Shawn Xu and Joost 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 Xu and Joost 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 Xu and Joost 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 Xu and Joost 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 Xu and Joost 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 Xu and Disservin
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 Xu and Disservin
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 Xu and Disservin
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 Xu and Disservin
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 Xu and Disservin
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 Xu and Joost 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 Xu and Joost 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 Xu and Joost 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 Xu and Joost 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 Xu and Disservin
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 Xu and Disservin
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 Xu and Disservin
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 Xu and Disservin
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 Xu and Disservin
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 Xu and Disservin
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 Xu and Disservin
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 Xu and Disservin
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 Xu and Disservin
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 Xu and Disservin
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
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 Xu and Disservin
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 Xu and Disservin
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 Xu and Joost 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 Xu and Disservin
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 Xu and Disservin
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 Xu and Disservin
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
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 Xu and Joost 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 Xu and Joost 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 Xu and Joost 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 Xu and Joost 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 Xu and Joost 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 Xu and Disservin
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 Xu and Disservin
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 Xu and Disservin
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 Xu and Disservin
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 Xu and Disservin
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 Xu and Disservin
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 Xu and Disservin
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 Xu and Disservin
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 Xu and Disservin
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 Xu and Disservin
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 Xu and Disservin
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 Xu and Disservin
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 Xu and Disservin
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 Xu and Disservin
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 Xu and Disservin
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 Xu and Disservin
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 Xu and Disservin
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 Xu and Disservin
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 Xu and Disservin
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 Xu and Disservin
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 Xu and Disservin
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 Xu and Disservin
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 Xu and Disservin
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 Xu and Joost 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 Xu and Disservin
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 Xu and Disservin
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 Xu and Disservin
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 Xu and Joost 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 Xu and Joost 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
Shawn Xu and Joost VandeVondele
175021721c
Simplify bestMove promotion
...
Passed Non-regression STC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 216768 W: 56240 L: 56217 D: 104311
Ptnml(0-2): 794, 24900, 56956, 24957, 777
https://tests.stockfishchess.org/tests/view/66bc11324ff211be9d4ee78b
Passed Non-regression LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 44970 W: 11391 L: 11199 D: 22380
Ptnml(0-2): 44, 4596, 13002, 4810, 33
https://tests.stockfishchess.org/tests/view/66bdbb1b4ff211be9d4eec5a
closes https://github.com/official-stockfish/Stockfish/pull/5535
bench: 1613043
2024-08-20 21:24:04 +02:00
Shawn Xu and Joost VandeVondele
a75717ede1
Simplify Post-LMR Continuation History Updates
...
Passed Non-regression STC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 55520 W: 14625 L: 14420 D: 26475
Ptnml(0-2): 247, 6522, 14007, 6747, 237
https://tests.stockfishchess.org/tests/view/66ad40874ff211be9d4ed8f7
Passed Non-regression LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 216168 W: 54561 L: 54540 D: 107067
Ptnml(0-2): 196, 24212, 59244, 24239, 193
https://tests.stockfishchess.org/tests/view/66aeac954ff211be9d4eda03
closes https://github.com/official-stockfish/Stockfish/pull/5530
bench 1418263
2024-08-20 20:51:39 +02:00
Shawn Xu and Joost VandeVondele
bc80ece6c7
Improve Comments for Pairwise Multiplication Optimization
...
closes https://github.com/official-stockfish/Stockfish/pull/5524
no functional change
2024-08-20 20:47:46 +02:00
Shawn Xu and Joost VandeVondele
ae9e55cf53
Simplify Cutnode Reduction
...
Passed Non-regression STC:
LR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 143968 W: 37439 L: 37333 D: 69196
Ptnml(0-2): 521, 17228, 36456, 17182, 597
https://tests.stockfishchess.org/tests/view/66a73f9f4ff211be9d4ed27f
Passed Non-regression LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 198954 W: 50384 L: 50345 D: 98225
Ptnml(0-2): 201, 22360, 54347, 22337, 232
https://tests.stockfishchess.org/tests/view/66a906e94ff211be9d4ed423
closes https://github.com/official-stockfish/Stockfish/pull/5526
bench 1277466
2024-08-03 09:42:54 +02:00
Shawn Xu and Disservin
2343f71f3f
Remove Killers
...
The removal of killers on line 1774 resulted in a substantial decrease
in pre-LMR history average, so a negative history fill is applied to
counter it.
