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Author SHA1 Message Date
Shawn XuandJoost VandeVondele 94beadffb3 Reintroduce Secondary TT Aging 
Restricted secondary aging in TT to evict stale high-depth entries that could not cutoff.

Passed Non-regression STC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 189792 W: 48752 L: 48702 D: 92338
Ptnml(0-2): 428, 21147, 51711, 21167, 443
https://tests.stockfishchess.org/tests/view/69fae7b6c91f9625ce3253c8

Passed Non-regression LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 234792 W: 59743 L: 59741 D: 115308
Ptnml(0-2): 98, 24714, 67772, 24712, 100
https://tests.stockfishchess.org/tests/view/69ff3aa39392f0c317213e31

See #6742 for information and test results
```
Using ./stockfish_fix1 on KRvK_1000pv.epd with --nodes 1000000 --mate 0
Engine ID:     Stockfish dev-20260505-1429d98e
Total FENs:    1000
Found mates:   620
Best mates:    159

Using ./stockfish_fix1 on KRvK_1000pv.epd with --nodes 10000000 --mate 0
Engine ID:     Stockfish dev-20260505-1429d98e
Total FENs:    1000
Found mates:   1000
Best mates:    709
```

Closes #6576
Closes #6742

closes https://github.com/official-stockfish/Stockfish/pull/6818

Bench: 2821162
 2026-05-17 20:46:31 +02:00
Shawn XuandJoost VandeVondele b63bd7b78e Fix assert 
the assert checks for `bestThreadDecisive && newThreadDecisive`. However `newThreadDecisive` is not guaranteed at this point, leading to assertion failures. This PR rearranges the conditions to ensure correctness.

closes https://github.com/official-stockfish/Stockfish/pull/6716

No functional change
 2026-04-15 19:01:06 +02:00
Shawn XuandJoost VandeVondele 2907ee1a90 Requantize smallnet to nn-47fc8b7fff06.nnue 
Passed Non-regression STC:
LLR: 3.01 (-2.94,2.94) <-1.75,0.25>
Total: 340384 W: 88165 L: 88274 D: 163945
Ptnml(0-2): 1145, 40248, 87571, 40027, 1201
https://tests.stockfishchess.org/tests/view/69a4c49ab4a714eaaa196bc0

Passed Non-regression LTC:
LLR: 2.97 (-2.94,2.94) <-1.75,0.25>
Total: 125922 W: 32222 L: 32106 D: 61594
Ptnml(0-2): 100, 13815, 35002, 13957, 87
https://tests.stockfishchess.org/tests/view/69a9d5f489704e42c5e3a35d

closes https://github.com/official-stockfish/Stockfish/pull/6655

Bench: 2171643
 2026-03-07 22:20:46 +01:00
Shawn XuandJoost VandeVondele 868b63d421 Update main network to nn-9a0cc2a62c52.nnue 
network with new hash encoding.

closes https://github.com/official-stockfish/Stockfish/pull/6651

no functional change
 2026-03-07 22:12:51 +01:00
Shawn XuandDisservin 495296fc76 Remove Secondary TT Aging 
Passed VVLTC w/ STC Bounds:
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 107006 W: 27676 L: 27326 D: 52004
Ptnml(0-2): 21, 9505, 34097, 9863, 17
https://tests.stockfishchess.org/tests/view/6939ac5b75b70713ef796f11

Passed VVLTC w/ LTC Bounds:
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 263190 W: 67547 L: 66837 D: 128806
Ptnml(0-2): 32, 23939, 82942, 24651, 31
https://tests.stockfishchess.org/tests/view/692165823b03dd3a060e666d

closes https://github.com/official-stockfish/Stockfish/pull/6480

Bench: 2800411
 2025-12-21 15:43:32 +01:00
Shawn XuandDisservin 45d034fa50 Formatting fixups 
closes https://github.com/official-stockfish/Stockfish/pull/6446

No functional change
 2025-11-30 21:58:35 +01:00
Shawn XuandDisservin 93f2d14d95 Simplify Incremental Updates 
Passed Non-regression STC:
LLR: 3.03 (-2.94,2.94) <-1.75,0.25>
Total: 277856 W: 71575 L: 71611 D: 134670
Ptnml(0-2): 842, 30719, 75836, 30695, 836
https://tests.stockfishchess.org/tests/view/69169dc17ca8781852331d76

Supersedes #6430

closes https://github.com/official-stockfish/Stockfish/pull/6434

No functional change
 2025-11-30 21:43:54 +01:00
Shawn XuandDisservin 1132d893e0 Simplify Accumulator Updates 
Passed Non-regression STC:
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 146848 W: 37915 L: 37820 D: 71113
Ptnml(0-2): 415, 16159, 40186, 16244, 420
https://tests.stockfishchess.org/tests/view/691772217ca878185233202b

closes https://github.com/official-stockfish/Stockfish/pull/6421

No functional change
 2025-11-30 21:41:51 +01:00
Shawn XuandJoost VandeVondele 035cb146d4 Do more futility pruning 
closes https://github.com/official-stockfish/Stockfish/pull/6433

Bench: 2469519
 2025-11-17 14:03:02 +01:00
Shawn XuandJoost VandeVondele 1d504b927f Fix undefined behavior 
C++ standard does not define `uint8_t` as an allowed pointer alias type. Despite
`uint8_t` being `unsigned char` on most platforms, this is not enforced by the standard.

https://eel.is/c++draft/basic.lval#11
https://stackoverflow.com/a/16138470

closes https://github.com/official-stockfish/Stockfish/pull/6420

No functional change
 2025-11-14 17:43:44 +01:00
Shawn XuandJoost VandeVondele db824e26be Pass accumulator caches by reference 
closes https://github.com/official-stockfish/Stockfish/pull/6416

No functional change
 2025-11-14 17:32:17 +01:00
Shawn XuandJoost VandeVondele bd82b9e01f Cleanup, fix style issues 
use naming convention for variables, functions, constants

closes https://github.com/official-stockfish/Stockfish/pull/6416

no functional change
 2025-11-14 17:29:01 +01:00
Shawn XuandJoost VandeVondele cd7880c030 Simplify Corrhist Bonus 
Passed Non-regression STC:
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 187776 W: 48687 L: 48631 D: 90458
Ptnml(0-2): 570, 22327, 48090, 22279, 622
https://tests.stockfishchess.org/tests/view/68f58019637acd2a11e72233

Passed Non-regression LTC:
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 159378 W: 41027 L: 40946 D: 77405
Ptnml(0-2): 122, 17645, 44078, 17718, 126
https://tests.stockfishchess.org/tests/view/68fe7492637acd2a11e73090

closes https://github.com/official-stockfish/Stockfish/pull/6385

Bench: 2458738
 2025-11-01 11:36:33 +01:00
Shawn XuandJoost VandeVondele 0351652995 Simplify Pawn History Bonus 
Passed Non-regression STC:
LLR: 2.98 (-2.94,2.94) <-1.75,0.25>
Total: 122016 W: 31655 L: 31525 D: 58836
Ptnml(0-2): 388, 14317, 31474, 14435, 394
https://tests.stockfishchess.org/tests/view/68f57e66637acd2a11e7221d

Passed Non-regression LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 81348 W: 21016 L: 20858 D: 39474
Ptnml(0-2): 45, 8793, 22841, 8949, 46
https://tests.stockfishchess.org/tests/view/68f9e2d9637acd2a11e72997

closes https://github.com/official-stockfish/Stockfish/pull/6382

Bench: 2370893
 2025-11-01 11:32:53 +01:00
Shawn XuandJoost VandeVondele f434cc2918 Allow AccumulatorStack::size to point to one past the end 
this is guaranteed to be correct since we access the last element with `size - 1`

closes https://github.com/official-stockfish/Stockfish/pull/6368

fixes https://github.com/official-stockfish/Stockfish/issues/6367

no functional change
 2025-11-01 10:34:44 +01:00
Shawn XuandJoost VandeVondele e5c2dc5edd remove clang-format workaround 
closes https://github.com/official-stockfish/Stockfish/pull/6332

No functional change
 2025-10-05 09:33:42 +02:00
Shawn XuandJoost VandeVondele 5895f47dab Further simplify low ply history in evasions 
Passed Non-regression STC (vs #6308):
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 174208 W: 45414 L: 45343 D: 83451
Ptnml(0-2): 633, 20324, 45095, 20443, 609
https://tests.stockfishchess.org/tests/view/68c24be359efc3c96b611487

