/68a8fdd8b6fb3300203bcb92 LLR: 3.05 (-2.94,2.94) <0.00,2.00> Total: 110304 W: 28805 L: 28402 D: 53097 Ptnml(0-2): 275, 11174, 31875, 11529, 299 Passed LTC: https://tests.stockfishchess.org/tests/view/68aa200f75da51a345a5a809 LLR: 3.00 (-2.94,2.94) <0.50,2.50> Total: 187956 W: 48489 L: 47928 D: 91539 Ptnml(0-2): 59, 16118, 61075, 16655, 71 closes https://github.com/official-stockfish/Stockfish/pull/6271 bench: 2641840	2025-08-30 15:05:11 +02:00
Akshat SinhaandJoost VandeVondele	69de394439	fix ppc altivec check & loongarch64-lsx typo ... closes https://github.com/official-stockfish/Stockfish/pull/6276 No functional change	2025-08-30 15:03:09 +02:00
Sebastian BuchwaldandJoost VandeVondele	cb7232a818	Use integer type for UCI spin values ... In particular, parse spin values as integers to avoid rounding errors. Fixes https://github.com/official-stockfish/Stockfish/issues/6263 closes https://github.com/official-stockfish/Stockfish/pull/6264 No functional change	2025-08-30 15:02:05 +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
Stefan GeschwentnerandJoost VandeVondele	39c077f15a	Less reduction for later threads. ... Give "(thread id mod 8) * 64" less reductions (up to nearly a half ply). Passed SMP STC: LLR: 2.95 (-2.94,2.94) <0.00,2.00> Total: 413176 W: 106496 L: 105666 D: 201014 Ptnml(0-2): 504, 46732, 111266, 47602, 484 https://tests.stockfishchess.org/tests/view/68a24aeeb6fb3300203bbdc4 Passed SMP LTC: LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 60420 W: 15622 L: 15268 D: 29530 Ptnml(0-2): 11, 6106, 17632, 6440, 21 https://tests.stockfishchess.org/tests/view/68a2c2ffb6fb3300203bc516 closes https://github.com/official-stockfish/Stockfish/pull/6249 No functional change	2025-08-24 20:07:50 +02:00
FauziAkramandJoost VandeVondele	c99eb8ef32	Remove cap from a bonusScale formula ... Passed STC: LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 127264 W: 33159 L: 33042 D: 61063 Ptnml(0-2): 336, 14509, 33866, 14544, 377 https://tests.stockfishchess.org/tests/view/68a63fccb6fb3300203bc818 Passed LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 469512 W: 120094 L: 120331 D: 229087 Ptnml(0-2): 238, 51317, 131885, 51076, 240 https://tests.stockfishchess.org/tests/view/68a8d867b6fb3300203bcab5 closes https://github.com/official-stockfish/Stockfish/pull/6260 Bench: 2433974	2025-08-24 20:01:01 +02:00
Michael ChalyandJoost VandeVondele	af181d9fe1	Small simplification in probCut movepicker ... Remove no longer required condition for tt moves. The idea is that if tt the value is greater than probCut beta try tt move that is a capture anyway - even if it doesn't pass SEE check. This idea in various implementations passed some STCs and was looking decent at LTCs as a gainer. Passed STC: https://tests.stockfishchess.org/tests/view/68aa1ee075da51a345a5a805 LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 136160 W: 35189 L: 35079 D: 65892 Ptnml(0-2): 436, 16083, 34891, 16275, 395 Passed LTC: https://tests.stockfishchess.org/tests/view/68aa91d375da51a345a5a884 LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 80022 W: 20652 L: 20492 D: 38878 Ptnml(0-2): 33, 8717, 22357, 8865, 39 closes https://github.com/official-stockfish/Stockfish/pull/6259 Bench: 2307940	2025-08-24 19:58:49 +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
