Daniel Monroe and Joost VandeVondele
91c6ea82aa
Simplify malus formula
...
Passed non-regression STC
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 51936 W: 13490 L: 13283 D: 25163
Ptnml(0-2): 161, 6128, 13184, 6333, 162
https://tests.stockfishchess.org/tests/view/698120e06362aee5c8a55412
Passed non-regression LTC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 233772 W: 59502 L: 59499 D: 114771
Ptnml(0-2): 144, 25753, 65086, 25762, 141
https://tests.stockfishchess.org/tests/view/69827426889c3a4c31c8db52
closes https://github.com/official-stockfish/Stockfish/pull/6606
bench 2739355
2026-02-13 07:15:35 +01:00
Daniel Monroe and Joost VandeVondele
89b4f457e0
Simplify malus decay formula
...
Passed non-regression STC
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 93600 W: 24165 L: 24007 D: 45428
Ptnml(0-2): 325, 11021, 23958, 11163, 333
https://tests.stockfishchess.org/tests/view/698121d46362aee5c8a55414
Passed non-regression LTC
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 83232 W: 21236 L: 21077 D: 40919
Ptnml(0-2): 46, 9147, 23083, 9282, 58
https://tests.stockfishchess.org/tests/view/698336dc473df9d1d24a90e8
closes https://github.com/official-stockfish/Stockfish/pull/6600
Bench: 2666284
2026-02-13 07:12:04 +01:00
Daniel Monroe and Disservin
21b0974f8d
Simplify away main history default
...
Passed non-regression STC
LLR: 2.97 (-2.94,2.94) <-1.75,0.25>
Total: 130752 W: 33725 L: 33605 D: 63422
Ptnml(0-2): 421, 15472, 33460, 15612, 411
https://tests.stockfishchess.org/tests/view/697eb9e35f56030af97b5a9e
Passed non-regression LTC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 53352 W: 13697 L: 13509 D: 26146
Ptnml(0-2): 36, 5804, 14811, 5986, 39
https://tests.stockfishchess.org/tests/view/6980e5846362aee5c8a55396
closes https://github.com/official-stockfish/Stockfish/pull/6590
Bench: 2375860
2026-02-08 15:22:29 +01:00
Daniel Monroe and Disservin
1047f844d1
Simplify doDeeperSearch
...
Passed simplification STC
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 92096 W: 23888 L: 23728 D: 44480
Ptnml(0-2): 336, 10796, 23608, 10988, 320
https://tests.stockfishchess.org/tests/view/694b6b9d572093c1986d6ae0
Passed simplification LTC
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 50064 W: 12789 L: 12598 D: 24677
Ptnml(0-2): 24, 5350, 14103, 5521, 34
https://tests.stockfishchess.org/tests/view/694d49aa572093c1986d7021
closes https://github.com/official-stockfish/Stockfish/pull/6493
Bench: 2494221
2025-12-28 14:53:12 +01:00
Daniel Monroe and Disservin
b4b01d0ca2
Remove rootDepth condition in newDepth clamping
...
Passed simplification STC
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 132256 W: 34462 L: 34347 D: 63447
Ptnml(0-2): 470, 15625, 33833, 15720, 480
https://tests.stockfishchess.org/tests/view/69325fe0a24a6df719fcca16
Passed simplification LTC
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 128220 W: 32503 L: 32392 D: 63325
Ptnml(0-2): 94, 13900, 35982, 14069, 65
https://tests.stockfishchess.org/tests/view/6934c2b3a24a6df719fcdf1e
closes https://github.com/official-stockfish/Stockfish/pull/6472
Bench: 2926903
2025-12-21 15:43:32 +01:00
Daniel Monroe and Disservin
8449e5eb9d
Remove non-functional term in isShuffling
...
closes https://github.com/official-stockfish/Stockfish/pull/6462
No functional change
2025-12-21 15:43:32 +01:00
Daniel Monroe and Joost VandeVondele
5297ba0a1a
Move hindsight reductions above cutoffs
...
Passed STC
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 52640 W: 13701 L: 13361 D: 25578
Ptnml(0-2): 168, 6143, 13356, 6487, 166
https://tests.stockfishchess.org/tests/view/6918dc407ca8781852332339
Passed LTC
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 207690 W: 53187 L: 52520 D: 101983
Ptnml(0-2): 93, 22515, 57994, 23118, 125
https://tests.stockfishchess.org/tests/view/6919dd307ca87818523324c7
closes https://github.com/official-stockfish/Stockfish/pull/6448
Bench: 2912398
2025-12-01 17:35:34 +01:00
Daniel Monroe and Joost VandeVondele
d9fd516547
Post-NNUEv10 tune
...
Tune search parameters after the switch to NNUEv10.
The change is neutral at STC but increases with the TC. The main changes are more aggressive corrections, futility pruning, and extensions.
Failed STC
LLR: -2.96 (-2.94,2.94) <0.00,2.00>
Total: 108320 W: 27616 L: 27719 D: 52985
Ptnml(0-2): 332, 12833, 27884, 12828, 283
https://tests.stockfishchess.org/tests/view/69212e623b03dd3a060e6114
Passed LTC
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 43272 W: 11117 L: 10788 D: 21367
Ptnml(0-2): 20, 4543, 12180, 4874, 19
https://tests.stockfishchess.org/tests/view/692130813b03dd3a060e6123
Passed VLTC
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 22714 W: 5840 L: 5581 D: 11293
Ptnml(0-2): 2, 2152, 6795, 2401, 7
https://tests.stockfishchess.org/tests/view/6921387b3b03dd3a060e6191
Passed VLTC SMP
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 11868 W: 3142 L: 2896 D: 5830
Ptnml(0-2): 0, 1007, 3676, 1249, 2
https://tests.stockfishchess.org/tests/view/69212e953b03dd3a060e611b
closes https://github.com/official-stockfish/Stockfish/pull/6444
bench 2907929
2025-11-22 07:56:47 +01:00
Daniel Monroe and Joost VandeVondele
a191791f46
Clean up code and comments
...
closes https://github.com/official-stockfish/Stockfish/pull/6416
No functional change
2025-11-14 17:30:55 +01:00
Daniel Monroe and Joost VandeVondele
9e38023a8c
Simplify threat term in movepick
...