Passed Non-regression LTC (vs #6308):
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 110070 W: 28099 L: 27969 D: 54002
Ptnml(0-2): 56, 11919, 30962, 12035, 63
https://tests.stockfishchess.org/tests/view/68c4efa559efc3c96b611dfc

closes https://github.com/official-stockfish/Stockfish/pull/6321

Bench: 2151873
 2025-10-05 09:18:16 +02:00
Shawn XuandJoost VandeVondele 3073d82ccf Simplify use of low-ply history in evasions 
Passed Non-regression STC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 65024 W: 16991 L: 16804 D: 31229
Ptnml(0-2): 182, 7423, 17119, 7602, 186
https://tests.stockfishchess.org/tests/view/68c23f5459efc3c96b6113df

Passed Non-regression LTC:
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 207312 W: 53126 L: 53095 D: 101091
Ptnml(0-2): 126, 21986, 59389, 22041, 114
https://tests.stockfishchess.org/tests/view/68c241e359efc3c96b6113ef

closes https://github.com/official-stockfish/Stockfish/pull/6308

Bench: 2515619
 2025-09-28 21:21:57 +02:00
Shawn XuandJoost VandeVondele c62e71e78f Simplify a separate term in low ply history bonus formula 
Passed Non-regression STC:
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 211200 W: 54887 L: 54860 D: 101453
Ptnml(0-2): 719, 24894, 54296, 25023, 668
https://tests.stockfishchess.org/tests/view/68c21e7f59efc3c96b6112c8

Passed Non-regression LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 217842 W: 55587 L: 55568 D: 106687
Ptnml(0-2): 130, 23651, 61313, 23724, 103
https://tests.stockfishchess.org/tests/view/68c230ec59efc3c96b61135a

closes https://github.com/official-stockfish/Stockfish/pull/6307

Bench: 2070860
 2025-09-28 21:19:22 +02:00
Shawn XuandJoost VandeVondele 415a1ad426 Simplify Probcut Clamp Further 
Passed Non-regression STC:
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 157984 W: 41116 L: 41030 D: 75838
Ptnml(0-2): 568, 18570, 40601, 18714, 539
https://tests.stockfishchess.org/tests/view/68b750518f94a4e5a7fe76cd

Passed Non-regression LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 335232 W: 85443 L: 85543 D: 164246
Ptnml(0-2): 177, 36616, 94137, 36502, 184
https://tests.stockfishchess.org/tests/view/68bc767259efc3c96b61076b

closes https://github.com/official-stockfish/Stockfish/pull/6303

Bench: 2213844
 2025-09-28 21:12:01 +02:00
Shawn XuJoost VandeVondeleDaniel Monroe
 		7a36c0e95f Remove quiet move streak 
Passed Non-regression STC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 67712 W: 17744 L: 17555 D: 32413
Ptnml(0-2): 204, 8030, 17274, 8069, 279
https://tests.stockfishchess.org/tests/view/68b784628f94a4e5a7fe7706

Passed Non-regression LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 196050 W: 50270 L: 50228 D: 95552
Ptnml(0-2): 122, 21465, 54813, 21499, 126
https://tests.stockfishchess.org/tests/view/68ba119d8f94a4e5a7fe7941

closes https://github.com/official-stockfish/Stockfish/pull/6299

Bench: 2238789

Co-authored-by: Daniel Monroe <github.com@danielmonroe.net>
 2025-09-28 21:08:58 +02:00
Shawn XuandJoost VandeVondele d5f152b5df Reintroduce #6259 
Reintroduces af181d9, which no longer regresses on matetrack after #6286

Using ./stockfish on matetrack.epd with --nodes 1000000
Engine ID:     Stockfish dev-20250902-adfddd2c
Total FENs:    6554
Found mates:   3490
Best mates:    2429

Passed Non-regression LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 37608 W: 9726 L: 9523 D: 18359
Ptnml(0-2): 16, 4001, 10578, 4182, 27
https://tests.stockfishchess.org/tests/view/68b886778f94a4e5a7fe77d9

closes https://github.com/official-stockfish/Stockfish/pull/6289

Bench: 2493363
 2025-09-06 07:55:14 +02:00
Shawn XuandJoost VandeVondele adfddd2c98 Add scaling note to STC/LTC tunes 
It has been repeatedly shown that such tunes are suspectible to become
anti-scaling. Below are some recent examples:

https://github.com/official-stockfish/Stockfish/commit/2e91a8635468e40c89a2303ce50384864d088611
https://github.com/official-stockfish/Stockfish/commit/d11f49b790429c236a1a4169f0d8052635fc03dc

Passed STC:
LLR: 2.95 (-2.94,2.94) <0.00,2.00>
Total: 32448 W: 8651 L: 8342 D: 15455
Ptnml(0-2): 81, 3695, 8408, 3914, 126
https://tests.stockfishchess.org/tests/view/6899489b0049e8ccef9d64ad

Passed LTC:
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 73854 W: 19042 L: 18649 D: 36163
Ptnml(0-2): 37, 7908, 20659, 8271, 52
https://tests.stockfishchess.org/tests/view/689abbe7fd8719b088c8d514

Revert VVLTC with STC bound:
LLR: 2.95 (-2.94,2.94) <0.00,2.00>
Total: 53802 W: 14030 L: 13740 D: 26032
Ptnml(0-2): 5, 4924, 16754, 5212, 6
https://tests.stockfishchess.org/tests/view/68a9a9f575da51a345a5a675

Revert VVLTC with LTC bound:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 53658 W: 14022 L: 13699 D: 25937
Ptnml(0-2): 3, 4894, 16712, 5217, 3
https://tests.stockfishchess.org/tests/view/68a8d2b2b6fb3300203bca77

https://tests.stockfishchess.org/tests/view/688cf38bf17748b4d23c8057
https://tests.stockfishchess.org/tests/view/6890bc7792fcad741b804a19

Passed LTC:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 74928 W: 19466 L: 19071 D: 36391
Ptnml(0-2): 37, 8048, 20901, 8439, 39

Failed Non-regression VLTC:
LLR: -2.94 (-2.94,2.94) <-1.75,0.25>
Total: 57704 W: 14643 L: 14928 D: 28133
Ptnml(0-2): 5, 5925, 17280, 5634, 8
https://tests.stockfishchess.org/tests/view/6890bc7792fcad741b804a19

(Note that an STC-tuned version passed non-regression, but was shortly
simplified)

https://github.com/official-stockfish/Stockfish/pull/6040

Passed STC:
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 27776 W: 7352 L: 7054 D: 13370
Ptnml(0-2): 68, 3126, 7221, 3386, 87
https://tests.stockfishchess.org/tests/view/680ec0f83629b02d74b1605b

Passed LTC:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 161304 W: 41432 L: 40864 D: 79008
Ptnml(0-2): 61, 17305, 45357, 17863, 66
https://tests.stockfishchess.org/tests/view/680ec7f93629b02d74b16084

Failed Non-regression VVLTC:
LLR: -2.94 (-2.94,2.94) <-1.75,0.25>
Total: 313466 W: 80573 L: 81089 D: 151804
Ptnml(0-2): 38, 29689, 97782, 29199, 25
https://tests.stockfishchess.org/tests/view/6810d0533629b02d74b16756

https://github.com/official-stockfish/Stockfish/pull/5907
https://github.com/official-stockfish/Stockfish/pull/5887

Passed LTC with STC bounds:
https://tests.stockfishchess.org/tests/view/67b115dd6c6b9e172ad1592f
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 75756 W: 19393 L: 19044 D: 37319
Ptnml(0-2): 60, 8251, 20913, 8588, 66

Passed LTC with LTC bounds:
https://tests.stockfishchess.org/tests/view/67af5f5d6c6b9e172ad15765
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 108126 W: 27880 L: 27412 D: 52834
Ptnml(0-2): 85, 11786, 29866, 12228, 98

Revert VVLTC w/ STC bounds:
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 56342 W: 14536 L: 14246 D: 27560
Ptnml(0-2): 7, 5061, 17741, 5359, 3
https://tests.stockfishchess.org/tests/view/67be4f8ad8d5c2c657c52d10