Daniel MonroeandJoost VandeVondele	7fa7a36dc6	Remove upper bound in see margin ... Passed simplification STC LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 99840 W: 25965 L: 25815 D: 48060 Ptnml(0-2): 326, 11708, 25688, 11886, 312 https://tests.stockfishchess.org/tests/view/68a24504b6fb3300203bbdae Passed simplification LTC LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 248388 W: 63544 L: 63556 D: 121288 Ptnml(0-2): 125, 27132, 69709, 27086, 142 https://tests.stockfishchess.org/tests/view/68a24f3bb6fb3300203bbdee closes https://github.com/official-stockfish/Stockfish/pull/6250 Bench: 2432765	2025-08-24 19:47:20 +02:00
Daniel SamekandJoost VandeVondele	2659351ce7	Remove depth reduction in the full-depth search ... Passed simplification STC: LLR: 2.96 (-2.94,2.94) <-1.75,0.25> Total: 217184 W: 56218 L: 56195 D: 104771 Ptnml(0-2): 627, 25673, 55985, 25664, 643 https://tests.stockfishchess.org/tests/view/68a21e0eb6fb3300203bbcf3 Passed simplification LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 30474 W: 7923 L: 7713 D: 14838 Ptnml(0-2): 20, 3205, 8569, 3431, 12 https://tests.stockfishchess.org/tests/view/68a2adacb6fb3300203bc3f9 closes https://github.com/official-stockfish/Stockfish/pull/6246 bench 2626263	2025-08-24 19:45:23 +02:00
Daniel MonroeandJoost VandeVondele	57d76bd459	Simplify depth condition in prior reduction ... Passed simplification STC LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 172864 W: 45085 L: 45015 D: 82764 Ptnml(0-2): 516, 20456, 44405, 20552, 503 https://tests.stockfishchess.org/tests/view/68a24791b6fb3300203bbdb6 Passed simplification LTC LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 84738 W: 21733 L: 21578 D: 41427 Ptnml(0-2): 49, 9169, 23780, 9320, 51 https://tests.stockfishchess.org/tests/view/68a2665ab6fb3300203bc269 closes https://github.com/official-stockfish/Stockfish/pull/6244 Bench: 2131292	2025-08-24 19:43:48 +02:00
DisservinandJoost VandeVondele	47d60a50b6	CI: fix typo in flag ... closes https://github.com/official-stockfish/Stockfish/pull/6247 No functional change	2025-08-24 19:40:40 +02:00
FauziAkramandJoost VandeVondele	176ef577e2	Set back static constexpr ... closes https://github.com/official-stockfish/Stockfish/pull/6243 No functional change	2025-08-24 19:39:49 +02:00
MyselfandJoost VandeVondele	20bc19558e	Speedup_threat_by_lesser ... This patch could have been considered a non-functional speedup, but changing the ranking of illegal moves. Passed STC: LLR: 2.95 (-2.94,2.94) <0.00,2.00> Total: 131040 W: 34247 L: 33792 D: 63001 Ptnml(0-2): 407, 15281, 33675, 15764, 393 https://tests.stockfishchess.org/tests/live_elo/68a9a75b75da51a345a5a66d Passed LTC: LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 280146 W: 72055 L: 71242 D: 136849 Ptnml(0-2): 153, 30252, 78438, 31089, 141 https://tests.stockfishchess.org/tests/view/68a9f58475da51a345a5a6e0 closes https://github.com/official-stockfish/Stockfish/pull/6261 Bench: 2321931	2025-08-24 19:37:58 +02:00
Stefan GeschwentnerandJoost VandeVondele	d11f49b790	Remove log depth reduction terms. ... Motivated by the elo loss of last VVLTC regression test i remove the new log depth reductions (tuned at STC) to regain strength at VVLTC. The constant terms are adjusted based on the old values and the changes from the last added VVLTC tuning. Passed 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 Passed 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 closes https://github.com/official-stockfish/Stockfish/pull/6257 Bench: 2566780	2025-08-24 19:30:31 +02:00