Passed simplification STC
LLR: 2.97 (-2.94,2.94) <-1.75,0.25>
Total: 71296 W: 18605 L: 18419 D: 34272
Ptnml(0-2): 250, 8374, 18183, 8622, 219
https://tests.stockfishchess.org/tests/view/690454c7ea4b268f1fac1bbe
Passed simplification LTC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 240552 W: 61870 L: 61874 D: 116808
Ptnml(0-2): 113, 26300, 67460, 26284, 119
https://tests.stockfishchess.org/tests/view/69063956ea4b268f1fac1f66
closes https://github.com/official-stockfish/Stockfish/pull/6401
bench 2697501
2025-11-13 22:35:33 +01:00
Daniel Monroe and Joost VandeVondele
8551f86efc
Remove check term in capture movepick
...
Passed simplification STC
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 248448 W: 64697 L: 64708 D: 119043
Ptnml(0-2): 784, 29393, 63971, 29202, 874
https://tests.stockfishchess.org/tests/view/68fc7afb637acd2a11e72d86
Passed simplification LTC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 193626 W: 49808 L: 49764 D: 94054
Ptnml(0-2): 162, 21415, 53621, 21447, 168
https://tests.stockfishchess.org/tests/view/6901ad09637acd2a11e73828
closes https://github.com/official-stockfish/Stockfish/pull/6395
bench 2920273
2025-11-13 22:31:02 +01:00
Daniel Monroe and Joost VandeVondele
7ac8e62219
Refine constant in correction history update
...
Passed STC
LLR: 3.04 (-2.94,2.94) <0.00,2.00>
Total: 250112 W: 65277 L: 64635 D: 120200
Ptnml(0-2): 841, 29326, 64134, 29860, 895
https://tests.stockfishchess.org/tests/view/69096c46ea4b268f1fac2a39
Passed LTC
LLR: 2.96 (-2.94,2.94) <0.50,2.50>
Total: 142908 W: 37141 L: 36604 D: 69163
Ptnml(0-2): 100, 15478, 39742, 16053, 81
https://tests.stockfishchess.org/tests/view/690e7dfbec1d00d2c195c351
closes https://github.com/official-stockfish/Stockfish/pull/6405
bench 2613869
2025-11-13 22:10:30 +01:00
Daniel Monroe and Joost VandeVondele
c9a2aff485
Simplify correction update condition
...
Passed non-regression STC
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 95136 W: 24722 L: 24564 D: 45850
Ptnml(0-2): 307, 11139, 24522, 11289, 311
https://tests.stockfishchess.org/tests/view/68e5034ea017f472e763dc5a
Passed non-regression LTC
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 256440 W: 65854 L: 65873 D: 124713
Ptnml(0-2): 144, 28287, 71375, 28272, 142
https://tests.stockfishchess.org/tests/view/68e71ae4a017f472e763e291
closes https://github.com/official-stockfish/Stockfish/pull/6375
bench 2216361
2025-11-01 11:29:47 +01:00
Daniel Monroe and Joost VandeVondele
013d42914f
Simplify static eval bonus
...
Passed non-regression STC
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 176896 W: 45998 L: 45933 D: 84965
Ptnml(0-2): 609, 20845, 45451, 20958, 585
https://tests.stockfishchess.org/tests/view/68e5e48ba017f472e763dd21
Passed non-regression LTC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 77682 W: 20046 L: 19884 D: 37752
Ptnml(0-2): 41, 8404, 21786, 8572, 38
https://tests.stockfishchess.org/tests/view/68ee71e328e6d77fcff9fd68
closes https://github.com/official-stockfish/Stockfish/pull/6374
bench 2101654
2025-11-01 11:27:27 +01:00
Daniel Monroe and Joost VandeVondele
fd3c563f57
Simplify r50 condition in cutoff
...
Passed non-regression STC
LLR: 3.11 (-2.94,2.94) <-1.75,0.25>
Total: 114560 W: 29832 L: 29689 D: 55039
Ptnml(0-2): 332, 12302, 31869, 12445, 332
https://tests.stockfishchess.org/tests/view/68e38587fa806e2e8393d4a9
Passed non-regression LTC
LLR: 2.99 (-2.94,2.94) <-1.75,0.25>
Total: 256272 W: 65817 L: 65832 D: 124623
Ptnml(0-2): 137, 25528, 76817, 25521, 133
https://tests.stockfishchess.org/tests/view/68e69b47a017f472e763e065
closes https://github.com/official-stockfish/Stockfish/pull/6373
Bench: 2438327
2025-11-01 11:20:23 +01:00
Daniel Monroe and Joost VandeVondele
9e071f3561
Simplify best move effort
...
Passed non-regression STC
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 44224 W: 11614 L: 11403 D: 21207
Ptnml(0-2): 147, 4936, 11726, 5165, 138
https://tests.stockfishchess.org/tests/view/68e9410ed323fd15c04e3a87
Passed non-regression LTC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 109788 W: 28223 L: 28096 D: 53469
Ptnml(0-2): 60, 11493, 31657, 11628, 56
https://tests.stockfishchess.org/tests/view/68eb5ac0a23744016c14af1d
closes https://github.com/official-stockfish/Stockfish/pull/6371
No functional change
2025-11-01 11:18:00 +01:00
Daniel Monroe and Joost VandeVondele
e7a4708ad5
Remove condition in qsearch
...