Passed Non-regression STC (vs #5513 ):
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 21984 W: 5886 L: 5645 D: 10453
Ptnml(0-2): 80, 2492, 5628, 2691, 101
https://tests.stockfishchess.org/tests/view/66a095894ff211be9d4ecb9d
Passed Non-regression LTC (vs #5513 ):
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 95430 W: 24141 L: 23995 D: 47294
Ptnml(0-2): 97, 10537, 26298, 10689, 94
https://tests.stockfishchess.org/tests/view/66a11c8d4ff211be9d4ecbf8
closes https://github.com/official-stockfish/Stockfish/pull/5517
Bench: 1660869
2024-07-28 22:22:50 +02:00
Shawn Xu and Disservin
85893ac1cd
Simplify Away Killer Condition in Cutnode LMR
...
Passed Non-regression STC:
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 42944 W: 11240 L: 11024 D: 20680
Ptnml(0-2): 159, 5056, 10825, 5274, 158
https://tests.stockfishchess.org/tests/view/669c13384ff211be9d4ec69f
Passed Non-regression LTC:
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 163548 W: 41366 L: 41289 D: 80893
Ptnml(0-2): 109, 18246, 45007, 18283, 129
https://tests.stockfishchess.org/tests/view/669cb1254ff211be9d4ec73a
closes https://github.com/official-stockfish/Stockfish/pull/5513
Bench: 1178570
2024-07-28 22:13:47 +02:00
Shawn Xu and Joost VandeVondele
985b9fd7b0
Remove Killer Heuristic In Move Ordering
...
Passed Non-regression STC:
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 80480 W: 20979 L: 20802 D: 38699
Ptnml(0-2): 279, 9610, 20337, 9683, 331
https://tests.stockfishchess.org/tests/view/669c12c14ff211be9d4ec69b
Passed Non-regression LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 77988 W: 19788 L: 19624 D: 38576
Ptnml(0-2): 66, 8605, 21481, 8783, 59
https://tests.stockfishchess.org/tests/view/669d628a4ff211be9d4ec7a8
closes https://github.com/official-stockfish/Stockfish/pull/5511
bench 1367740
2024-07-23 19:24:00 +02:00
Shawn Xu and Joost VandeVondele
024eb6f453
Unify Movepick Initializer
...
Passed Non-regression STC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 168704 W: 43524 L: 43455 D: 81725
Ptnml(0-2): 414, 17173, 49076, 17308, 381
https://tests.stockfishchess.org/tests/view/66904b7b5034141ae599a197
Passed Non-regression LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 120294 W: 30473 L: 30364 D: 59457
Ptnml(0-2): 40, 10974, 38032, 11039, 62
https://tests.stockfishchess.org/tests/view/66905b235034141ae599a223
closes https://github.com/official-stockfish/Stockfish/pull/5477
bench 1459677
2024-07-15 13:18:37 +02:00
Shawn Xu and Joost VandeVondele
3df09c04d7
Simplify Away Refutation Stage
...
Simplify away killer stage to a constant bonus given to the killer move during
quiet move scoring.
Passed Non-regression STC (Against then-pending PR #5472 ):
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 106176 W: 27685 L: 27539 D: 50952
Ptnml(0-2): 410, 12765, 26637, 12821, 455
https://tests.stockfishchess.org/tests/view/668dd0835034141ae5999e8f
Passed Non-regression LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 92472 W: 23426 L: 23276 D: 45770
Ptnml(0-2): 55, 10376, 25215, 10544, 46
https://tests.stockfishchess.org/tests/view/669019e45034141ae5999fd2
closes https://github.com/official-stockfish/Stockfish/pull/5476
Bench 1459677
2024-07-15 13:15:35 +02:00
Shawn Xu and Joost VandeVondele
4880ed4ad1
Simplify Probcut Malus
...
Passed Non-regression STC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 74880 W: 19261 L: 19083 D: 36536
Ptnml(0-2): 202, 8861, 19120, 9071, 186
https://tests.stockfishchess.org/tests/view/668a0966eca84f4d25864cba
Passed Non-regression LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 263916 W: 66690 L: 66718 D: 130508
Ptnml(0-2): 125, 29348, 73040, 29320, 125
https://tests.stockfishchess.org/tests/view/668a17e3eca84f4d25864e91
closes https://github.com/official-stockfish/Stockfish/pull/5464
bench 1331408
2024-07-09 18:44:39 +02:00
Shawn Xu and Joost VandeVondele
2d3ef434b4
Tweak LMR at Root
...