FauziAkramandJoost VandeVondele	7fe46b5a70	VVLTC tweak ... Passed VVLTC with STC bounds: LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 60796 W: 15908 L: 15609 D: 29279 Ptnml(0-2): 6, 5598, 18889, 5901, 4 https://tests.stockfishchess.org/tests/view/68a1fbfeb6fb3300203bbc5c Passed VVLTC with LTC bounds: LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 24914 W: 6528 L: 6256 D: 12130 Ptnml(0-2): 4, 2263, 7648, 2541, 1 https://tests.stockfishchess.org/tests/view/68a211aeb6fb3300203bbca7 closes https://github.com/official-stockfish/Stockfish/pull/6241 Bench: 2130122	2025-08-17 22:46:04 +02:00
Stefan GeschwentnerandJoost VandeVondele	8ecfc3c89d	Bigger thread dependent initial window. ... Increase the initial delta of the aspiration window by "thread id mod 8". Passed SMP STC: LLR: 2.96 (-2.94,2.94) <0.00,2.00> Total: 106176 W: 27470 L: 27069 D: 51637 Ptnml(0-2): 121, 12032, 28386, 12423, 126 https://tests.stockfishchess.org/tests/view/68a178fab6fb3300203bbaec Passed SMP LTC: LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 133076 W: 34272 L: 33772 D: 65032 Ptnml(0-2): 38, 13709, 38537, 14223, 31 https://tests.stockfishchess.org/tests/view/68a1b5d2b6fb3300203bbb71 closes https://github.com/official-stockfish/Stockfish/pull/6239 No functional change	2025-08-17 22:39:49 +02:00
87andJoost VandeVondele	2176c9387e	Add performance warning comment for vpcompressw ... closes https://github.com/official-stockfish/Stockfish/pull/6237 No functional change	2025-08-17 22:38:09 +02:00
Stefan GeschwentnerandJoost VandeVondele	c56bd10cb5	Fix undefined behavior in stalemate trap detection. ... An important part of it is a function which detects if we can move a king or pawn. If this function called before quiet move generation phase the end of the checked move list is undefined (Thanks to AliceRoselia pointing out we have some problem because of wrong bench in a test). This problem exists also in master but is really rarely triggered (thanks to vondele which found one) but it seen significant more often if the capture order score is increased. This fix now simply assumes in this case (and other similiar cases) that a king or pawn can move without checking any moves. Passed non-regression STC (with default book): LLR: 3.03 (-2.94,2.94) <-1.75,0.25> Total: 203008 W: 52465 L: 52424 D: 98119 Ptnml(0-2): 498, 20293, 59893, 20310, 510 https://tests.stockfishchess.org/tests/view/68a06ec5fd8719b088c8dc1a Passed non-regression STC (with stalemates book): LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 31616 W: 14418 L: 14366 D: 2832 Ptnml(0-2): 1, 189, 15375, 243, 0 https://tests.stockfishchess.org/tests/view/68a07538fd8719b088c8dc1f closes https://github.com/official-stockfish/Stockfish/pull/6235 Bench: 2996176	2025-08-17 22:35:03 +02:00
Joost VandeVondele	4b6b13ce5a	Update sde action to 2.4, switch to 9.33.0 ... older version no longer downloadable. closes https://github.com/official-stockfish/Stockfish/pull/6240 No functional change	2025-08-17 22:32:03 +02:00
Daniel MonroeandJoost VandeVondele	169737a9eb	Simplify dual bonuses ... Merge dual capture/quiet bonuses into one Passed simplification STC LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 223200 W: 57868 L: 57854 D: 107478 Ptnml(0-2): 689, 26441, 57296, 26515, 659 https://tests.stockfishchess.org/tests/view/6898d28e0049e8ccef9d6384 Passed simplification LTC LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 147270 W: 37750 L: 37659 D: 71861 Ptnml(0-2): 84, 15869, 41633, 15970, 79 https://tests.stockfishchess.org/tests/view/68990fe30049e8ccef9d643c closes https://github.com/official-stockfish/Stockfish/pull/6226 Bench: 2996176	2025-08-16 12:12:07 +02:00
