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Author SHA1 Message Date
Shawn XuandDisservin 6a8478c6ad Simplify Prior Capture Countermove Bonus 
Passed Non-regression STC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 184032 W: 47626 L: 47568 D: 88838
Ptnml(0-2): 590, 21808, 47238, 21714, 666
https://tests.stockfishchess.org/tests/view/67412c7686d5ee47d953f743

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

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

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

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

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

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

Bench: 1031022
 2024-11-22 23:31:34 +01:00
Shawn XuandDisservin cc5c67c564 Introduce Fractional LMR 
Tuning Run (90k Games):
https://tests.stockfishchess.org/tests/view/67202b1c86d5ee47d953d442

Passed STC:
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 241024 W: 62616 L: 62001 D: 116407
Ptnml(0-2): 716, 28231, 62015, 28822, 728
https://tests.stockfishchess.org/tests/view/6725196786d5ee47d953d9f2

Passed LTC:
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 92532 W: 23678 L: 23246 D: 45608
Ptnml(0-2): 45, 9981, 25797, 10383, 60
https://tests.stockfishchess.org/tests/view/6727d3cb86d5ee47d953db9d

closes https://github.com/official-stockfish/Stockfish/pull/5667

Bench: 1066071
 2024-11-13 20:12:47 +01:00
Shawn XuandDisservin c2611efe5c Move history code to a separate header 
Since no correction histories are ever used inside Movepick, and many
existing histories are closely integrated into search, it might be more
logical to separate them into their own header. PR based on #5650

closes https://github.com/official-stockfish/Stockfish/pull/5652

No functional change
 2024-11-13 20:07:15 +01:00
Shawn XuandDisservin 4a9c980f3b Template Corrhist 
Avoids duplication of `using ... = Stats<int16_t,
CORRECTION_HISTORY_LIMIT, COLOR_NB, CORRECTION_HISTORY_SIZE>;`

closes https://github.com/official-stockfish/Stockfish/pull/5650

No functional change

Co-authored-by: Disservin <disservin.social@gmail.com>
 2024-10-31 09:27:12 +01:00
Shawn XuandDisservin b261df970d Fix majorPieceKey Updates 
Passed STC:
LLR: 2.98 (-2.94,2.94) <0.00,2.00>
Total: 476160 W: 124285 L: 123311 D: 228564
Ptnml(0-2): 1662, 56266, 121219, 57302, 1631
https://tests.stockfishchess.org/tests/view/66ea3dc186d5ee47d953ae07

Failed Yellow LTC:
LLR: -2.94 (-2.94,2.94) <0.50,2.50>
Total: 230634 W: 58525 L: 58295 D: 113814
Ptnml(0-2): 113, 25301, 64299, 25451, 153
https://tests.stockfishchess.org/tests/view/66f1825e86d5ee47d953b2ec

Passed Non-regression LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 112344 W: 28590 L: 28462 D: 55292
Ptnml(0-2): 71, 12439, 31039, 12537, 86
https://tests.stockfishchess.org/tests/view/6707474486d5ee47d953bfe3

closes https://github.com/official-stockfish/Stockfish/pull/5629

Bench: 1283457
 2024-10-12 16:40:49 +02:00
Shawn XuandJoost VandeVondele d6043970bd Make Correction History Size Uniform 
Passed Non-regression STC:
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 207232 W: 53834 L: 53802 D: 99596
Ptnml(0-2): 695, 24486, 53200, 24562, 673
https://tests.stockfishchess.org/tests/view/66e9f5a886d5ee47d953ada1

Passed Non-regression LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 99120 W: 25264 L: 25123 D: 48733
Ptnml(0-2): 66, 10803, 27675, 10956, 60
https://tests.stockfishchess.org/tests/view/66ed7ebc86d5ee47d953b056

Passed Non-regression LTC vs #5606:
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 208950 W: 53049 L: 53019 D: 102882
Ptnml(0-2): 111, 23232, 57760, 23260, 112
https://tests.stockfishchess.org/tests/view/66f1843886d5ee47d953b2f2

closes https://github.com/official-stockfish/Stockfish/pull/5609

bench 1575189
 2024-09-28 18:01:31 +02:00
Shawn XuandDisservin 60351b9df9 Introduce Various Correction histories 
This patch introduces three additional correction histories, namely,
Major Piece Correction History, Minor Piece Correction History, and
Non-Pawn Correction History.