Passed STC:
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 328192 W: 84751 L: 84014 D: 159427
Ptnml(0-2): 758, 38802, 84253, 39511, 772
https://tests.stockfishchess.org/tests/view/6689203959cb3228a4759a49
Passed LTC:
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 56748 W: 14494 L: 14136 D: 28118
Ptnml(0-2): 19, 6089, 15803, 6441, 22
https://tests.stockfishchess.org/tests/view/66892d76e59d990b103f6626
closes https://github.com/official-stockfish/Stockfish/pull/5452
Bench 1253593
2024-07-09 18:26:35 +02:00
Shawn Xu and Joost VandeVondele
b79ac764ff
Simplify in-check condition for Probcut-in-check
...
dont let your memes be dreams !?
Passed Non-regression STC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 512000 W: 132193 L: 132497 D: 247310
Ptnml(0-2): 1600, 61170, 130704, 60986, 1540
https://tests.stockfishchess.org/tests/view/66838911c4f539faa03268a2
Passed Non-regression LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 380268 W: 95894 L: 96042 D: 188332
Ptnml(0-2): 193, 42861, 104180, 42701, 199
https://tests.stockfishchess.org/tests/view/6688d0550c9d7c1ab33ed5a8
closes https://github.com/official-stockfish/Stockfish/pull/5443
Bench: 1130282
2024-07-09 18:24:40 +02:00
Shawn Xu and Joost VandeVondele
b1f522930d
Simplify Away Move Count Pruning Adjustment
...
Using Singular Search Result
Passed Non-regression STC:
LLR: 3.01 (-2.94,2.94) <-1.75,0.25>
Total: 62688 W: 16319 L: 16121 D: 30248
Ptnml(0-2): 196, 7317, 16104, 7547, 180
https://tests.stockfishchess.org/tests/view/66879bf51b527f04dd477ff9
Passed Non-regression LTC:
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 116502 W: 29504 L: 29379 D: 57619
Ptnml(0-2): 66, 12881, 32226, 13018, 60
https://tests.stockfishchess.org/tests/view/6688629e0c9d7c1ab33ed030
closes https://github.com/official-stockfish/Stockfish/pull/5442
bench 1207930
2024-07-09 18:20:26 +02:00
Shawn Xu and Joost VandeVondele
24ab46c511
Non-functional Fixes & Updates
...
Fixes a missing default slot for dbg_extremes of, removes a extra newline, and
updates SE elo estimate from
https://tests.stockfishchess.org/tests/view/664ebd1e928b1fb18de4e4b7 while we
are at it.
closes https://github.com/official-stockfish/Stockfish/pull/5446
No functional change
2024-07-06 17:56:31 +02:00
Shawn Xu and Joost VandeVondele
a45c2bc34a
Simplify Away Countermove Heuristic
...
Passed Non-regression STC:
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 977824 W: 252072 L: 252888 D: 472864
Ptnml(0-2): 2518, 117120, 250560, 116088, 2626
https://tests.stockfishchess.org/tests/view/6683452d95b0d1e881e81541
Passed Non-regression LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 81048 W: 20630 L: 20470 D: 39948
Ptnml(0-2): 36, 8915, 22464, 9071, 38
https://tests.stockfishchess.org/tests/view/66886b7b0c9d7c1ab33ed281
closes https://github.com/official-stockfish/Stockfish/pull/5441
bench 1276784
2024-07-06 17:48:11 +02:00
Shawn Xu and Joost VandeVondele
b9ff5bb93b
Implement dbg_extremes_of
...
An alternative to #5431 , implements one function `dbg_extremes_of` to keep track
of min and max.
closes https://github.com/official-stockfish/Stockfish/pull/5434
No functional change
2024-07-03 13:44:01 +02:00
Shawn Xu and Joost VandeVondele
69ad4667fb
Do Capture History Updates In Probcut
...
This patch introduces history updates to probcut. Standard depth - 3 bonus and
maluses are given to the capture that caused fail high and previously searched
captures, respectively. Similar to #5243 , a negative history fill is applied to
compensate for an increase in capture history average, thus improving the
scaling of this patch.
Passed STC:
LLR: 2.95 (-2.94,2.94) <0.00,2.00>
Total: 84832 W: 21941 L: 21556 D: 41335
Ptnml(0-2): 226, 9927, 21688, 10386, 189
https://tests.stockfishchess.org/tests/view/6682fab9389b9ee542b1d029
Passed LTC:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 104298 W: 26469 L: 26011 D: 51818
Ptnml(0-2): 43, 11458, 28677, 11940, 31
https://tests.stockfishchess.org/tests/view/6682ff06389b9ee542b1d0a0
closes https://github.com/official-stockfish/Stockfish/pull/5428
bench 1281351
2024-07-03 13:18:00 +02:00
Shawn Xu and Joost VandeVondele
d5c130569b
Simplify Bonus Formula In History Adjustment
...