Daniel MonroeandJoost VandeVondele	c9c002450a	Simplify depth term in reductions ... Passed simplification STC LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 317344 W: 82352 L: 82442 D: 152550 Ptnml(0-2): 999, 37395, 81907, 37439, 932 https://tests.stockfishchess.org/tests/live_elo/68976798f8a258623dda6c46 Passed simplification LTC LLR: 2.97 (-2.94,2.94) <-1.75,0.25> Total: 291708 W: 74733 L: 74787 D: 142188 Ptnml(0-2): 159, 31813, 81956, 31775, 151 https://tests.stockfishchess.org/tests/live_elo/689791a5f8a258623dda6d03 closes https://github.com/official-stockfish/Stockfish/pull/6225 Bench: 2436991	2025-08-16 12:06:00 +02:00
Kevin LuandJoost VandeVondele	0db4a1bee9	Remove completedDepth condition for SE ... Just removing the term Passed STC: LLR: 3.27 (-2.94,2.94) <-1.75,0.25> Total: 179840 W: 47211 L: 47126 D: 85503 Ptnml(0-2): 567, 17929, 52879, 17942, 603 https://tests.stockfishchess.org/tests/view/688bdd88502b34dd5e7111ea Passed LTC: LLR: 3.26 (-2.94,2.94) <-1.75,0.25> Total: 150708 W: 38738 L: 38637 D: 73333 Ptnml(0-2): 79, 12922, 49262, 13001, 90 https://tests.stockfishchess.org/tests/view/688ce857f17748b4d23c8026 Passed VLTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 288312 W: 74104 L: 74152 D: 140056 Ptnml(0-2): 44, 26732, 90657, 26674, 49 https://tests.stockfishchess.org/tests/view/688ec4f57d68fe4f7f130ee3 closes https://github.com/official-stockfish/Stockfish/pull/6221 functional at higher depths Bench: 3002300	2025-08-16 12:01:19 +02:00
FauziAkramandJoost VandeVondele	d864148595	Simplify beta formula ... Passed STC: LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 152384 W: 39907 L: 39814 D: 72663 Ptnml(0-2): 557, 17958, 39053, 18083, 541 https://tests.stockfishchess.org/tests/view/6890b66692fcad741b804a10 Passed LTC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 98688 W: 25411 L: 25270 D: 48007 Ptnml(0-2): 45, 10692, 27743, 10805, 59 https://tests.stockfishchess.org/tests/view/6896019c618946ab878347b0 closes: https://github.com/official-stockfish/Stockfish/pull/6220 bench: 3002300	2025-08-16 11:57:44 +02:00
Stefan GeschwentnerandJoost VandeVondele	2e91a86354	Add log depth as term to reduction factors. ... Replace most reduction factors with a linear term of the form X + Y * msb(depth) (using msb(depth) as simple and fast approximation for log(depth)) and tune the weights with following SPSA test: https://tests.stockfishchess.org/tests/view/689903860049e8ccef9d6415. Here the tuned values of X[8] and Y[8] were ignored because a simple test with this parameters alone failed badly (https://tests.stockfishchess.org/tests/view/68992b350049e8ccef9d6482). 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 closes https://github.com/official-stockfish/Stockfish/pull/6229 Bench: 3151102	2025-08-16 11:51:39 +02:00
mstemberaandJoost VandeVondele	0383670cd5	Avoid using _mm512_storeu_epi16() ... gcc 9 & 10 do not provide this function, instead use the generic _mm512_storeu_si512 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95483 https://tests.stockfishchess.org/actions?max_actions=1&action=&user=&text=&before=1755266300.455175&run_id= closes https://github.com/official-stockfish/Stockfish/pull/6231 No functional change	2025-08-16 11:46:39 +02:00