Introduced by @mcthouacbb in Sirius
(https://github.com/mcthouacbb/Sirius) chess engine. The Major Piece
Correction History is indexed by side-to-move and the Zobrist key
representing the position of the King, Rook, and Queen of both sides.
Likewise, the Minor Piece Correction History is indexed by side-to-move
and the Zobrist key representing the position of the King, Knight, and
Bishop of both sides.

Also See:
https://github.com/mcthouacbb/Sirius/commit/97b85bbaac88ff5a0f63e28776027dd3de77164e
https://github.com/mcthouacbb/Sirius/commit/3099cdef2f13e29805654b5f8153e6ecd5853195

Introduced by @zzzzz151 in Starzix (https://github.com/zzzzz151/Starzix)
chess engine. Non-Pawn correction history consists of side-to-move, side
of Zobrist key, and a Zobrist key representing of the position of all
non-pawn pieces of **one side**. The non-pawn correction values for both
key sides are then summed.

Also See:
https://github.com/zzzzz151/Starzix/commit/34911772f178c27b3a239dda0acb79c397c3a2f0
https://github.com/zzzzz151/Starzix/commit/33e0df8dd2db1d4775974ab12e3390154697f47a

The weights on the final correction value of the above correction
histories, as well as existing correction histories, are then tuned in
two separate SPSA sessions, totaling 75k games.

SPSA1:
https://tests.stockfishchess.org/tests/view/66e5243886d5ee47d953a86b
(Stopped early due to some weights reaching the maximum value)

SPSA2:
https://tests.stockfishchess.org/tests/view/66e6a26f86d5ee47d953a965

Also thanks to @martinnovaak, (Motor
https://github.com/martinnovaak/motor author) for insights and
suggestions.

Passed STC:
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 23328 W: 6197 L: 5901 D: 11230
Ptnml(0-2): 82, 2582, 6041, 2876, 83
https://tests.stockfishchess.org/tests/view/66e8787b86d5ee47d953ab6f

Passed LTC:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 10626 W: 2826 L: 2560 D: 5240
Ptnml(0-2): 4, 1054, 2941, 1300, 14
https://tests.stockfishchess.org/tests/view/66e8ab2386d5ee47d953aba8

closes https://github.com/official-stockfish/Stockfish/pull/5598

Bench: 1011161
 2024-09-17 21:01:43 +02:00
Shawn XuandDisservin 5ce7f866a5 Simplify Fail Low Bonus 
Passed Non-regression STC:
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 302528 W: 78190 L: 78264 D: 146074
Ptnml(0-2): 1029, 35797, 77551, 35993, 894
https://tests.stockfishchess.org/tests/view/66dcebdedc53972b68218c7e

Passed Non-regression LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 122754 W: 31025 L: 30907 D: 60822
Ptnml(0-2): 74, 13597, 33908, 13733, 65
https://tests.stockfishchess.org/tests/view/66e0c38686d5ee47d953a481

closes https://github.com/official-stockfish/Stockfish/pull/5594

Bench: 1646373
 2024-09-17 20:50:30 +02:00
Shawn XuandDisservin ddc9f48bc3 Introduce Material Correction History 
Idea from Caissa (https://github.com/Witek902/Caissa) chess engine.

Add a secondary correction history indexed by the material key of a position.
The material key is the zobrist hash representing the number of pieces left in a
position.

Passed STC:
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 189472 W: 49360 L: 48813 D: 91299
Ptnml(0-2): 666, 22453, 47953, 22996, 668
https://tests.stockfishchess.org/tests/view/66cbddafbf8c9d8780fda9f1

Passed LTC:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 224190 W: 57022 L: 56312 D: 110856
Ptnml(0-2): 197, 24723, 61540, 25443, 192
https://tests.stockfishchess.org/tests/view/66cd529bbf8c9d8780fdab4c

closes https://github.com/official-stockfish/Stockfish/pull/5556

Bench: 1462697
 2024-09-09 17:43:05 +02:00
Shawn XuandJoost VandeVondele d275bf9643 Introduce Fail Low History Bonus 
When a node fails low, give TT move a small bonus 1/4 of normal value.