Inspired by a discord message [1] from Vizvezdenec, this patch simplifies the
bonus adjustment bonus = bonus > 0 ? 2 * bonus : bonus / 2 to a constant
addition, maintaining bonus average at around 0 in regular bench. As cj5716
pointed in discord [2], the constant bonus can also be considered as factoring
tempo when calculating bonus, yielding a better value of the move.
[1] https://discord.com/channels/435943710472011776/882956631514689597/1243877089443188776
[2] https://discord.com/channels/435943710472011776/813919248455827515/1252277437249622077
Passed Non-regression STC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 29984 W: 7908 L: 7677 D: 14399
Ptnml(0-2): 95, 3502, 7594, 3679, 122
https://tests.stockfishchess.org/tests/view/666f7210602682471b064fa2
Passed Non-regression LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 170136 W: 43214 L: 43145 D: 83777
Ptnml(0-2): 158, 19185, 46311, 19258, 156
https://tests.stockfishchess.org/tests/view/666fb32e602682471b064fb5
closes https://github.com/official-stockfish/Stockfish/pull/5401
bench 1438375
2024-06-23 11:41:48 +02:00
Shawn Xu and Joost VandeVondele
4a2291ed33
Simplify Away Quadruple Extension
...
Passed non-regression VVLTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 90792 W: 23155 L: 23018 D: 44619
Ptnml(0-2): 6, 8406, 28432, 8549, 3
https://tests.stockfishchess.org/tests/view/664ffa4ca86388d5e27d8e7a
Passed non-regression VLTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 288136 W: 72608 L: 72659 D: 142869
Ptnml(0-2): 38, 30258, 83525, 30211, 36
https://tests.stockfishchess.org/tests/view/66551609a86388d5e27db9ae
closes https://github.com/official-stockfish/Stockfish/pull/5293
bench 1501735
2024-05-30 14:16:17 +02:00
Shawn Xu and Disservin
ae7eef51fd
Simplify Fail Low Bonus Formula
...
Tested against PR #5299
Passed Non-regression STC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 76352 W: 19797 L: 19619 D: 36936
Ptnml(0-2): 236, 9017, 19509, 9161, 253
https://tests.stockfishchess.org/tests/view/66564f60a86388d5e27dd307
Passed Non-regression LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 114624 W: 28946 L: 28821 D: 56857
Ptnml(0-2): 59, 12675, 31714, 12810, 54
https://tests.stockfishchess.org/tests/view/6656543da86388d5e27dd329
closes https://github.com/official-stockfish/Stockfish/pull/5301
Bench: 1212167
2024-05-29 19:01:50 +02:00
Shawn Xu and Disservin
c39b98b9e3
Simplify Away History Updates in Multicut
...
Passed Non-regression STC:
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 44896 W: 11600 L: 11388 D: 21908
Ptnml(0-2): 140, 5230, 11532, 5370, 176
https://tests.stockfishchess.org/tests/view/664cee31830eb9f886616a80
Passed Non-regression LTC:
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 56832 W: 14421 L: 14234 D: 28177
Ptnml(0-2): 37, 6251, 15643, 6458, 27
https://tests.stockfishchess.org/tests/view/664cfd4e830eb9f886616aa6
closes https://github.com/official-stockfish/Stockfish/pull/5281
Bench: 1119412
2024-05-23 21:30:33 +02:00
Shawn Xu and Joost VandeVondele
f27a9be29c
Reduce When TTValue is Above Alpha
...
Passed STC:
LLR: 2.95 (-2.94,2.94) <0.00,2.00>
Total: 53376 W: 13818 L: 13476 D: 26082
Ptnml(0-2): 156, 6212, 13626, 6522, 172
https://tests.stockfishchess.org/tests/view/664aa261830eb9f8866145e5
Passed LTC:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 393444 W: 100096 L: 99042 D: 194306
Ptnml(0-2): 191, 43516, 108248, 44582, 185
https://tests.stockfishchess.org/tests/view/664ab54f830eb9f88661463c
closes https://github.com/official-stockfish/Stockfish/pull/5276
Bench: 1024562
2024-05-21 08:40:37 +02:00
Shawn Xu and Joost VandeVondele
4edd1a389e
Simplify Away Quadruple Extensions
...