Revert VVLTC w/ LTC bounds:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 66562 W: 17364 L: 17016 D: 32182
Ptnml(0-2): 3, 6145, 20637, 6493, 3
https://tests.stockfishchess.org/tests/view/67bcd25ff6b602bd7222ea40

closes https://github.com/official-stockfish/Stockfish/pull/6284

no functional change
 2025-09-02 20:42:03 +02:00
Shawn XuandJoost VandeVondele f2da0ccf3f Simplify SMP Reduction 
Passed Non-regression SMP STC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 232784 W: 59845 L: 59841 D: 113098
Ptnml(0-2): 289, 26459, 62934, 26379, 331
https://tests.stockfishchess.org/tests/view/68ab96bf75da51a345a5acd6

Passed Non-regression SMP LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 374270 W: 95978 L: 96113 D: 182179
Ptnml(0-2): 118, 38575, 109888, 38432, 122
https://tests.stockfishchess.org/tests/view/68abcf1c75da51a345a5adb6

closes https://github.com/official-stockfish/Stockfish/pull/6285

Bench: 2667107
 2025-09-02 20:41:08 +02:00
Shawn XuandJoost VandeVondele 75ac6c7a06 simplify stalemate further 
Non-regression STC:
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 155200 W: 40650 L: 40562 D: 73988
Ptnml(0-2): 533, 17588, 41258, 17700, 521
https://tests.stockfishchess.org/tests/view/68abe11375da51a345a5adec

Non-regression LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 82824 W: 21442 L: 21287 D: 40095
Ptnml(0-2): 51, 8738, 23675, 8901, 47
https://tests.stockfishchess.org/tests/view/68b205606217b8721dca9c8e

10k Stalemate:
Elo: 1.46 ± 1.2 (95%) LOS: 99.0%
Total: 10000 W: 4640 L: 4598 D: 762
Ptnml(0-2): 0, 140, 4678, 182, 0
https://tests.stockfishchess.org/tests/view/68b2059b6217b8721dca9c90

closes https://github.com/official-stockfish/Stockfish/pull/6283

Bench: 2431727
 2025-09-02 20:39:02 +02:00
Shawn XuandJoost VandeVondele 3f18352396 Further Simplify Stalemate Detection 
Passed Non-regression STC:
LLR: 2.98 (-2.94,2.94) <-1.75,0.25>
Total: 191520 W: 49633 L: 49582 D: 92305
Ptnml(0-2): 557, 20676, 53260, 20693, 574
https://tests.stockfishchess.org/tests/view/68ab570075da51a345a5abe1

Passed Non-regression LTC:
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 212934 W: 54643 L: 54618 D: 103673
Ptnml(0-2): 117, 22417, 61364, 22462, 107
https://tests.stockfishchess.org/tests/view/68ab84e975da51a345a5ac6b

10k Stalemate:
Elo: 0.35 ± 1.2 (95%) LOS: 71.6%
Total: 10000 W: 4602 L: 4592 D: 806
Ptnml(0-2): 0, 148, 4694, 158, 0
nElo: 1.99 ± 6.8 (95%) PairsRatio: 1.07
https://tests.stockfishchess.org/tests/view/68abeb8175da51a345a5af82

closes https://github.com/official-stockfish/Stockfish/pull/6268

Bench: 2420973
 2025-08-30 15:12:06 +02:00
Shawn XuJoost VandeVondeleDaniel Monroe
 		7d213afd37 Non-functional simplifications 
closes https://github.com/official-stockfish/Stockfish/pull/6267

No functional change

Co-authored-by: Daniel Monroe <github.com@danielmonroe.net>
 2025-08-30 15:09:47 +02:00
Shawn XuandJoost VandeVondele a289ee389a Simplify Capture Futility Pruning 
Passed Non-regression STC:
LLR: 2.97 (-2.94,2.94) <-1.75,0.25>
Total: 187904 W: 48639 L: 48583 D: 90682
Ptnml(0-2): 560, 22150, 48502, 22154, 586
https://tests.stockfishchess.org/tests/view/68aad56075da51a345a5a9e3

Passed Non-regression LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 94302 W: 24246 L: 24101 D: 45955
Ptnml(0-2): 44, 10274, 26371, 10417, 45
https://tests.stockfishchess.org/tests/view/68ab541975da51a345a5aacf

closes https://github.com/official-stockfish/Stockfish/pull/6266

Bench: 2376717
 2025-08-30 15:09:00 +02:00
Shawn XuandJoost VandeVondele 678d503d8f Simplify LMR Extensions 
Passed Non-regression STC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 236896 W: 61683 L: 61683 D: 113530
Ptnml(0-2): 730, 28057, 60901, 28003, 757
https://tests.stockfishchess.org/tests/view/68a9c20475da51a345a5a6a0

Passed Non-regression LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 73644 W: 18936 L: 18770 D: 35938
Ptnml(0-2): 33, 7951, 20685, 8123, 30
https://tests.stockfishchess.org/tests/view/68aa95c575da51a345a5a88a

closes https://github.com/official-stockfish/Stockfish/pull/6265

Bench:  2693376
 2025-08-24 20:10:43 +02:00
Shawn XuandJoost VandeVondele e2fdf6f005 Simplify separate malus formulas 
Passed Non-regression STC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 16352 W: 4336 L: 4090 D: 7926
Ptnml(0-2): 54, 1832, 4157, 2080, 53
https://tests.stockfishchess.org/tests/view/68a808f0b6fb3300203bca08

Passed Non-regression LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 94014 W: 24129 L: 23986 D: 45899
Ptnml(0-2): 47, 9917, 26934, 10064, 45
https://tests.stockfishchess.org/tests/view/68a8f45cb6fb3300203bcb5e

closes https://github.com/official-stockfish/Stockfish/pull/6256

Bench: 2483704
 2025-08-24 19:55:35 +02:00
Shawn XuandJoost VandeVondele 901ad7e7ee Simplify quiet move streak 
Passed Non-regression STC:
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 46272 W: 12076 L: 11866 D: 22330
Ptnml(0-2): 140, 5407, 11860, 5561, 168
https://tests.stockfishchess.org/tests/view/68a9c26575da51a345a5a6a2

Passed Non-regression LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 140442 W: 35984 L: 35886 D: 68572
Ptnml(0-2): 72, 15333, 39305, 15447, 64
https://tests.stockfishchess.org/tests/view/68aa245e75da51a345a5a80d

closes https://github.com/official-stockfish/Stockfish/pull/6258

Bench: 2931171
 2025-08-24 19:52:42 +02:00
Shawn XuandJoost VandeVondele 85f87649bf Simplify stalemate detection 
Passed Non-regression STC:
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 107392 W: 27959 L: 27818 D: 51615
Ptnml(0-2): 317, 12094, 28735, 12231, 319
https://tests.stockfishchess.org/tests/view/68a65d8ab6fb3300203bc825

Passed Non-regression LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 94014 W: 24129 L: 23986 D: 45899
Ptnml(0-2): 47, 9917, 26934, 10064, 45
https://tests.stockfishchess.org/tests/view/68a8f45cb6fb3300203bcb5e

Passed Stalemate 10k:
Elo: 2.22 ± 1.3 (95%) LOS: 100.0%
Total: 10000 W: 4626 L: 4562 D: 812
Ptnml(0-2): 1, 137, 4659, 203, 0
nElo: 12.00 ± 6.8 (95%) PairsRatio: 1.47
https://tests.stockfishchess.org/tests/view/68a65d8ab6fb3300203bc825

Supersedes #6114
Closes #6232

closes https://github.com/official-stockfish/Stockfish/pull/6255

Bench: 2473929
 2025-08-24 19:50:51 +02:00
Shawn XuandJoost VandeVondele 14a2e50a3d Simplify key after 
Passed Non-regression STC:
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 534016 W: 139438 L: 139771 D: 254807
Ptnml(0-2): 2098, 63469, 136136, 63278, 2027
https://tests.stockfishchess.org/tests/view/688ac64d502b34dd5e7110a4

Passed Non-regression LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 43980 W: 11346 L: 11149 D: 21485
Ptnml(0-2): 31, 4689, 12353, 4886, 31
https://tests.stockfishchess.org/tests/view/688ea8a47d68fe4f7f130eb3

closes https://github.com/official-stockfish/Stockfish/pull/6207

Bench: 2884232
 2025-08-04 15:07:37 +02:00
Shawn XuandJoost VandeVondele e2aa125570 Consistent syntax for class members 
Currently, search.cpp uses three different syntax when accessing class member variables

* thisThread object references. This was a remnant from when pos.this_thread() was necessary for thread-local variable access
* this object references
* implicit member variable access

This PR aims to deprecate thisThread and standardize this syntax to implicit variable access, which is consistent with the rest of SF's codebase.