Jost TrillerandJoost VandeVondele	7a07ac0e76	Adjust probcut on staticEval ... Reducing probcut depth more when staticEval is very good and less if staticEval is not so good compared to beta STC: https://tests.stockfishchess.org/tests/view/68926bf6690844f940fa1350 LLR: 2.98 (-2.94,2.94) <0.00,2.00> Total: 174400 W: 45698 L: 45174 D: 83528 Ptnml(0-2): 622, 20356, 44672, 20976, 574 LTC: https://tests.stockfishchess.org/tests/view/689651b4f8a258623dda6531 LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 56010 W: 14547 L: 14191 D: 27272 Ptnml(0-2): 31, 5929, 15738, 6267, 40 This patch was generated using qwen3-235b-a22b-thinking-2507: Prompt: https://rentry.co/bm6vriai Thinking: https://rentry.co/34km4zf8 Final respone: https://rentry.co/rauotrvr closes https://github.com/official-stockfish/Stockfish/pull/6219 Bench: 3629755	2025-08-09 09:08:38 +02:00
FauziAkramandJoost VandeVondele	ade8917447	Remove outdated comment ... Remove the Elo worth, as they are now completely outdated, making them irrelevant and potentially misleading Continuation of #5810 as these comments in "history.h" were missed. closes https://github.com/official-stockfish/Stockfish/pull/6216 No functional change	2025-08-09 09:04:33 +02:00
mstemberaandJoost VandeVondele	5464f7b114	Remove an instruction from find_nnz() ... closes https://github.com/official-stockfish/Stockfish/pull/6212 No functional change	2025-08-09 08:54:47 +02:00
Niklas FiekasandJoost VandeVondele	125a0cfe7b	Build x86-64-avx512icl in CI ... closes https://github.com/official-stockfish/Stockfish/pull/6217 No functional change	2025-08-09 08:51:45 +02:00
Stockfisher69andJoost VandeVondele	303fe9a164	Simplification: Futility pruning for captures ... tested in final form as simplication passed LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 113682 W: 29199 L: 29074 D: 55409 Ptnml(0-2): 68, 12359, 31859, 12490, 65 https://tests.stockfishchess.org/tests/view/688e85a17d68fe4f7f130e24 earlier test, equivalent: passed STC: LLR: 2.96 (-2.94,2.94) <0.00,2.00> Total: 120224 W: 31621 L: 31176 D: 57427 Ptnml(0-2): 415, 14167, 30567, 14484, 479 https://tests.stockfishchess.org/tests/view/68888bdd7b562f5f7b732643 closes https://github.com/official-stockfish/Stockfish/pull/6209 Bench: 2661621	2025-08-09 08:49:12 +02:00
KazAppsandJoost VandeVondele	b177b7394a	Separate bonus/malus parameters for quiet and capture moves ... Parameters were tuned on 60k STC games. Passed STC LLR: 2.95 (-2.94,2.94) <0.00,2.00> Total: 16928 W: 4570 L: 4277 D: 8081 Ptnml(0-2): 57, 1905, 4270, 2152, 80 https://tests.stockfishchess.org/tests/view/688b4486502b34dd5e711122 Passed LTC LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 43602 W: 11373 L: 11041 D: 21188 Ptnml(0-2): 23, 4657, 12116, 4975, 30 https://tests.stockfishchess.org/tests/view/688c0eb5502b34dd5e71124b Passed non-regression VLTC LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 181016 W: 46335 L: 46281 D: 88400 Ptnml(0-2): 33, 18177, 54034, 18231, 33 https://tests.stockfishchess.org/tests/view/688e0a77f17748b4d23c822b closes https://github.com/official-stockfish/Stockfish/pull/6200 bench: 3435529	2025-08-09 08:43:49 +02:00