serendipitous gainer
Passed LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 95472 W: 24176 L: 24031 D: 47265
Ptnml(0-2): 52, 10533, 26414, 10692, 45
https://tests.stockfishchess.org/tests/live_elo/6647fa596dcff0d1d6b05efa
Passed VVLTC 70+7 th 7:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 6772 W: 1793 L: 1583 D: 3396
Ptnml(0-2): 0, 502, 2172, 712, 0
https://tests.stockfishchess.org/tests/live_elo/6648277a6dcff0d1d6b05ffb
Passed VVLTC 70+7 th 7 (2x):
https://tests.stockfishchess.org/tests/view/66484c896dcff0d1d6b0619d
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 5424 W: 1469 L: 1254 D: 2701
Ptnml(0-2): 0, 394, 1710, 607, 1
closes https://github.com/official-stockfish/Stockfish/pull/5259
Bench: 1441794
2024-05-18 09:32:21 +02:00
Shawn Xu and Joost VandeVondele
285f1d2a66
Tweak NMP Formula
...
Passed STC:
LLR: 2.99 (-2.94,2.94) <0.00,2.00>
Total: 241728 W: 62440 L: 61811 D: 117477
Ptnml(0-2): 914, 28467, 61458, 29126, 899
https://tests.stockfishchess.org/tests/live_elo/6645992993ce6da3e93b5b99
Passed LTC:
LLR: 2.96 (-2.94,2.94) <0.50,2.50>
Total: 167850 W: 42620 L: 42030 D: 83200
Ptnml(0-2): 82, 18412, 46354, 18988, 89
https://tests.stockfishchess.org/tests/live_elo/6647c5726dcff0d1d6b05dd3
closes https://github.com/official-stockfish/Stockfish/pull/5257
Bench: 1636018
2024-05-18 09:26:42 +02:00
Shawn Xu and Joost VandeVondele
540545d127
simplify away quietCheckEvasions pruning
...
simplifies away the pruning of quiet evasion moves in quiescent search.
Passed STC:
LLR: 2.98 (-2.94,2.94) <-1.75,0.25>
Total: 343520 W: 88356 L: 88470 D: 166694
Ptnml(0-2): 1061, 40073, 89706, 39759, 1161
https://tests.stockfishchess.org/tests/view/663c7ddfc0b75d7f7b980f3b
Passed LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 168744 W: 42454 L: 42384 D: 83906
Ptnml(0-2): 75, 18678, 46782, 18776, 61
https://tests.stockfishchess.org/tests/view/663ce34fc0b75d7f7b981ed9
closes https://github.com/official-stockfish/Stockfish/pull/5231
bench 3681552
2024-05-13 07:16:59 +02:00
Shawn Xu and Joost VandeVondele
c43425b0b1
Simplify Away Negative Extension
...
This patch simplifies away the negative extension applied when the value returned by the transposition table is assumed to fail low over the value of reduced search.
Passed STC:
LLR: 2.99 (-2.94,2.94) <-1.75,0.25>
Total: 248736 W: 64293 L: 64302 D: 120141
Ptnml(0-2): 925, 29833, 62831, 29884, 895
https://tests.stockfishchess.org/tests/view/663bee3bca93dad645f7f64a
Passed LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 254970 W: 64289 L: 64308 D: 126373
Ptnml(0-2): 110, 28428, 70422, 28421, 104
https://tests.stockfishchess.org/tests/view/663c11f0c0b75d7f7b97d4bb
closes https://github.com/official-stockfish/Stockfish/pull/5226
Bench: 2353057
2024-05-09 09:02:57 +02:00
Shawn Xu and Joost VandeVondele
e13e4cfb83
Simplify NMP Condition
...
Remove eval >= ss->staticEval condition for Null Move Pruning.
Passed non-regression STC:
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 44000 W: 11420 L: 11202 D: 21378
Ptnml(0-2): 174, 5243, 10978, 5401, 204
https://tests.stockfishchess.org/tests/live_elo/6603ee490ec64f0526c57984
Passed non-regression LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 82956 W: 20978 L: 20818 D: 41160
Ptnml(0-2): 54, 9353, 22499, 9523, 49
https://tests.stockfishchess.org/tests/live_elo/660464b50ec64f0526c5804d
closes https://github.com/official-stockfish/Stockfish/pull/5142
Bench 1759189
2024-03-29 10:18:40 +01:00