closes https://github.com/official-stockfish/Stockfish/pull/6154

no functional change
 2025-07-24 10:13:24 +02:00
Shawn XuandDisservin 318c948c4d Remove non-functional low-ply history fill 
lowPlyHistory is always cleared at the start of `iterative_deepening`, so clearing it here is non-functional.

closes https://github.com/official-stockfish/Stockfish/pull/6144

No functional change
 2025-07-02 18:31:04 +02:00
Shawn XuandJoost VandeVondele 5337edfdb6 remove non-functional else 
since we break out of the loop in the other branch

closes https://github.com/official-stockfish/Stockfish/pull/6116

no functional change
 2025-06-02 22:12:37 +02:00
Shawn XuandJoost VandeVondele 259bdaaa9f Remove an unnecessary bound check 
When failing high, it is always true that `alpha < beta` and `beta <=
bestValue`. Therefore if alpha and bestValue is not in decisive range, it is
guaranteed that beta is not.

closes https://github.com/official-stockfish/Stockfish/pull/6115

no functional change
 2025-06-02 21:57:19 +02:00
Shawn XuandJoost VandeVondele c9af7674bc Introduce Secondary TT Aging 
When a high-depth TT entry fail to produce a cutoff, decrease the stored depth
by 1. This is intended to help cases such as #5023
(https://github.com/official-stockfish/Stockfish/issues/5023#issuecomment-2814209391),
where entries with extremely high depths prevent TT cutoffs, contributing to
search explosions.

Passed STC:
LLR: 2.95 (-2.94,2.94) <0.00,2.00>
Total: 128800 W: 33502 L: 33053 D: 62245
Ptnml(0-2): 331, 15084, 33149, 15477, 359
https://tests.stockfishchess.org/tests/view/683958e56ec7634154f9d2a9

Passed LTC:
LLR: 2.97 (-2.94,2.94) <0.50,2.50>
Total: 63288 W: 16376 L: 16005 D: 30907
Ptnml(0-2): 26, 6712, 17798, 7081, 27
https://tests.stockfishchess.org/tests/view/683aa4026ec7634154f9d469

closes https://github.com/official-stockfish/Stockfish/pull/6113

Bench: 2144705
 2025-06-02 21:55:55 +02:00
Shawn XuandJoost VandeVondele d0212906bd Simplify stat eval history adjustment further 
closes https://github.com/official-stockfish/Stockfish/pull/6106

bench 2074807
 2025-06-02 21:37:37 +02:00
Shawn XuandJoost VandeVondele dc85c5a4c9 Remove nnz lookup table load optimization 
Passed Non-regression STC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 63296 W: 16491 L: 16311 D: 30494
Ptnml(0-2): 129, 6624, 17972, 6784, 139
https://tests.stockfishchess.org/tests/view/6833ce486ec7634154f9cb22

Passed 2nd Non-regression STC:
LLR: 2.97 (-2.94,2.94) <-1.75,0.25>
Total: 369568 W: 95314 L: 95451 D: 178803
Ptnml(0-2): 897, 40231, 102601, 40222, 833
https://tests.stockfishchess.org/tests/view/68355c956ec7634154f9ce07

closes https://github.com/official-stockfish/Stockfish/pull/6100

no functional change
 2025-06-02 21:21:54 +02:00
Shawn XuandJoost VandeVondele 00b1540e01 Always Decrease Reduction on TTMove 
Passed VVLTC w/ LTC Bounds:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 57792 W: 15005 L: 14676 D: 28111
Ptnml(0-2): 2, 5241, 18082, 5568, 3
https://tests.stockfishchess.org/tests/view/682a0e3c6ec7634154f9a07e

Passed VVLTC w/ STC Bounds:
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 372298 W: 96342 L: 95655 D: 180301
Ptnml(0-2): 37, 34598, 116181, 35307, 26
https://tests.stockfishchess.org/tests/view/682a45b16ec7634154f9a3b3

STC Elo Estimate:
Elo: 0.15 ± 1.4 (95%) LOS: 58.3%
Total: 59612 W: 15414 L: 15388 D: 28810
Ptnml(0-2): 166, 6959, 15527, 6991, 163
nElo: 0.30 ± 2.8 (95%) PairsRatio: 1.00
https://tests.stockfishchess.org/tests/view/68335d276ec7634154f9c25c

closes https://github.com/official-stockfish/Stockfish/pull/6095

bench 2634355
 2025-05-25 21:19:59 +02:00
Shawn XuandJoost VandeVondele e6ec4705a8 Remove deprecated arch from codeql 
closes https://github.com/official-stockfish/Stockfish/pull/6090

no functional change
 2025-05-25 21:00:38 +02:00
Shawn XuandJoost VandeVondele 472cc764be Move SIMD code to a separate header 
Passed Non-regression STC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 115328 W: 29903 L: 29777 D: 55648
Ptnml(0-2): 265, 12293, 32444, 12375, 287
https://tests.stockfishchess.org/tests/view/68300e086ec7634154f9b1d1

closes https://github.com/official-stockfish/Stockfish/pull/6086

no functional change
 2025-05-25 20:52:57 +02:00
Shawn XuandJoost VandeVondele 347e328fdb Simplify TT Replacement Strategy 
Passed Non-regression STC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 50528 W: 13160 L: 12958 D: 24410
Ptnml(0-2): 132, 5681, 13439, 5877, 135
https://tests.stockfishchess.org/tests/view/682a8b296ec7634154f9a785

Passed Non-regression STC w/ High Hash Pressure:
LLR: 2.98 (-2.94,2.94) <-1.75,0.25>
Total: 30048 W: 7849 L: 7621 D: 14578
Ptnml(0-2): 75, 3390, 7884, 3582, 93
https://tests.stockfishchess.org/tests/view/682a9caf6ec7634154f9a7ae

Passed Non-regression LTC w/ High Hash Pressure:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 17610 W: 4584 L: 4362 D: 8664
Ptnml(0-2): 7, 1799, 4974, 2015, 10
https://tests.stockfishchess.org/tests/view/682ab3966ec7634154f9a8c8

closes https://github.com/official-stockfish/Stockfish/pull/6079

Bench: 2422771
 2025-05-19 20:49:28 +02:00
Shawn XuandJoost VandeVondele 0f102f3692 Simplify Quiet Early Move Penalty 
Passed STC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 185344 W: 47995 L: 47939 D: 89410
Ptnml(0-2): 527, 21898, 47754, 21978, 515
https://tests.stockfishchess.org/tests/view/682a47536ec7634154f9a3bc

Passed LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 101706 W: 26050 L: 25912 D: 49744
Ptnml(0-2): 53, 11056, 28499, 11190, 55
https://tests.stockfishchess.org/tests/view/682a61736ec7634154f9a50e

closes https://github.com/official-stockfish/Stockfish/pull/6072

Bench: 2012032
 2025-05-19 07:45:28 +02:00
Shawn XuandJoost VandeVondele 39942db3ff Simplify In-Check Statscore 
Passed Non-regression STC:
LLR: 2.98 (-2.94,2.94) <-1.75,0.25>
Total: 129760 W: 33701 L: 33580 D: 62479
Ptnml(0-2): 359, 15248, 33575, 15309, 389
https://tests.stockfishchess.org/tests/view/681a88193629b02d74b17123

Passed Non-regression LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 519612 W: 132224 L: 132512 D: 254876
Ptnml(0-2): 246, 56823, 145960, 56527, 250
https://tests.stockfishchess.org/tests/view/681f9ed43629b02d74b177c3

closes https://github.com/official-stockfish/Stockfish/pull/6070

bench: 2046462
 2025-05-19 07:39:56 +02:00
Shawn XuandJoost VandeVondele 6f445631ab Simplify Futility Margin 
Passed STC Non-regression:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 159008 W: 41500 L: 41414 D: 76094
Ptnml(0-2): 501, 18821, 40759, 18937, 486
https://tests.stockfishchess.org/tests/view/680ff9e23629b02d74b1663a