rn5f107s2andJoost VandeVondele	94175524b1	Only set ep square if ep capture is possible ... for positions such as: position fen rr6/2q2p1k/2P1b1pp/bB2P1n1/R2B2PN/p4P1P/P1Q4K/1R6 b - - 2 38 moves f7f5 position fen 8/p2r1pK1/6p1/1kp1P1P1/2p5/2P5/8/4R3 b - - 0 43 moves f7f5 position fen 4k3/4p3/2b3b1/3P1P2/4K3/8/8/8 b - - moves e7e5 ep is not possible for various reasons. Do not set the ep square and the do not change the zobrist key, as if ep were possible. This fixes 3-fold detection, which could in rare cases be observed as a warning generated by fastchess for PVs that continued beyond an actual 3-fold. Also fixes wrong evals for certain moves e.g. a2a1 for position fen 4k3/1b2p2b/8/3P1P2/4K3/8/8/r7 b - - 0 1 moves e7e5 e4e3 a1a2 e3e4 a2a1 e4f3 a1a2 f3e4 fixes https://github.com/official-stockfish/Stockfish/issues/6138 originally written and tested by rn5f107s2, with small buglet as https://tests.stockfishchess.org/tests/view/685af90843ce022d15794400 failed STC LLR: -2.93 (-2.94,2.94) <-1.75,0.25> Total: 130688 W: 33986 L: 34362 D: 62340 Ptnml(0-2): 414, 13292, 38302, 12928, 408 https://tests.stockfishchess.org/tests/view/688bcb35502b34dd5e7111c9 passed LTC LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 99018 W: 25402 L: 25273 D: 48343 Ptnml(0-2): 54, 9097, 31089, 9204, 65 https://tests.stockfishchess.org/tests/view/688c613c502b34dd5e7112d3 https://github.com/official-stockfish/Stockfish/pull/6211 Bench: 2946135 Co-authored-by: Joost VandeVondele <Joost.VandeVondele@gmail.com>	2025-08-04 15:16:21 +02:00
Jost TrillerandJoost VandeVondele	377a3a5269	Depth dependent reduction threshold when full-depth re-search ... STC: https://tests.stockfishchess.org/tests/view/68894d577b562f5f7b73273b LLR: 2.98 (-2.94,2.94) <0.00,2.00> Total: 155072 W: 40651 L: 40150 D: 74271 Ptnml(0-2): 609, 18271, 39292, 18738, 626 LTC: https://tests.stockfishchess.org/tests/view/688c2705502b34dd5e71127a LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 321012 W: 82891 L: 81995 D: 156126 Ptnml(0-2): 227, 34421, 90285, 35375, 198 This commit was generated using qwen3-235b-a22b-thinking-2507: Prompt: https://rentry.co/iqtaoht7 Reasoning/thinking: https://rentry.co/wm6t9hye closes https://github.com/official-stockfish/Stockfish/pull/6210 Bench: 2983938	2025-08-04 15:12:55 +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
Michael ChalyandJoost VandeVondele	5d1505d8c7	Reintroduce reduction term in LMR for cutnodes ... This term increases reduction for cutnodes without tt move, term was simplified away recently. Passed STC: https://tests.stockfishchess.org/tests/view/688882007b562f5f7b73262f LLR: 2.95 (-2.94,2.94) <0.00,2.00> Total: 187616 W: 49367 L: 48824 D: 89425 Ptnml(0-2): 710, 21898, 48034, 22471, 695 Passed LTC: https://tests.stockfishchess.org/tests/view/688c71f4502b34dd5e71139a LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 140280 W: 36280 L: 35750 D: 68250 Ptnml(0-2): 79, 15175, 39121, 15667, 98 closes https://github.com/official-stockfish/Stockfish/pull/6206 Bench: 2996732	2025-08-04 14:58:59 +02:00
FauziAkramandJoost VandeVondele	8e733d68fd	Refactor: Simplify pawn structure indexing ... Refactoring the mechanism for calculating pawn structure hash indices and make it consistent with the rest. closes https://github.com/official-stockfish/Stockfish/pull/6205 No functional change	2025-08-04 14:56:03 +02:00
Joost VandeVondele	a6e34f128f	Fix icx profile-build ... fixes the issue pointed out in https://github.com/official-stockfish/Stockfish/pull/6202 closes https://github.com/official-stockfish/Stockfish/pull/6203 No functional change	2025-08-04 14:53:49 +02:00