Instead of skipping non-captures when pawn history is exceptionally high, skip all non-captures
Passed non-regression STC
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 38016 W: 10018 L: 9795 D: 18203
Ptnml(0-2): 155, 4346, 9755, 4625, 127
https://tests.stockfishchess.org/tests/view/68e43d4aa017f472e763db2e
Passed rebased non-regression LTC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 96048 W: 24854 L: 24710 D: 46484
Ptnml(0-2): 47, 10504, 26780, 10644, 49
https://tests.stockfishchess.org/tests/view/68e59352a017f472e763dcf9
closes https://github.com/official-stockfish/Stockfish/pull/6355
bench 2343840
2025-10-14 17:32:32 +02:00
Daniel Monroe and Joost VandeVondele
feb17e5acf
Make sure we don't move a nonexistent piece in SEE
...
added assert.
closes https://github.com/official-stockfish/Stockfish/pull/6342
No functional change
2025-10-07 11:49:00 +02:00
Daniel Monroe and Joost VandeVondele
da63060ea3
Simplify sign term in quiet histories
...
Simplify sign term in quiet histories
Passed simplification STC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 497824 W: 129130 L: 129418 D: 239276
Ptnml(0-2): 1546, 59040, 128008, 58792, 1526
https://tests.stockfishchess.org/tests/view/68a2a9c1b6fb3300203bc3ed
Passed simplification LTC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 70830 W: 18185 L: 18016 D: 34629
Ptnml(0-2): 36, 7658, 19861, 7821, 39
https://tests.stockfishchess.org/tests/view/68af36c96217b8721dca98d9
closes https://github.com/official-stockfish/Stockfish/pull/6282
Bench: 2393762
2025-09-02 20:37:04 +02:00
Daniel Monroe and Joost 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 Monroe and Joost 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
Daniel Monroe and Joost 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 Monroe and Joost 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
Daniel Monroe and Joost 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
Daniel Monroe and Joost VandeVondele
525a5749bc
Simplify extra continuation history updates
...
Passed simplification STC
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 254464 W: 65774 L: 65793 D: 122897
Ptnml(0-2): 699, 30087, 65638, 30150, 658
https://tests.stockfishchess.org/tests/view/68863283966ed85face24a59
Passed simplification LTC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 144750 W: 37111 L: 37018 D: 70621
Ptnml(0-2): 79, 15676, 40764, 15785, 71
https://tests.stockfishchess.org/tests/view/6886655f7b562f5f7b731359
closes https://github.com/official-stockfish/Stockfish/pull/6189
Bench: 3071078
2025-07-28 20:13:15 +02:00
Daniel Monroe and Joost VandeVondele
92514fd3a2
Simplify away a term in see pruning
...
This change only sets the margin to 0 when depth <= 2 and margin <= 42 which
never has a difference, thus non-functional
Passed non-regression STC
LLR: 3.51 (-2.94,2.94) <-1.75,0.25>
Total: 306976 W: 78935 L: 78961 D: 149080
Ptnml(0-2): 630, 34097, 84067, 34057, 637
https://tests.stockfishchess.org/tests/view/68708015fa93cf16d3bb2782
closes https://github.com/official-stockfish/Stockfish/pull/6170
No functional change
2025-07-24 10:32:41 +02:00
Daniel Monroe and Joost VandeVondele
c13f883dc4
simplify away TT history term
...
Passed simplification STC
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 163168 W: 42136 L: 42055 D: 78977
Ptnml(0-2): 410, 19224, 42212, 19351, 387
https://tests.stockfishchess.org/tests/view/684e16ee703522d4f129c9e9
Passed simplification LTC
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 303144 W: 77580 L: 77647 D: 147917
Ptnml(0-2): 150, 33110, 85134, 33013, 165
https://tests.stockfishchess.org/tests/view/6852ff97703522d4f129d5f7
closes https://github.com/official-stockfish/Stockfish/pull/6152
bench: 2294774
2025-07-24 09:59:00 +02:00
Daniel Monroe and Joost VandeVondele
a43f12ef08
Simplify away constants in statscore
...
Passed simplification STC
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 317280 W: 81589 L: 81678 D: 154013
Ptnml(0-2): 799, 37651, 81847, 37526, 817
https://tests.stockfishchess.org/tests/view/684e197a703522d4f129c9f0
Passed simplification LTC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 174816 W: 44656 L: 44593 D: 85567
Ptnml(0-2): 83, 19064, 49058, 19113, 90
https://tests.stockfishchess.org/tests/view/6858aa54a596a06817bb924f
closes https://github.com/official-stockfish/Stockfish/pull/6150
bench: 2508140
2025-07-24 09:56:36 +02:00
Daniel Monroe and Joost VandeVondele
62f08568cd
Simplify PV term in lmr
...
Passed simplification STC
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 204000 W: 52541 L: 52506 D: 98953
Ptnml(0-2): 561, 24133, 52589, 24144, 573
https://tests.stockfishchess.org/tests/view/684f24ce703522d4f129cab5
Passed simplification LTC
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 156150 W: 39890 L: 39807 D: 76453
Ptnml(0-2): 82, 16882, 44043, 17007, 61
https://tests.stockfishchess.org/tests/view/6855d8bf1d0d9fc6587538f8
closes https://github.com/official-stockfish/Stockfish/pull/6148
bench 2766493
2025-07-24 09:49:43 +02:00
Daniel Monroe and Disservin
3a0fff96cf
Simplify quiet move streak logic
...