Passed LTC Non-regression:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 163572 W: 41617 L: 41543 D: 80412
Ptnml(0-2): 90, 17755, 46024, 17825, 92
https://tests.stockfishchess.org/tests/view/6814dd973629b02d74b16bac

closes https://github.com/official-stockfish/Stockfish/pull/6065

Bench: 2018775
 2025-05-19 07:22:20 +02:00
Shawn XuandJoost VandeVondele e4b0f37493 Shrink Enum Sizes 
Passed STC:
LLR: 2.95 (-2.94,2.94) <0.00,2.00>
Total: 110848 W: 28974 L: 28564 D: 53310
Ptnml(0-2): 302, 12118, 30132, 12612, 260
https://tests.stockfishchess.org/tests/view/68242770a527315e07ccca38

closes https://github.com/official-stockfish/Stockfish/pull/6063

no functional change
 2025-05-19 07:17:39 +02:00
Shawn XuandJoost VandeVondele 6b7e05f0c5 Simplify PCM TTMove Bonus 
Passed Non-regression STC:
LLR: 2.97 (-2.94,2.94) <-1.75,0.25>
Total: 114048 W: 29597 L: 29459 D: 54992
Ptnml(0-2): 315, 13619, 29045, 13703, 342
https://tests.stockfishchess.org/tests/view/681e83533629b02d74b17701

Passed Non-regression LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 61014 W: 15582 L: 15405 D: 30027
Ptnml(0-2): 25, 6485, 17307, 6668, 22
https://tests.stockfishchess.org/tests/view/68226b523629b02d74b17b89

closes https://github.com/official-stockfish/Stockfish/pull/6061

bench 2016566
 2025-05-19 07:13:39 +02:00
Shawn XuandDisservin b5f11085dd Do more extensions in nodes far from the root 
Parameters found by @FauziAkram in the latest tune.

Passed VVLTC w/ LTC Bound:
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 243264 W: 63452 L: 62774 D: 117038
Ptnml(0-2): 18, 22494, 75934, 23164, 22
https://tests.stockfishchess.org/tests/view/680e82b23629b02d74b15e27

Passed VVLTC w/ STC Bound:
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 37838 W: 9935 L: 9667 D: 18236
Ptnml(0-2): 6, 3383, 11873, 3651, 6
https://tests.stockfishchess.org/tests/view/681e707a3629b02d74b176e8

STC Elo Estimate:
Elo: -0.49 ± 2.4 (95%) LOS: 34.8%
Total: 20000 W: 5118 L: 5146 D: 9736
Ptnml(0-2): 55, 2365, 5182, 2349, 49
nElo: -0.96 ± 4.8 (95%) PairsRatio: 0.99
https://tests.stockfishchess.org/tests/view/6822af4b3629b02d74b17be6

closes https://github.com/official-stockfish/Stockfish/pull/6059

Bench: 2135382
 2025-05-13 20:46:27 +02:00
Shawn XuandDisservin e9925b122f Simplify ttCapture LMR 
Passed Non-regression STC:
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 51104 W: 13389 L: 13184 D: 24531
Ptnml(0-2): 182, 5940, 13068, 6215, 147
https://tests.stockfishchess.org/tests/view/680ef2503629b02d74b16498

Passed Non-regression LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 73350 W: 18804 L: 18638 D: 35908
Ptnml(0-2): 30, 7906, 20639, 8068, 32
https://tests.stockfishchess.org/tests/view/6810510e3629b02d74b1668a

closes https://github.com/official-stockfish/Stockfish/pull/6044

Bench: 1805151
 2025-05-13 20:36:42 +02:00
Shawn XuandDisservin 81cc004060 Remove risk tolerance 
Passed STC:
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 379328 W: 97567 L: 97724 D: 184037
Ptnml(0-2): 909, 44861, 98314, 44638, 942
https://tests.stockfishchess.org/tests/view/680defc63629b02d74b15b62

Passed LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 160752 W: 40762 L: 40685 D: 79305
Ptnml(0-2): 60, 17548, 45091, 17609, 68
https://tests.stockfishchess.org/tests/view/680e8ff43629b02d74b15e65

closes https://github.com/official-stockfish/Stockfish/pull/6037

Bench: 1897340
 2025-05-13 20:31:37 +02:00
Shawn XuandDisservin b0a7a34d3f Simplify malus calculation 
closes https://github.com/official-stockfish/Stockfish/pull/6024

No functional change
 2025-04-27 19:43:47 +02:00
Shawn XuandDisservin 4e49f8dff9 Clean up search 
* Correct IIR scaling comments
* Replace `(PvNode || cutNode)` with `!allNode`
* Consistent formatting for scaler tags
* Add comments to some recently-introduced LMR terms
* Add comments on PCM bonus tweaks

Passed Non-regression STC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 389472 W: 102457 L: 102622 D: 184393
Ptnml(0-2): 1676, 41887, 107798, 41676, 1699
https://tests.stockfishchess.org/tests/view/67a0ea670774dfd78deb23cd

closes https://github.com/official-stockfish/Stockfish/pull/5854

Bench: 1585741
 2025-04-27 19:26:02 +02:00
Shawn XuandJoost VandeVondele 4176ad7b0a simplify risk tolerance 
Passed Non-regression STC:
LLR: 2.98 (-2.94,2.94) <-1.75,0.25>
Total: 73408 W: 19028 L: 18844 D: 35536
Ptnml(0-2): 201, 8709, 18743, 8807, 244
https://tests.stockfishchess.org/tests/view/68051f3698cd372e3ae9f63a

Passed Non-regression LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 91236 W: 23193 L: 23045 D: 44998
Ptnml(0-2): 34, 9908, 25599, 10030, 47
https://tests.stockfishchess.org/tests/view/6805239498cd372e3ae9fa41

closes https://github.com/official-stockfish/Stockfish/pull/6000

bench 1864632
 2025-04-26 21:49:38 +02:00
Shawn XuandJoost VandeVondele 16cd38dba1 Tweak TT Move Reduction by TT Move History 
Passed STC:
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 62496 W: 16197 L: 15844 D: 30455
Ptnml(0-2): 200, 7234, 16011, 7619, 184
https://tests.stockfishchess.org/tests/view/67f7fa9b31d7cf8afdc4609c

Passed LTC:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 400470 W: 102068 L: 101012 D: 197390
Ptnml(0-2): 201, 43207, 112347, 44295, 185
https://tests.stockfishchess.org/tests/view/67f927b0cd501869c66975e0

Passed VVLTC Non-regression:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 125394 W: 32408 L: 32304 D: 60682
Ptnml(0-2): 3, 11702, 39188, 11796, 8
https://tests.stockfishchess.org/tests/view/6804c215cd501869c66986b9

closes https://github.com/official-stockfish/Stockfish/pull/5998

bench 1760988
 2025-04-26 21:43:11 +02:00
Shawn XuandJoost VandeVondele b915ed702a remove StateInfo::next 
unused.

closes https://github.com/official-stockfish/Stockfish/pull/5997

no functional change
 2025-04-26 21:37:17 +02:00
Shawn XuandJoost VandeVondele f273eea71f Remove non-functional accumulator reset 
Passed Non-regression STC:
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 219360 W: 56600 L: 56583 D: 106177
Ptnml(0-2): 582, 23419, 61620, 23518, 541
https://tests.stockfishchess.org/tests/view/67fad20dcd501869c669780f

closes https://github.com/official-stockfish/Stockfish/pull/5986

no functional change
 2025-04-26 21:30:01 +02:00
Shawn XuandDisservin 2b4926e091 Simplify TT Move History 
Part 1 passed Non-regression STC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 195552 W: 50394 L: 50349 D: 94809
Ptnml(0-2): 581, 23222, 50122, 23273, 578
https://tests.stockfishchess.org/tests/view/67eb6ea831d7cf8afdc44c30

Part 2 passed Non-regression STC:
LLR: 2.92 (-2.94,2.94) <-1.75,0.25>
Total: 181664 W: 46786 L: 46727 D: 88151
Ptnml(0-2): 517, 21403, 46974, 21380, 558
https://tests.stockfishchess.org/tests/view/67eb6f3331d7cf8afdc44c33

Passed Non-regression LTC:
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 155454 W: 39496 L: 39412 D: 76546
Ptnml(0-2): 77, 16950, 43580, 17052, 68
https://tests.stockfishchess.org/tests/view/67eee76531d7cf8afdc45358

Passed Non-regression VLTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 118266 W: 30263 L: 30148 D: 57855
Ptnml(0-2): 11, 11844, 35309, 11957, 12
https://tests.stockfishchess.org/tests/view/67f2414a31d7cf8afdc45760

closes https://github.com/official-stockfish/Stockfish/pull/5987

Bench: 1792850
 2025-04-18 14:32:26 +02:00
Shawn XuandDisservin d7c04a9429 Introduce TT Move History Double Extensions 
Passed VVLTC w/ STC bounds:
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 74918 W: 19436 L: 19120 D: 36362
Ptnml(0-2): 6, 6890, 23354, 7200, 9
https://tests.stockfishchess.org/tests/view/67e4a1088888403457d878bb