FauziAkramandJoost VandeVondele	a37b38bdf0	Add "d < newDepth" condition for doDeeperSearch ... Add "d < newDepth" condition for doDeeperSearch Passed STC: LLR: 2.97 (-2.94,2.94) <0.00,2.00> Total: 66144 W: 17512 L: 17148 D: 31484 Ptnml(0-2): 220, 7726, 16833, 8056, 237 https://tests.stockfishchess.org/tests/view/6887cce67b562f5f7b731a79 Passed LTC: LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 411240 W: 106103 L: 105023 D: 200114 Ptnml(0-2): 256, 44249, 115566, 45257, 292 https://tests.stockfishchess.org/tests/view/6887ec527b562f5f7b731c37 closes https://github.com/official-stockfish/Stockfish/pull/6204 Bench: 2917036	2025-08-02 16:25:31 +02:00
FauziAkramandJoost VandeVondele	62b958f517	Remove code that is not used anywhere ... closes https://github.com/official-stockfish/Stockfish/pull/6201 No functional change	2025-08-02 16:21:41 +02:00
Daniel MonroeandJoost VandeVondele	cd52859bd5	Simplify improving term ... Set improving whenever ss->staticEval >= beta Passed simplification STC LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 38016 W: 10122 L: 9900 D: 17994 Ptnml(0-2): 143, 4388, 9747, 4564, 166 https://tests.stockfishchess.org/tests/view/688803917b562f5f7b7322eb Passed simplification LTC LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 21648 W: 5594 L: 5375 D: 10679 Ptnml(0-2): 12, 2241, 6096, 2466, 9 https://tests.stockfishchess.org/tests/view/688820397b562f5f7b73235d closes https://github.com/official-stockfish/Stockfish/pull/6198 Bench: 3576884	2025-08-02 16:18:46 +02:00
CSTENTORandJoost VandeVondele	57b32f3e60	Make Resetting the Aspiration Window after FailLow more aggressive ... Sets beta=(3alpha+beta)/4 when failLow. Before it was beta=(alpha+beta)/2, even though in theory we should be getting an upper bound from a failLow, we can’t trust the score that caused the failLow. Therefore beta=alpha doesn’t work. I made the buffer between the new beta to the bestValue that caused the failLow smaller. passed STC: https://tests.stockfishchess.org/tests/view/688674947b562f5f7b7315b5 LLR: 2.93 (-2.94,2.94) <0.00,2.00> Total: 119616 W: 31253 L: 30818 D: 57545 Ptnml(0-2): 313, 14028, 30724, 14397, 346 passed LTC: https://tests.stockfishchess.org/tests/view/6887e0ad7b562f5f7b731afc LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 96978 W: 24905 L: 24466 D: 47607 Ptnml(0-2): 59, 10376, 27183, 10809, 62 closes https://github.com/official-stockfish/Stockfish/pull/6197 bench: 3085519	2025-08-02 16:12:12 +02:00
aronpetkovskiandJoost VandeVondele	cef551092c	Only do IIR in minimally reduced nodes ... Passed STC LLR: 2.93 (-2.94,2.94) <0.00,2.00> Total: 164256 W: 42799 L: 42299 D: 79158 Ptnml(0-2): 451, 19305, 42087, 19863, 422 https://tests.stockfishchess.org/tests/view/68868e9b7b562f5f7b731615 Passed LTC LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 279396 W: 71871 L: 71062 D: 136463 Ptnml(0-2): 126, 30117, 78404, 30924, 127 https://tests.stockfishchess.org/tests/view/6886a4977b562f5f7b731663 closes https://github.com/official-stockfish/Stockfish/pull/6196 Bench: 3490609	2025-08-02 16:02:41 +02:00
J. OsterandJoost VandeVondele	9034730a5a	Display upper/lowerbound before wdl ... Bound info belongs directly to score info closes https://github.com/official-stockfish/Stockfish/pull/6195 No functional change.	2025-08-02 15:54:10 +02:00
MinetaSandJoost VandeVondele	32cb78d782	Increase CI timeouts for perft ... might fix CI failures on macOS instances closes https://github.com/official-stockfish/Stockfish/pull/6194 No functional change	2025-08-02 15:52:24 +02:00