Passed non-regression STC
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 148960 W: 38409 L: 38312 D: 72239
Ptnml(0-2): 372, 17664, 38318, 17747, 379
https://tests.stockfishchess.org/tests/view/684c5773703522d4f129c5f7
Passed non-regression LTC
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 180720 W: 46188 L: 46130 D: 88402
Ptnml(0-2): 84, 19608, 50929, 19644, 95
https://tests.stockfishchess.org/tests/view/68505fa5703522d4f129cbab
closes https://github.com/official-stockfish/Stockfish/pull/6143
Bench: 2055894
2025-07-02 18:31:04 +02:00
Daniel Monroe and Disservin
a7a56c41f6
Simplify history term in futility pruning
...
Passed simplification STC
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 298816 W: 76814 L: 76881 D: 145121
Ptnml(0-2): 726, 35477, 77057, 35434, 714
https://tests.stockfishchess.org/tests/view/683f440f6ec7634154f9dc7f
Passed simplification LTC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 237774 W: 60801 L: 60802 D: 116171
Ptnml(0-2): 91, 26088, 66532, 26083, 93
https://tests.stockfishchess.org/tests/view/68441189ffbc71bd236778de
closes https://github.com/official-stockfish/Stockfish/pull/6130
Bench: 2411502
2025-07-02 18:31:04 +02:00
Daniel Monroe and Joost VandeVondele
9ac756695e
reduce depth by 5 in probcut
...
Passed simplification STC
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 63328 W: 16402 L: 16213 D: 30713
Ptnml(0-2): 174, 7378, 16340, 7629, 143
https://tests.stockfishchess.org/tests/view/6833530e6ec7634154f9be7f
Passed simplification LTC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 69936 W: 17795 L: 17625 D: 34516
Ptnml(0-2): 29, 7631, 19474, 7809, 25
https://tests.stockfishchess.org/tests/view/68335e386ec7634154f9c266
closes https://github.com/official-stockfish/Stockfish/pull/6120
Bench: 2307268
2025-06-02 22:09:11 +02:00
Daniel Monroe and Joost VandeVondele
254b6d5e85
Simplify corrections in extension margins
...
Passed simplification STC
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 96192 W: 25002 L: 24852 D: 46338
Ptnml(0-2): 242, 10868, 25716, 11038, 232
https://tests.stockfishchess.org/tests/view/683b44cb6ec7634154f9d6ac
Passed simplification LTC
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 83334 W: 21473 L: 21317 D: 40544
Ptnml(0-2): 37, 8877, 23674, 9051, 28
https://tests.stockfishchess.org/tests/view/683b79786ec7634154f9d75a
closes https://github.com/official-stockfish/Stockfish/pull/6117
Bench: 2294814
2025-06-02 22:05:11 +02:00
Daniel Monroe and Joost VandeVondele
3747a19937
Simplify away depth condition in IIR
...
Passed simplification STC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 359520 W: 92714 L: 92849 D: 173957
Ptnml(0-2): 977, 42640, 92614, 42599, 930
https://tests.stockfishchess.org/tests/view/6833705d6ec7634154f9c302
Passed simplification LTC
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 201756 W: 51544 L: 51507 D: 98705
Ptnml(0-2): 89, 21965, 56728, 22012, 84
https://tests.stockfishchess.org/tests/view/68338e386ec7634154f9c790
Passed simplification VLTC
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 48558 W: 12675 L: 12492 D: 23391
Ptnml(0-2): 9, 4779, 14516, 4970, 5
https://tests.stockfishchess.org/tests/view/6838e0b26ec7634154f9d25b
closes https://github.com/official-stockfish/Stockfish/pull/6112
Bench: 2302583
2025-06-02 21:52:38 +02:00
Daniel Monroe and Joost VandeVondele
70ff5e3163
Simplify away cutoff term in prior countermove bonus
...
Passed simplification STC
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 61120 W: 16010 L: 15819 D: 29291
Ptnml(0-2): 150, 7105, 15869, 7276, 160
https://tests.stockfishchess.org/tests/view/683560226ec7634154f9ce0f
Passed simplification LTC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 225090 W: 57555 L: 57543 D: 109992
Ptnml(0-2): 104, 24367, 63603, 24355, 116
https://tests.stockfishchess.org/tests/view/6836420c6ec7634154f9cf5c
closes https://github.com/official-stockfish/Stockfish/pull/6111
Bench: 2472910
2025-06-02 21:49:43 +02:00
Daniel Monroe and Joost VandeVondele
ddefd6eb6b
Simplify away check term in statscore
...
Passed simplification STC
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 61696 W: 16031 L: 15841 D: 29824
Ptnml(0-2): 151, 7160, 16046, 7330, 161
https://tests.stockfishchess.org/tests/view/68353fcc6ec7634154f9cdd5
Passed simplification LTC
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 237990 W: 60994 L: 60995 D: 116001
Ptnml(0-2): 95, 25964, 66903, 25913, 120
https://tests.stockfishchess.org/tests/view/683642256ec7634154f9cf5e
closes https://github.com/official-stockfish/Stockfish/pull/6110
Bench: 2521003
2025-06-02 21:47:26 +02:00
Daniel Monroe and Joost VandeVondele
9fd40b9ea8
Simplify tt depth in stat eval history adjustment
...