Passed VVLTC w/ LTC bounds:
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 111706 W: 29050 L: 28619 D: 54037
Ptnml(0-2): 13, 10218, 34959, 10651, 12
https://tests.stockfishchess.org/tests/view/67d6877c517865b4a2dfd36b

STC Elo Estimate:
Elo: 1.26 ± 2.0 (95%) LOS: 88.8%
Total: 30000 W: 7855 L: 7746 D: 14399
Ptnml(0-2): 104, 3531, 7630, 3622, 113
nElo: 2.44 ± 3.9 (95%) PairsRatio: 1.03
https://tests.stockfishchess.org/tests/view/67eacb8c31d7cf8afdc44b99

closes https://github.com/official-stockfish/Stockfish/pull/5961

Bench: 1887897
 2025-04-02 17:53:05 +02:00
Shawn XuandDisservin d2cb927a04 Simplify TT cutoff conthist updates 
Passed Non-regression STC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 86304 W: 22251 L: 22084 D: 41969
Ptnml(0-2): 250, 10214, 22123, 10249, 316
https://tests.stockfishchess.org/tests/view/67db60cd8c7f315cc372aae7

Passed Non-regression LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 199158 W: 50655 L: 50617 D: 97886
Ptnml(0-2): 103, 21579, 56182, 21607, 108
https://tests.stockfishchess.org/tests/view/67dcdc5b8c7f315cc372ac12

closes https://github.com/official-stockfish/Stockfish/pull/5945

Bench: 2069191
 2025-04-02 17:37:02 +02:00
Shawn XuandDisservin ee35a51c40 Remove extra division 
closes https://github.com/official-stockfish/Stockfish/pull/5943

No functional change
 2025-04-02 17:34:37 +02:00
Shawn XuandDisservin c2ff7a95c3 Cleanup fused updates 
Passed Non-regression STC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 70656 W: 18257 L: 18077 D: 34322
Ptnml(0-2): 217, 7912, 18879, 8114, 206
https://tests.stockfishchess.org/tests/view/67e23ae78888403457d876d4

closes https://github.com/official-stockfish/Stockfish/pull/5941

No functional change
 2025-04-02 17:34:31 +02:00
Shawn XuandDisservin 9045f17c3f Simplify captures PCM 
Passed Non-regression STC:
LLR: 2.92 (-2.94,2.94) <-1.75,0.25>
Total: 229856 W: 59258 L: 59252 D: 111346
Ptnml(0-2): 746, 27330, 58714, 27448, 690
https://tests.stockfishchess.org/tests/view/67d3fdac517865b4a2dfcef4

Passed Non-regression LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 107652 W: 27470 L: 27338 D: 52844
Ptnml(0-2): 56, 11646, 30280, 11798, 46
https://tests.stockfishchess.org/tests/view/67d5f972517865b4a2dfd2ec

closes https://github.com/official-stockfish/Stockfish/pull/5931

Bench: 1842520
 2025-03-21 11:19:45 +01:00
Shawn XuandDisservin fc0e0a44d4 Refactor accumulator storage/updates 
Passed Non-regression STC:
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 115840 W: 29983 L: 29854 D: 56003
Ptnml(0-2): 338, 12990, 31149, 13091, 352
https://tests.stockfishchess.org/tests/view/67d0a044166a3e8781d84223

closes https://github.com/official-stockfish/Stockfish/pull/5927

No functional change
 2025-03-21 11:12:47 +01:00
Shawn XuandDisservin 66aee01bb1 Simplify Return Value Adjustment Condition 
Passed Non-regression STC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 82112 W: 21281 L: 21110 D: 39721
Ptnml(0-2): 258, 9630, 21112, 9795, 261
https://tests.stockfishchess.org/tests/view/67c42528b7226b5d8a2dd3a0

Passed Non-regression LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 182652 W: 46295 L: 46240 D: 90117
Ptnml(0-2): 103, 20025, 51003, 20104, 91
https://tests.stockfishchess.org/tests/view/67c4d56b685e87e15e7c43d8

closes https://github.com/official-stockfish/Stockfish/pull/5925

Bench: 1711791
 2025-03-21 11:11:12 +01:00
Shawn XuandDisservin e3660b47bd Add dbg_clear helper function 
closes https://github.com/official-stockfish/Stockfish/pull/5921

No functional change
 2025-03-21 11:09:28 +01:00
Shawn XuandDisservin b825ea6e57 Improve Perft Testing 
Added #5909 problematic position and chess-library DFRC positions to
perft testing. Additional work done by @Disservin to clean up and
improve error reporting.

closes https://github.com/official-stockfish/Stockfish/pull/5917

No functional change

Co-authored-by: disservin <disservin.social@gmail.com>
 2025-03-21 11:03:31 +01:00
Shawn XuDisservinRobert Nürnberggab8192
 		99d32e395e Reapply #5909 
This version fixes the logic of `gives_check`, which was identified to
be the cause of illegal moves.

closes https://github.com/official-stockfish/Stockfish/pull/5914

No functional change

Co-authored-by: Robert Nürnberg <robert.nurnberg@gmx.de>
Co-authored-by: gab8192 <gabrilomba57@gmail.com>
 2025-03-21 11:02:19 +01:00
Shawn XuandDisservin 09faa62621 Simplify NMP Conditions 
Passed Non-regression STC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 142400 W: 36883 L: 36779 D: 68738
Ptnml(0-2): 467, 16804, 36571, 16874, 484
https://tests.stockfishchess.org/tests/view/67bd1898e4a8d7152b974ef1

Passed Non-regression LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 251868 W: 63905 L: 63920 D: 124043
Ptnml(0-2): 133, 27480, 70708, 27495, 118
https://tests.stockfishchess.org/tests/view/67bd1898e4a8d7152b974ef1

closes https://github.com/official-stockfish/Stockfish/pull/5906

Bench: 2188400
 2025-02-27 20:31:04 +01:00
Shawn XuandDisservin 43b2d65d72 Add scaling note to futility pruning 
Note that both patches below effectively reduces the frequency of futility pruning.

Passed STC:
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 51680 W: 13599 L: 13253 D: 24828
Ptnml(0-2): 217, 6056, 12959, 6380, 228
https://tests.stockfishchess.org/tests/view/67ac218fa04df5eb8dbebf26

Passed LTC:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 51798 W: 13338 L: 12986 D: 25474
Ptnml(0-2): 42, 5584, 14310, 5906, 57
https://tests.stockfishchess.org/tests/view/67acf04152879dfd14d7e846

Regression at STC SMP:
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 231552 W: 60226 L: 59642 D: 111684
Ptnml(0-2): 565, 25994, 62031, 26664, 522
https://tests.stockfishchess.org/tests/view/67ae390c1a4c73ae1f930dbf

Passed STC:
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 22560 W: 6022 L: 5725 D: 10813
Ptnml(0-2): 87, 2524, 5762, 2819, 88
https://tests.stockfishchess.org/tests/view/67ac202aa04df5eb8dbebf22

Passed LTC:
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 66138 W: 16953 L: 16572 D: 32613
Ptnml(0-2): 62, 7103, 18360, 7480, 64
https://tests.stockfishchess.org/tests/view/67ad47d852879dfd14d7e899

Regression at VVLTC SMP:
LLR: -2.94 (-2.94,2.94) <-1.75,0.25>
Total: 29138 W: 7408 L: 7655 D: 14075
Ptnml(0-2): 0, 2816, 9189, 2559, 5
https://tests.stockfishchess.org/tests/view/67b159ce6c6b9e172ad1598f

closes https://github.com/official-stockfish/Stockfish/pull/5888

No functional change
 2025-02-24 19:09:52 +01:00
Shawn XuandJoost VandeVondele d66e603070 Increase PCM bonus when cutOffCnt is low 
Passed STC:
LLR: 2.95 (-2.94,2.94) <0.00,2.00>
Total: 36832 W: 9763 L: 9438 D: 17631
Ptnml(0-2): 159, 4267, 9254, 4562, 174
https://tests.stockfishchess.org/tests/view/67a29dbafedef70e42ac329a