Passed STC:
LLR: 2.95 (-2.94,2.94) <0.00,2.00>
Total: 92384 W: 24094 L: 23691 D: 44599
Ptnml(0-2): 323, 10852, 23465, 11203, 349
https://tests.stockfishchess.org/tests/view/66be80794ff211be9d4eed68

Passed LTC:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 114660 W: 29260 L: 28778 D: 56622
Ptnml(0-2): 97, 12506, 31653, 12966, 108
https://tests.stockfishchess.org/tests/view/66bf63ee4ff211be9d4eeef0

closes https://github.com/official-stockfish/Stockfish/pull/5539

bench 1463003
 2024-08-20 21:34:19 +02:00
Shawn XuandJoost VandeVondele 87814d2fb8 Simplify doShallowerSearch 
Passed Non-regression STC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 242336 W: 62657 L: 62663 D: 117016
Ptnml(0-2): 941, 28949, 61418, 28895, 965
https://tests.stockfishchess.org/tests/view/66bc13c34ff211be9d4ee794

Passed Non-regression LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 128100 W: 32503 L: 32390 D: 63207
Ptnml(0-2): 106, 14319, 35113, 14380, 132
https://tests.stockfishchess.org/tests/view/66bdbb304ff211be9d4eec5d

closes https://github.com/official-stockfish/Stockfish/pull/5537

bench 1586246
 2024-08-20 21:27:58 +02:00
Shawn XuandJoost VandeVondele 175021721c Simplify bestMove promotion 
Passed Non-regression STC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 216768 W: 56240 L: 56217 D: 104311
Ptnml(0-2): 794, 24900, 56956, 24957, 777
https://tests.stockfishchess.org/tests/view/66bc11324ff211be9d4ee78b

Passed Non-regression LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 44970 W: 11391 L: 11199 D: 22380
Ptnml(0-2): 44, 4596, 13002, 4810, 33
https://tests.stockfishchess.org/tests/view/66bdbb1b4ff211be9d4eec5a

closes https://github.com/official-stockfish/Stockfish/pull/5535

bench: 1613043
 2024-08-20 21:24:04 +02:00
Shawn XuandJoost VandeVondele a75717ede1 Simplify Post-LMR Continuation History Updates 
Passed Non-regression STC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 55520 W: 14625 L: 14420 D: 26475
Ptnml(0-2): 247, 6522, 14007, 6747, 237
https://tests.stockfishchess.org/tests/view/66ad40874ff211be9d4ed8f7

Passed Non-regression LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 216168 W: 54561 L: 54540 D: 107067
Ptnml(0-2): 196, 24212, 59244, 24239, 193
https://tests.stockfishchess.org/tests/view/66aeac954ff211be9d4eda03

closes https://github.com/official-stockfish/Stockfish/pull/5530

bench 1418263
 2024-08-20 20:51:39 +02:00
Shawn XuandJoost VandeVondele bc80ece6c7 Improve Comments for Pairwise Multiplication Optimization 
closes https://github.com/official-stockfish/Stockfish/pull/5524

no functional change
 2024-08-20 20:47:46 +02:00
Shawn XuandJoost VandeVondele ae9e55cf53 Simplify Cutnode Reduction 
Passed Non-regression STC:
LR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 143968 W: 37439 L: 37333 D: 69196
Ptnml(0-2): 521, 17228, 36456, 17182, 597
https://tests.stockfishchess.org/tests/view/66a73f9f4ff211be9d4ed27f

Passed Non-regression LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 198954 W: 50384 L: 50345 D: 98225
Ptnml(0-2): 201, 22360, 54347, 22337, 232
https://tests.stockfishchess.org/tests/view/66a906e94ff211be9d4ed423

closes https://github.com/official-stockfish/Stockfish/pull/5526

bench 1277466
 2024-08-03 09:42:54 +02:00
Shawn XuandDisservin 2343f71f3f Remove Killers 
The removal of killers on line 1774 resulted in a substantial decrease
in pre-LMR history average, so a negative history fill is applied to
counter it.