Passed simplification STC
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 102208 W: 26498 L: 26349 D: 49361
Ptnml(0-2): 284, 12095, 26166, 12306, 253
https://tests.stockfishchess.org/tests/view/683354c76ec7634154f9be88
Passed simplification LTC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 133422 W: 34050 L: 33945 D: 65427
Ptnml(0-2): 56, 14473, 37559, 14556, 67
https://tests.stockfishchess.org/tests/view/683363626ec7634154f9c298
closes https://github.com/official-stockfish/Stockfish/pull/6099
Bench: 2652411
2025-06-02 21:19:17 +02:00
Daniel Monroe and Joost VandeVondele
dfa176fc7e
Small tt verify simplification
...
Also fix probcut comment
Passed non-regression STC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 69728 W: 18080 L: 17909 D: 33739
Ptnml(0-2): 161, 7157, 20044, 7354, 148
https://tests.stockfishchess.org/tests/view/68324b116ec7634154f9b478
closes https://github.com/official-stockfish/Stockfish/pull/6094
No functional change
2025-06-02 21:15:56 +02:00
Daniel Monroe and Joost VandeVondele
4f021cab3b
Simplify allNode term in prior countermove
...
Passed simplification STC
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 53632 W: 14008 L: 13805 D: 25819
Ptnml(0-2): 136, 6253, 13869, 6388, 170
https://tests.stockfishchess.org/tests/view/6828f2b26ec7634154f99b5e
Passed simplification LTC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 82482 W: 21202 L: 21045 D: 40235
Ptnml(0-2): 37, 8986, 23052, 9115, 51
https://tests.stockfishchess.org/tests/view/6829010a6ec7634154f99db3
closes https://github.com/official-stockfish/Stockfish/pull/6068
Bench: 2302782
2025-05-23 08:51:54 +02:00
Daniel Monroe and Joost VandeVondele
6e9b5af0f0
Check evaluation after ttMove before doing a tt cut
...
Passed STC
LLR: 2.97 (-2.94,2.94) <0.00,2.00>
Total: 239136 W: 62222 L: 61608 D: 115306
Ptnml(0-2): 675, 28046, 61525, 28634, 688
https://tests.stockfishchess.org/tests/view/681053293629b02d74b1668f
Passed LTC
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 448770 W: 115237 L: 114088 D: 219445
Ptnml(0-2): 177, 48128, 126619, 49291, 170
https://tests.stockfishchess.org/tests/view/681902de3629b02d74b16f6d
closes https://github.com/official-stockfish/Stockfish/pull/6069
Bench: 2035432
2025-05-19 07:37:15 +02:00
Daniel Monroe and Disservin
1f9af9966f
Simplify futility pruning term
...
Passed simplification STC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 49920 W: 12933 L: 12727 D: 24260
Ptnml(0-2): 141, 5865, 12752, 6051, 151
https://tests.stockfishchess.org/tests/view/681d01d33629b02d74b1756e
Passed simplification LTC
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 68808 W: 17573 L: 17402 D: 33833
Ptnml(0-2): 23, 7343, 19511, 7494, 33
https://tests.stockfishchess.org/tests/view/681e33843629b02d74b176b1
closes https://github.com/official-stockfish/Stockfish/pull/6058
Bench: 2041086
2025-05-13 20:42:36 +02:00
Daniel Monroe and Disservin
af3692b2d0
Simplify second probcut to linear function of depth
...
Passed non-regression STC
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 57472 W: 14962 L: 14765 D: 27745
Ptnml(0-2): 140, 6715, 14817, 6936, 128
https://tests.stockfishchess.org/tests/view/680df1063629b02d74b15b69
Passed non-regression LTC
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 88416 W: 22499 L: 22348 D: 43569
Ptnml(0-2): 31, 9565, 24874, 9698, 40
https://tests.stockfishchess.org/tests/view/680df3a93629b02d74b15b7d
closes https://github.com/official-stockfish/Stockfish/pull/6035
Bench: 1792000
2025-04-27 20:31:40 +02:00
Daniel Monroe and Joost VandeVondele
88a524c552
Tweak futility formula
...
Passed STC
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 248448 W: 64344 L: 63718 D: 120386
Ptnml(0-2): 750, 29172, 63783, 29740, 779
https://tests.stockfishchess.org/tests/view/68056f5598cd372e3aea2901
Passed LTC
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 118824 W: 30358 L: 29874 D: 58592
Ptnml(0-2): 59, 12797, 33228, 13257, 71
https://tests.stockfishchess.org/tests/view/6805675698cd372e3aea20d0
closes https://github.com/official-stockfish/Stockfish/pull/6004
bench 1839796
2025-04-26 22:06:18 +02:00
Daniel Monroe and Disservin
3d18ad719b
Skip 5th continuation history
...
Passed simplification STC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 70208 W: 18098 L: 17914 D: 34196
Ptnml(0-2): 199, 8300, 17907, 8514, 184
https://tests.stockfishchess.org/tests/view/67ed889b31d7cf8afdc451cb
Passed simplification LTC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 485004 W: 122703 L: 122956 D: 239345
Ptnml(0-2): 288, 53162, 135805, 53009, 238
https://tests.stockfishchess.org/tests/view/67ee810231d7cf8afdc452ea
closes https://github.com/official-stockfish/Stockfish/pull/5992
Bench: 1715901
2025-04-18 14:32:26 +02:00
Daniel Monroe and Disservin
904a016396
Don't use 5th continuation history in move ordering
...
Passed simplification STC
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 136960 W: 35374 L: 35262 D: 66324
Ptnml(0-2): 420, 16214, 35049, 16428, 369
https://tests.stockfishchess.org/tests/view/67e6d0ae6682f97da2178ee5
Passed simplification LTC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 233016 W: 59063 L: 59059 D: 114894
Ptnml(0-2): 113, 25430, 65421, 25428, 116
https://tests.stockfishchess.org/tests/view/67e9f7fb31d7cf8afdc44ad4
closes https://github.com/official-stockfish/Stockfish/pull/5978
Bench: 1842721
2025-04-18 14:32:26 +02:00
Daniel Monroe and Disservin
fb6a3e04ec
Simply use non_pawn_material rather than summing tuned terms
...