Passed LTC:
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 19728 W: 5124 L: 4839 D: 9765
Ptnml(0-2): 18, 2029, 5485, 2314, 18
https://tests.stockfishchess.org/tests/view/67a2a1abfedef70e42ac32b7

closes https://github.com/official-stockfish/Stockfish/pull/5865

Bench: 3197798
 2025-02-05 19:00:25 +01:00
Shawn XuandDisservin 8c73472ac8 Simplify depth increase condition further 
Passed Non-regression STC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 51232 W: 13560 L: 13351 D: 24321
Ptnml(0-2): 183, 6075, 12920, 6226, 212
https://tests.stockfishchess.org/tests/view/679d7b2b0774dfd78deb043f

Passed Non-regression LTC (v. #5827):
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 172398 W: 44108 L: 44042 D: 84248
Ptnml(0-2): 122, 19207, 47489, 19245, 136
https://tests.stockfishchess.org/tests/view/679d7fb10774dfd78deb05d2

Passed Non-regression VLTC (v. #5827):
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 388540 W: 99314 L: 99464 D: 189762
Ptnml(0-2): 89, 40454, 113350, 40272, 105
https://tests.stockfishchess.org/tests/view/679da3be0774dfd78deb0ad4

closes https://github.com/official-stockfish/Stockfish/pull/5846

Bench: 2688175
 2025-02-04 21:11:37 +01:00
Shawn XuandDisservin 344e89275a Simplify Away Quadruple Extensions 
Passed Non-regression LTC:
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 95856 W: 24551 L: 24404 D: 46901
Ptnml(0-2): 85, 10621, 26364, 10778, 80
https://tests.stockfishchess.org/tests/view/679a9aedae346be6da0eebd6

Passed Non-regression VLTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 157536 W: 40000 L: 39921 D: 77615
Ptnml(0-2): 43, 16416, 45775, 16487, 47
https://tests.stockfishchess.org/tests/view/679aed8f51037ccaf3e30fbf

Passed Non-regression VVLTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 51598 W: 13345 L: 13172 D: 25081
Ptnml(0-2): 0, 4735, 16162, 4896, 6
https://tests.stockfishchess.org/tests/view/679d368b0774dfd78deb0163

closes https://github.com/official-stockfish/Stockfish/pull/5843

Bench: 2399312
 2025-02-02 13:44:22 +01:00
Shawn XuandDisservin 4a77fb213f Clean up corrhist 
Passed Non-regression STC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 89056 W: 23225 L: 23067 D: 42764
Ptnml(0-2): 292, 9688, 24470, 9726, 352
https://tests.stockfishchess.org/tests/view/679816b2ae346be6da0ee8e7

closes https://github.com/official-stockfish/Stockfish/pull/5830

Bench: 1767398
 2025-02-02 13:33:35 +01:00
Shawn XuJoost VandeVondeleAndrew Grant
 		889fed448c Better nonpawn indexing 
Improves indexing scheme, by noting that both sides are likely to access the same non_pawn_index nearby.

LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 75936 W: 19905 L: 19554 D: 36477
Ptnml(0-2): 190, 7863, 21554, 8128, 233
https://tests.stockfishchess.org/tests/view/67904d0cfc8c306ba6cea332

closes https://github.com/official-stockfish/Stockfish/pull/5816

No functional change

Co-authored-by: Andrew Grant <andrew.github@grantnet.us>
 2025-01-25 20:53:53 +01:00
Shawn XuandJoost VandeVondele d606311e55 Fix undefined behavior 
From cppreference: "It is undefined behavior to read from the member of the
union that wasn't most recently written. Many compilers implement, as a
non-standard language extension, the ability to read inactive members of a
union."

closes https://github.com/official-stockfish/Stockfish/pull/5811

no functional change
 2025-01-25 20:33:43 +01:00
Shawn XuandJoost VandeVondele e7367cef0f Clean up pack reordering 
closes https://github.com/official-stockfish/Stockfish/pull/5802

no functional change
 2025-01-25 20:17:39 +01:00
Shawn XuandJoost VandeVondele 62ecdfe82c simplify accumulator updates 
After #5759 accumulator updates are strictly on a per-move basis. Therefore, the generic code for updating multiple moves at once is no longer needed.

Passed Non-regression STC:
LLR: 3.00 (-2.94,2.94) <-1.75,0.25>
Total: 81696 W: 21204 L: 21039 D: 39453
Ptnml(0-2): 210, 8431, 23416, 8566, 225
https://tests.stockfishchess.org/tests/view/67823a24a31c4c13e83518a8

closes https://github.com/official-stockfish/Stockfish/pull/5760

no functional change
 2025-01-25 20:09:09 +01:00
Shawn XuandJoost VandeVondele 738ac2a100 tuned TM values 
Tuned 70k games at 240+2.4 th 2: https://tests.stockfishchess.org/tests/view/6783b1b16ddf09c0b4b703f5

Failed STC:
LLR: -2.93 (-2.94,2.94) <0.00,2.00>
Total: 491872 W: 128260 L: 127804 D: 235808
Ptnml(0-2): 1579, 55449, 131572, 55609, 1727
https://tests.stockfishchess.org/tests/view/6785a045460e2910c51de4b8

Passed LTC:
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 154824 W: 39315 L: 38874 D: 76635
Ptnml(0-2): 110, 15809, 45147, 16222, 124
https://tests.stockfishchess.org/tests/view/678ac722c00c743bc9e9fc35

Passed VLTC:
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 77404 W: 19825 L: 19452 D: 38127
Ptnml(0-2): 18, 7262, 23765, 7643, 14
https://tests.stockfishchess.org/tests/view/678b2a98c00c743bc9ea048c

closes https://github.com/official-stockfish/Stockfish/pull/5796

No functional change
 2025-01-18 21:24:01 +01:00
Shawn XuandJoost VandeVondele ccbd060b01 simplify razoring 
Passed Non-regression STC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 93056 W: 24215 L: 24054 D: 44787
Ptnml(0-2): 364, 11085, 23470, 11244, 365
https://tests.stockfishchess.org/tests/view/67883a5d3b8f206a2696b804

Passed Non-regression LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 66564 W: 16971 L: 16794 D: 32799
Ptnml(0-2): 56, 7403, 18192, 7570, 61
https://tests.stockfishchess.org/tests/view/6789ffa78082388fa0cbfe95

closes https://github.com/official-stockfish/Stockfish/pull/5788

bench 1500649
 2025-01-18 20:54:55 +01:00
Shawn XuandDisservin 921361829a Simplify away capthist bonus in Probcut 
The explicit bonus has been obsoleted with the introduction of #5695

Passed Non-regression STC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 132832 W: 34519 L: 34403 D: 63910
Ptnml(0-2): 430, 15754, 33931, 15872, 429
https://tests.stockfishchess.org/tests/view/678158c49168c8bf30927834

Passed Non-regression LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 123492 W: 31426 L: 31309 D: 60757
Ptnml(0-2): 79, 13705, 34051, 13842, 69
https://tests.stockfishchess.org/tests/view/6782b07e6ddf09c0b4b6dbb7

closes https://github.com/official-stockfish/Stockfish/pull/5761

Bench: 1180439
 2025-01-12 21:23:29 +01:00
Shawn XuandDisservin 8d517bddff Simplify accumulator updates 
AMD Ryzen 5 7600X
```
sf_base =  1902646 +/-   2114 (95%)
sf_test =  1920873 +/-   2515 (95%)
diff    =    18227 +/-   3067 (95%)
speedup = 0.95800% +/- 0.161% (95%)
```

Ryzen 9 5950X
```
sf_base =  1413387 +/-   3592 (95%)
sf_test =  1437893 +/-   3355 (95%)
diff    =    24505 +/-   4669 (95%)
speedup = 1.73380% +/- 0.330% (95%)
```

Intel Core i7-6700K
```
sf_base =   912476 +/-   1863 (95%)
sf_test =   921864 +/-   2042 (95%)
diff    =     9388 +/-   3333 (95%)
speedup = 1.02893% +/- 0.365% (95%)
```

Raspberry Pi 5
```
sf_base =   260993 +/-   1508 (95%)
sf_test =   262912 +/-   1746 (95%)
diff    =     1918 +/-   1221 (95%)
speedup = 0.73504% +/- 0.468% (95%)
```

Passed Non-regression STC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 23072 W: 6041 L: 5813 D: 11218
Ptnml(0-2): 61, 2435, 6319, 2657, 64
https://tests.stockfishchess.org/tests/view/6780a0ca9168c8bf30927757

closes https://github.com/official-stockfish/Stockfish/pull/5759

No functional change
 2025-01-12 21:21:53 +01:00
Shawn XuandDisservin 28c07fb456 Simplify Probcut Condition 
Rebased and properly guarded #5720