Passed Non-regression STC (vs #5513):
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 21984 W: 5886 L: 5645 D: 10453
Ptnml(0-2): 80, 2492, 5628, 2691, 101
https://tests.stockfishchess.org/tests/view/66a095894ff211be9d4ecb9d

Passed Non-regression LTC (vs #5513):
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 95430 W: 24141 L: 23995 D: 47294
Ptnml(0-2): 97, 10537, 26298, 10689, 94
https://tests.stockfishchess.org/tests/view/66a11c8d4ff211be9d4ecbf8

closes https://github.com/official-stockfish/Stockfish/pull/5517

Bench: 1660869
 2024-07-28 22:22:50 +02:00
Shawn XuandDisservin 85893ac1cd Simplify Away Killer Condition in Cutnode LMR 
Passed Non-regression STC:
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 42944 W: 11240 L: 11024 D: 20680
Ptnml(0-2): 159, 5056, 10825, 5274, 158
https://tests.stockfishchess.org/tests/view/669c13384ff211be9d4ec69f

Passed Non-regression LTC:
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 163548 W: 41366 L: 41289 D: 80893
Ptnml(0-2): 109, 18246, 45007, 18283, 129
https://tests.stockfishchess.org/tests/view/669cb1254ff211be9d4ec73a

closes https://github.com/official-stockfish/Stockfish/pull/5513

Bench: 1178570
 2024-07-28 22:13:47 +02:00
Shawn XuandJoost VandeVondele 985b9fd7b0 Remove Killer Heuristic In Move Ordering 
Passed Non-regression STC:
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 80480 W: 20979 L: 20802 D: 38699
Ptnml(0-2): 279, 9610, 20337, 9683, 331
https://tests.stockfishchess.org/tests/view/669c12c14ff211be9d4ec69b

Passed Non-regression LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 77988 W: 19788 L: 19624 D: 38576
Ptnml(0-2): 66, 8605, 21481, 8783, 59
https://tests.stockfishchess.org/tests/view/669d628a4ff211be9d4ec7a8

closes https://github.com/official-stockfish/Stockfish/pull/5511

bench 1367740
 2024-07-23 19:24:00 +02:00
Shawn XuandJoost VandeVondele 024eb6f453 Unify Movepick Initializer 
Passed Non-regression STC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 168704 W: 43524 L: 43455 D: 81725
Ptnml(0-2): 414, 17173, 49076, 17308, 381
https://tests.stockfishchess.org/tests/view/66904b7b5034141ae599a197

Passed Non-regression LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 120294 W: 30473 L: 30364 D: 59457
Ptnml(0-2): 40, 10974, 38032, 11039, 62
https://tests.stockfishchess.org/tests/view/66905b235034141ae599a223

closes https://github.com/official-stockfish/Stockfish/pull/5477

bench 1459677
 2024-07-15 13:18:37 +02:00
Shawn XuandJoost VandeVondele 3df09c04d7 Simplify Away Refutation Stage 
Simplify away killer stage to a constant bonus given to the killer move during
quiet move scoring.

Passed Non-regression STC (Against then-pending PR #5472):
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 106176 W: 27685 L: 27539 D: 50952
Ptnml(0-2): 410, 12765, 26637, 12821, 455
https://tests.stockfishchess.org/tests/view/668dd0835034141ae5999e8f

Passed Non-regression LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 92472 W: 23426 L: 23276 D: 45770
Ptnml(0-2): 55, 10376, 25215, 10544, 46
https://tests.stockfishchess.org/tests/view/669019e45034141ae5999fd2

closes https://github.com/official-stockfish/Stockfish/pull/5476

Bench 1459677
 2024-07-15 13:15:35 +02:00
Shawn XuandJoost VandeVondele 4880ed4ad1 Simplify Probcut Malus 
Passed Non-regression STC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 74880 W: 19261 L: 19083 D: 36536
Ptnml(0-2): 202, 8861, 19120, 9071, 186
https://tests.stockfishchess.org/tests/view/668a0966eca84f4d25864cba

Passed Non-regression LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 263916 W: 66690 L: 66718 D: 130508
Ptnml(0-2): 125, 29348, 73040, 29320, 125
https://tests.stockfishchess.org/tests/view/668a17e3eca84f4d25864e91

closes https://github.com/official-stockfish/Stockfish/pull/5464

bench 1331408
 2024-07-09 18:44:39 +02:00
Shawn XuandJoost VandeVondele 2d3ef434b4 Tweak LMR at Root 
Passed STC:
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 328192 W: 84751 L: 84014 D: 159427
Ptnml(0-2): 758, 38802, 84253, 39511, 772
https://tests.stockfishchess.org/tests/view/6689203959cb3228a4759a49

Passed LTC:
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 56748 W: 14494 L: 14136 D: 28118
Ptnml(0-2): 19, 6089, 15803, 6441, 22
https://tests.stockfishchess.org/tests/view/66892d76e59d990b103f6626

closes https://github.com/official-stockfish/Stockfish/pull/5452

Bench 1253593
 2024-07-09 18:26:35 +02:00
Shawn XuandJoost VandeVondele b79ac764ff Simplify in-check condition for Probcut-in-check 
dont let your memes be dreams !?