Passed simplification STC
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 136576 W: 35285 L: 35175 D: 66116
Ptnml(0-2): 410, 16179, 34997, 16295, 407
https://tests.stockfishchess.org/tests/view/67e5dc736682f97da2178da6
Passed rebased simplification LTC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 85482 W: 21812 L: 21658 D: 42012
Ptnml(0-2): 34, 9260, 24022, 9368, 57
https://tests.stockfishchess.org/tests/view/67e852cb31d7cf8afdc44966
closes https://github.com/official-stockfish/Stockfish/pull/5965
Bench: 2006483
2025-04-18 14:32:19 +02:00
Daniel Monroe and Disservin
3d61f932cb
Squash out post-lmr bonus variable
...
Squash out bonus variable for post-lmr now that the bonus is constant.
closes https://github.com/official-stockfish/Stockfish/pull/5953
No functional change
2025-04-02 17:43:40 +02:00
Daniel Monroe and Disservin
f9a6d43286
Simplify condition in futility pruning
...
Passed STC
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 427040 W: 111061 L: 111271 D: 204708
Ptnml(0-2): 1709, 48524, 113171, 48500, 1616
https://tests.stockfishchess.org/tests/view/67af01d01a4c73ae1f930ea4
Passed rebased LTC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 28704 W: 7330 L: 7120 D: 14254
Ptnml(0-2): 8, 3000, 8138, 3186, 20
https://tests.stockfishchess.org/tests/view/67ca629a45214989aa0a123e
closes https://github.com/official-stockfish/Stockfish/pull/5924
Bench: 2050046
2025-03-21 11:09:38 +01:00
Daniel Monroe and Disservin
45b2b06cea
Use same term for small and large net for nnue complexity adjustment
...
Passed simplification STC
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 386496 W: 100682 L: 100850 D: 184964
Ptnml(0-2): 1686, 46399, 97218, 46287, 1658
https://tests.stockfishchess.org/tests/view/67a9cc6d851bb0f25324449e
Passed rebased simplification LTC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 160884 W: 41090 L: 41012 D: 78782
Ptnml(0-2): 133, 17883, 44321, 17983, 122
https://tests.stockfishchess.org/tests/view/67aef2e91a4c73ae1f930e85
closes https://github.com/official-stockfish/Stockfish/pull/5886
Bench: 2962718
2025-02-24 19:07:58 +01:00
Daniel Monroe and Disservin
76c319f438
Simplify ttcut depth condition
...
Simplify ttcut depth condition in a recent tweak of Nonlinear (PR #5876 )
Passed simplification STC
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 235328 W: 61646 L: 61644 D: 112038
Ptnml(0-2): 1039, 27947, 59676, 27977, 1025
https://tests.stockfishchess.org/tests/view/67abc7fba04df5eb8dbeb442
Passed simplification LTC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 63744 W: 16306 L: 16128 D: 31310
Ptnml(0-2): 58, 6918, 17748, 7084, 64
https://tests.stockfishchess.org/tests/view/67abd776a04df5eb8dbeb9c1
closes https://github.com/official-stockfish/Stockfish/pull/5877
Bench: 2667779
2025-02-24 19:03:19 +01:00
Daniel Monroe and Disservin
d54240c50a
Decrease lmr depth if static eval decreases a lot
...
This tweak originally had some more conditions which have been simplified away.
Passed STC
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 60064 W: 15797 L: 15439 D: 28828
Ptnml(0-2): 236, 7080, 15106, 7310, 300
https://tests.stockfishchess.org/tests/view/67a2af9cfedef70e42ac3325
Passed LTC
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 76794 W: 19740 L: 19337 D: 37717
Ptnml(0-2): 61, 8327, 21236, 8694, 79
https://tests.stockfishchess.org/tests/view/67a2c904fedef70e42ac374d
Passed Non-Regression VVLTC scaling check
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 29046 W: 7581 L: 7389 D: 14076
Ptnml(0-2): 2, 2557, 9213, 2749, 2
https://tests.stockfishchess.org/tests/view/67a54b591c4a3ea87241cb83
Passed simplification STC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 212448 W: 55244 L: 55217 D: 101987
Ptnml(0-2): 932, 25283, 53707, 25430, 872
https://tests.stockfishchess.org/tests/view/67aaacb02554387b116f698f
Passed simplification LTC
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 185736 W: 47270 L: 47217 D: 91249
Ptnml(0-2): 141, 20568, 51394, 20627, 138
https://tests.stockfishchess.org/tests/view/67ab8efa133d55b1d3bc1397
closes https://github.com/official-stockfish/Stockfish/pull/5878
Bench: 2512420
2025-02-13 20:17:26 +01:00
Daniel Monroe and Disservin
3a0418c0d0
Simplify opponent worsening
...
Passed simplification STC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 57120 W: 14712 L: 14526 D: 27882
Ptnml(0-2): 53, 6241, 15796, 6407, 63
https://tests.stockfishchess.org/tests/view/67a26153eb183d11c659454d
Passed simplification LTC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 313452 W: 79893 L: 79973 D: 153586
Ptnml(0-2): 279, 35053, 86156, 34945, 293
https://tests.stockfishchess.org/tests/view/67a29fe0fedef70e42ac32ae
closes https://github.com/official-stockfish/Stockfish/pull/5867
Bench: 2582245
2025-02-13 19:45:55 +01:00
Daniel Monroe and Joost VandeVondele
3dfbc5de25
Remove non-pawn material check in qsearch pruning
...