Passed Non-regression STC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 179616 W: 45764 L: 45706 D: 88146
Ptnml(0-2): 125, 19665, 50162, 19739, 117
https://tests.stockfishchess.org/tests/view/677590531a2f267f20548b82

Passed Non-regression LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 445728 W: 113467 L: 113682 D: 218579
Ptnml(0-2): 331, 49226, 123900, 49141, 266
https://tests.stockfishchess.org/tests/view/67734f351a2f267f205489d9

closes https://github.com/official-stockfish/Stockfish/pull/5758

Bench: 1180421
 2025-01-12 21:18:39 +01:00
Shawn XuandDisservin 403a5e100b Simplify Fail-Low Bonus 
Passed Non-regression STC:
LLR: 2.92 (-2.94,2.94) <-1.75,0.25>
Total: 66592 W: 17426 L: 17239 D: 31927
Ptnml(0-2): 208, 7812, 17109, 7919, 248
https://tests.stockfishchess.org/tests/view/6774e1711a2f267f20548b22

Passed Non-regression LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 179616 W: 45764 L: 45706 D: 88146
Ptnml(0-2): 125, 19665, 50162, 19739, 117
https://tests.stockfishchess.org/tests/view/677590531a2f267f20548b82

closes https://github.com/official-stockfish/Stockfish/pull/5751

Bench: 1310158
 2025-01-12 21:14:11 +01:00
Shawn XuandDisservin 5370c3035e Refactor Stats Array 
* Limit use of `StatsEntry` wrapper to arithmetic types
* Generalize `Stats` to `MultiArray` by discarding the template parameter `D`
* Allow `MultiArray::fill` to take any type assignable to element type
* Remove now-unused operator overloads on `StatsEntry`

closes https://github.com/official-stockfish/Stockfish/pull/5750

No functional change
 2025-01-12 21:13:14 +01:00
Shawn XuandDisservin c47e6fcf84 Small cleanup of nnue_feature_transformer.h 
Passed Non-regression STC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 285760 W: 73716 L: 73768 D: 138276
Ptnml(0-2): 777, 30775, 79851, 30677, 800
https://tests.stockfishchess.org/tests/view/676f78681a2f267f205485aa

closes https://github.com/official-stockfish/Stockfish/pull/5745

No functional change
 2025-01-12 21:11:59 +01:00
Shawn XuandDisservin d1a1ff4f17 Simplify Razoring 
Passed Non-regression STC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 95584 W: 24906 L: 24750 D: 45928
Ptnml(0-2): 285, 11227, 24632, 11343, 305
https://tests.stockfishchess.org/tests/view/675e0ed286d5ee47d95429ee

Passed Non-regression LTC:
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 191292 W: 48637 L: 48589 D: 94066
Ptnml(0-2): 97, 21061, 53276, 21121, 91
https://tests.stockfishchess.org/tests/view/675f08c686d5ee47d9542be3

closes https://github.com/official-stockfish/Stockfish/pull/5724

Bench: 1286274
 2025-01-12 21:11:27 +01:00
Shawn XuandDisservin 5488dd2f91 Update Copyright Year 
closes https://github.com/official-stockfish/Stockfish/pull/5747

No functional change
 2025-01-06 00:45:28 +01:00
Shawn XuandDisservin 00da3ff463 Cleanup stats entry 
Prevents potential issue caused by publicly inheriting from STL container types

closes https://github.com/official-stockfish/Stockfish/pull/5746

No functional change
 2025-01-06 00:44:25 +01:00
Shawn XuandDisservin 5cf6f99177 Remove some incorrectly marked const qualifiers 
closes https://github.com/official-stockfish/Stockfish/pull/5744

No functional change
 2025-01-06 00:43:49 +01:00
Shawn XuandDisservin 78b5733939 Simplify post-lmr conthist bonus 
Passed Non-regression STC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 49184 W: 12735 L: 12528 D: 23921
Ptnml(0-2): 134, 5746, 12647, 5909, 156
https://tests.stockfishchess.org/tests/view/6765cd2e86d5ee47d954420e

Passed Non-regression LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 177270 W: 45227 L: 45166 D: 86877
Ptnml(0-2): 132, 19498, 49302, 19583, 120
https://tests.stockfishchess.org/tests/view/676721fd86d5ee47d9544489

closes https://github.com/official-stockfish/Stockfish/pull/5734

Bench: 1042099
 2025-01-06 00:43:37 +01:00
Shawn XuandDisservin e7e78aa09e Adjust LMR with correction history 
A positive constant increase in base reduction is applied to counter the
decrease in average reduction from this tweak.

Passed STC:
LLR: 2.98 (-2.94,2.94) <0.00,2.00>
Total: 109216 W: 28415 L: 27989 D: 52812
Ptnml(0-2): 310, 12848, 27911, 13184, 355
https://tests.stockfishchess.org/tests/view/6760bb0e86d5ee47d9542f26

Passed LTC:
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 66918 W: 17073 L: 16694 D: 33151
Ptnml(0-2): 33, 7175, 18666, 7550, 35
https://tests.stockfishchess.org/tests/view/6761e10f86d5ee47d95431fa

closes https://github.com/official-stockfish/Stockfish/pull/5727

Bench: 1294909
 2024-12-22 15:26:39 +01:00
Shawn XuandDisservin 6075e787d0 Add CI test with glibcxx assertions enabled 
Re: https://github.com/official-stockfish/Stockfish/pull/5721#pullrequestreview-2504542601

closes https://github.com/official-stockfish/Stockfish/pull/5723

No functional change
 2024-12-22 15:20:25 +01:00
Shawn XuandDisservin 77ec878ffa Prevent out of bounds access of dbg info arrays 
closes https://github.com/official-stockfish/Stockfish/pull/5721

No functional change
 2024-12-22 15:19:13 +01:00
Shawn XuandDisservin e770b55f7f Remove Extraneous Parenthesis 
No longer needed after
https://github.com/official-stockfish/Stockfish/pull/5667.

closes https://github.com/official-stockfish/Stockfish/pull/5717

No functional change
 2024-12-22 15:17:33 +01:00
Shawn XuandDisservin b822fdf2f2 Tune histories 
Passed STC:
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 268736 W: 70080 L: 69421 D: 129235
Ptnml(0-2): 831, 31795, 68460, 32448, 834
https://tests.stockfishchess.org/tests/view/6750778886d5ee47d9540e7c

Passed LTC:
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 505356 W: 129145 L: 127868 D: 248343
Ptnml(0-2): 307, 54901, 140959, 56230, 281
https://tests.stockfishchess.org/tests/view/675367de86d5ee47d9541536

closes https://github.com/official-stockfish/Stockfish/pull/5712

Bench: 1148169
 2024-12-22 15:14:22 +01:00
Shawn XuandDisservin 6a8478c6ad Simplify Prior Capture Countermove Bonus 
Passed Non-regression STC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 184032 W: 47626 L: 47568 D: 88838
Ptnml(0-2): 590, 21808, 47238, 21714, 666
https://tests.stockfishchess.org/tests/view/67412c7686d5ee47d953f743

Passed Non-regression LTC:
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 169218 W: 43395 L: 43323 D: 82500
Ptnml(0-2): 302, 18567, 46791, 18655, 294
https://tests.stockfishchess.org/tests/view/6743b7e086d5ee47d953f9a6

closes https://github.com/official-stockfish/Stockfish/pull/5701

Bench: 1130692
 2024-12-08 19:55:10 +01:00
Shawn XuandDisservin b7f17346e5 Fix Sanitizer Tests 
closes https://github.com/official-stockfish/Stockfish/pull/5692

No functional change
 2024-11-22 23:41:34 +01:00
Shawn XuandDisservin 4fcd78ceb4 Simplify Probcut Bonus 
Passed STC:
LLR: 2.99 (-2.94,2.94) <-1.75,0.25>
Total: 172288 W: 44656 L: 44580 D: 83052
Ptnml(0-2): 507, 20650, 43782, 20670, 535
https://tests.stockfishchess.org/tests/view/673b74f986d5ee47d953f1a3

Passed LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 94596 W: 24098 L: 23953 D: 46545
Ptnml(0-2): 57, 10322, 26393, 10471, 55
https://tests.stockfishchess.org/tests/view/673d191886d5ee47d953f337

closes https://github.com/official-stockfish/Stockfish/pull/5688

Bench: 1031022
 2024-11-22 23:31:34 +01:00