Passed simplification STC
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 47712 W: 12621 L: 12409 D: 22682
Ptnml(0-2): 224, 5349, 12480, 5597, 206
https://tests.stockfishchess.org/tests/view/67a1b4fb612069de394afc37
Passed rebased simplification LTC
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 188274 W: 47727 L: 47677 D: 92870
Ptnml(0-2): 171, 20429, 52867, 20519, 151
https://tests.stockfishchess.org/tests/view/67a2a761fedef70e42ac3300
closes https://github.com/official-stockfish/Stockfish/pull/5866
bench 2654242
2025-02-05 18:56:12 +01:00
Daniel Monroe and Disservin
7690fac5cf
Simp probcut disable condition
...
Disable probcut check when we the ttValue is not at least probCutBeta,
regardless of tt depth.
Passed simplification STC
LLR: 2.92 (-2.94,2.94) <-1.75,0.25>
Total: 60896 W: 16030 L: 15835 D: 29031
Ptnml(0-2): 220, 7164, 15507, 7315, 242
https://tests.stockfishchess.org/tests/view/679c0a3251037ccaf3e3141e
Passed simplification LTC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 76644 W: 19557 L: 19392 D: 37695
Ptnml(0-2): 50, 8486, 21104, 8613, 69
https://tests.stockfishchess.org/tests/view/679c380b0774dfd78deaf35c
closes https://github.com/official-stockfish/Stockfish/pull/5840
Bench: 3543770
2025-02-02 13:39:47 +01:00
Daniel Monroe and Disservin
5ef1f2b132
Refactor prior reduction
...
Make index of reduction consistent with rest of Stack
closes https://github.com/official-stockfish/Stockfish/pull/5832
No functional change
2025-02-02 13:36:58 +01:00
Daniel Monroe and Disservin
ebdc7ba2da
Refactor prior countermove bonus
...
Passed simplification STC
LLR: 2.97 (-2.94,2.94) <-1.75,0.25>
Total: 155424 W: 40252 L: 40159 D: 75013
Ptnml(0-2): 511, 18655, 39328, 18666, 552
https://tests.stockfishchess.org/tests/view/6794084fe96bfb672ad18d90
Passed rebased simplification LTC
LLR: 2.97 (-2.94,2.94) <-1.75,0.25>
Total: 103944 W: 26567 L: 26427 D: 50950
Ptnml(0-2): 69, 11640, 28418, 11772, 73
https://tests.stockfishchess.org/tests/view/67955c9a406a4efe9eb7d7e4
closes https://github.com/official-stockfish/Stockfish/pull/5825
Bench: 1839554
2025-01-26 22:43:02 +01:00
Daniel Monroe and Joost VandeVondele
27e747d1d7
Simplify futility margin in lmr for quiets.
...
Replace the "low bestValue condition" with whether there is a best move.
Passed Simplification STC
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 102560 W: 26517 L: 26367 D: 49676
Ptnml(0-2): 328, 12223, 26036, 12357, 336
https://tests.stockfishchess.org/tests/view/679310e4ca18a2c66da02af8
Passed Simplification LTC
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 66942 W: 17130 L: 16953 D: 32859
Ptnml(0-2): 52, 7459, 18290, 7600, 70
https://tests.stockfishchess.org/tests/view/679459a3e96bfb672ad18ddf
closes https://github.com/official-stockfish/Stockfish/pull/5820
Bench: 1438043
2025-01-25 20:59:33 +01:00
Daniel Monroe and Joost VandeVondele
f00d91f8ac
Refine probcut
...
Allow probcut for depth 3 and disable deeper verification search when it would simply repeat the qsearch.
Passed STC
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 283232 W: 74450 L: 73760 D: 135022
Ptnml(0-2): 1052, 33780, 71349, 34296, 1139
https://tests.stockfishchess.org/tests/view/67843b58460e2910c51ddcc6
Passed LTC
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 339654 W: 86845 L: 85893 D: 166916
Ptnml(0-2): 298, 37734, 92802, 38704, 289
https://tests.stockfishchess.org/tests/view/678aa722c00c743bc9e9face
closes https://github.com/official-stockfish/Stockfish/pull/5797
bench 1288648
2025-01-18 21:27:42 +01:00
Daniel Monroe and Joost VandeVondele
a944f08225
retroactive reduction decrease if eval improves
...
If the previous reduction was large but the static eval improves then increase the search depth. This patch looks at the next node when calculating the reduction, something I don't think has been done before and which can probably used for further elo gaining patches.
Passed STC
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 55936 W: 14813 L: 14462 D: 26661
Ptnml(0-2): 220, 6565, 14094, 6822, 267
https://tests.stockfishchess.org/tests/view/67845b70460e2910c51ddcff
Passed LTC
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 189468 W: 48411 L: 47773 D: 93284
Ptnml(0-2): 180, 20801, 52131, 21445, 177
https://tests.stockfishchess.org/tests/view/6784e2cb460e2910c51ddf86
closes https://github.com/official-stockfish/Stockfish/pull/5785
bench: 1512884
2025-01-18 20:50:04 +01:00
Daniel Monroe and Joost VandeVondele
5868b4cb58
remove eval== staticeval check in fut pruning
...
Simplify corrplexity in futility margin
Don't check that staticEval == eval when applying the corrplexity-based adjustment in futility pruning.
Passed Simplification STC
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 121760 W: 31640 L: 31512 D: 58608
Ptnml(0-2): 349, 14400, 31289, 14458, 384
https://tests.stockfishchess.org/tests/view/6780c4109168c8bf30927777
Passed Simplification LTC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 134772 W: 34245 L: 34140 D: 66387
Ptnml(0-2): 94, 14869, 37350, 14984, 89
https://tests.stockfishchess.org/tests/view/6782d6ea6ddf09c0b4b6dd36
closes https://github.com/official-stockfish/Stockfish/pull/5776
Bench: 1487627
2025-01-18 20:25:59 +01:00
Daniel Monroe and Disservin
1611b9c940
Corrplexity for futility pruning
...
Add corrhist-based term to futility margin
Inspired by a recent patch of Shawn Xu, this tweak increases the margin
over beta needed to futility prune based on the correction history, with
an offset.
Passed STC
LLR: 2.97 (-2.94,2.94) <0.00,2.00>
Total: 545504 W: 141957 L: 140885 D: 262662
Ptnml(0-2): 1829, 64226, 139551, 65336, 1810
https://tests.stockfishchess.org/tests/view/67634a8386d5ee47d95439db
Passed LTC
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 125994 W: 32199 L: 31695 D: 62100
Ptnml(0-2): 97, 13742, 34798, 14280, 80
https://tests.stockfishchess.org/tests/view/6765cf9986d5ee47d9544217
closes https://github.com/official-stockfish/Stockfish/pull/5748
Bench: 999324
2025-01-06 00:46:30 +01:00
Daniel Monroe and Disservin
ba145332c9
Remove time reduction for recaptures
...
Passed simplification STC
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 54016 W: 14098 L: 13902 D: 26016
Ptnml(0-2): 165, 5797, 14919, 5931, 196
https://tests.stockfishchess.org/tests/view/6758a90486d5ee47d954201e
Passed simplification LTC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 296940 W: 75631 L: 75689 D: 145620
Ptnml(0-2): 145, 28928, 90384, 28866, 147
https://tests.stockfishchess.org/tests/view/6758df7a86d5ee47d9542091
closes https://github.com/official-stockfish/Stockfish/pull/5719
Bench: 1148169
2024-12-22 15:17:55 +01:00
Daniel Monroe and Disservin
70bb317afe
Bonus for a prior capture that causes a fail low.
...
This tweak adds a bonus equal to twice the stat_bonus for the current depth for a prior capture that caused a fail high, similar to the prior countermove bonus we currently have.
Passed STC
https://tests.stockfishchess.org/tests/view/673bc14b86d5ee47d953f1f2
LLR: 2.95 (-2.94,2.94) <0.00,2.00>
Total: 105824 W: 27538 L: 27118 D: 51168
Ptnml(0-2): 358, 12370, 27024, 12814, 346
Passed LTC
https://tests.stockfishchess.org/tests/view/673ccbff86d5ee47d953f2d9
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 134502 W: 34340 L: 33820 D: 66342
Ptnml(0-2): 102, 14634, 37229, 15214, 72
closes https://github.com/official-stockfish/Stockfish/pull/5695
Bench: 1107054
2024-12-08 19:46:07 +01:00
Daniel Monroe and Disservin
55905e562a
Simplify movepick coefficients
...
This commit sets movepick weights for all continuation histories to 1
and doubles the weight for the main history, inspired by a recent tune.
Passed STC
https://tests.stockfishchess.org/tests/view/6735151a86d5ee47d953eaa2
LLR: 2.92 (-2.94,2.94) <-1.75,0.25>
Total: 29984 W: 7840 L: 7612 D: 14532
Ptnml(0-2): 85, 3511, 7571, 3741, 84
Passed LTC
https://tests.stockfishchess.org/tests/view/673667a986d5ee47d953ec78
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 26268 W: 6726 L: 6510 D: 13032
Ptnml(0-2): 16, 2797, 7288, 3021, 12
closes https://github.com/official-stockfish/Stockfish/pull/5680
Bench: 1130293
2024-12-08 19:45:48 +01:00
Daniel Monroe and Disservin
fb6be17ad4
Simplify statscore at captures
...
Simplify statscores for captures, setting them to 0
A recent tweak of Vizvezdenec finds substantial elo gain from giving
captures a separate statscore, which is used mainly for reductions. The
idea is that the old combination of quiet histories was inappropriate
and that a value based on the capture history is more suitable. This
simplification sets the statscore for captures to 0, suggesting that the
elo gain came from rectifying the quiet history/capture mismatch.
Passed STC (against a slightly older version of Viz's patch)
https://tests.stockfishchess.org/tests/view/673ac6e286d5ee47d953f0ec
LR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 57312 W: 14872 L: 14672 D: 27768
Ptnml(0-2): 152, 6761, 14649, 6923, 171
Passed LTC (against Viz's newest patch)
https://tests.stockfishchess.org/tests/view/673cd00686d5ee47d953f2db
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 88236 W: 22510 L: 22358 D: 43368
Ptnml(0-2): 70, 9530, 24745, 9724, 49
closes https://github.com/official-stockfish/Stockfish/pull/5691
Bench: 959947
2024-11-22 23:34:15 +01:00
Daniel Monroe and Disservin
e74452ae44
Reduce on ttcaptures if not capture
...
Tweak ttcapture reduction.
Reduce on ttcaptures only if the current move is a capture
Passed STC:
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 94912 W: 24896 L: 24492 D: 45524
Ptnml(0-2): 301, 11197, 24087, 11539, 332
https://tests.stockfishchess.org/tests/view/66cd2264bf8c9d8780fdab34
Passed LTC:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 60738 W: 15465 L: 15096 D: 30177
Ptnml(0-2): 42, 6573, 16775, 6932, 47
https://tests.stockfishchess.org/tests/view/66cf356d9de3e7f9b33d0fde
closes https://github.com/official-stockfish/Stockfish/pull/5562
Bench: 1268700
2024-09-09 17:48:26 +02:00