Passed Non-regression STC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 512000 W: 132193 L: 132497 D: 247310
Ptnml(0-2): 1600, 61170, 130704, 60986, 1540
https://tests.stockfishchess.org/tests/view/66838911c4f539faa03268a2

Passed Non-regression LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 380268 W: 95894 L: 96042 D: 188332
Ptnml(0-2): 193, 42861, 104180, 42701, 199
https://tests.stockfishchess.org/tests/view/6688d0550c9d7c1ab33ed5a8

closes https://github.com/official-stockfish/Stockfish/pull/5443

Bench: 1130282
 2024-07-09 18:24:40 +02:00
Shawn XuandJoost VandeVondele b1f522930d Simplify Away Move Count Pruning Adjustment 
Using Singular Search Result

Passed Non-regression STC:
LLR: 3.01 (-2.94,2.94) <-1.75,0.25>
Total: 62688 W: 16319 L: 16121 D: 30248
Ptnml(0-2): 196, 7317, 16104, 7547, 180
https://tests.stockfishchess.org/tests/view/66879bf51b527f04dd477ff9

Passed Non-regression LTC:
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 116502 W: 29504 L: 29379 D: 57619
Ptnml(0-2): 66, 12881, 32226, 13018, 60
https://tests.stockfishchess.org/tests/view/6688629e0c9d7c1ab33ed030

closes https://github.com/official-stockfish/Stockfish/pull/5442

bench 1207930
 2024-07-09 18:20:26 +02:00
Shawn XuandJoost VandeVondele 24ab46c511 Non-functional Fixes & Updates 
Fixes a missing default slot for dbg_extremes of, removes a extra newline, and
updates SE elo estimate from
https://tests.stockfishchess.org/tests/view/664ebd1e928b1fb18de4e4b7 while we
are at it.

closes https://github.com/official-stockfish/Stockfish/pull/5446

No functional change
 2024-07-06 17:56:31 +02:00
Shawn XuandJoost VandeVondele a45c2bc34a Simplify Away Countermove Heuristic 
Passed Non-regression STC:
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 977824 W: 252072 L: 252888 D: 472864
Ptnml(0-2): 2518, 117120, 250560, 116088, 2626
https://tests.stockfishchess.org/tests/view/6683452d95b0d1e881e81541

Passed Non-regression LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 81048 W: 20630 L: 20470 D: 39948
Ptnml(0-2): 36, 8915, 22464, 9071, 38
https://tests.stockfishchess.org/tests/view/66886b7b0c9d7c1ab33ed281

closes https://github.com/official-stockfish/Stockfish/pull/5441

bench 1276784
 2024-07-06 17:48:11 +02:00
Shawn XuandJoost VandeVondele b9ff5bb93b Implement dbg_extremes_of 
An alternative to #5431, implements one function `dbg_extremes_of` to keep track
of min and max.

closes https://github.com/official-stockfish/Stockfish/pull/5434

No functional change
 2024-07-03 13:44:01 +02:00
Shawn XuandJoost VandeVondele 69ad4667fb Do Capture History Updates In Probcut 
This patch introduces history updates to probcut. Standard depth - 3 bonus and
maluses are given to the capture that caused fail high and previously searched
captures, respectively. Similar to #5243, a negative history fill is applied to
compensate for an increase in capture history average, thus improving the
scaling of this patch.

Passed STC:
LLR: 2.95 (-2.94,2.94) <0.00,2.00>
Total: 84832 W: 21941 L: 21556 D: 41335
Ptnml(0-2): 226, 9927, 21688, 10386, 189
https://tests.stockfishchess.org/tests/view/6682fab9389b9ee542b1d029

Passed LTC:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 104298 W: 26469 L: 26011 D: 51818
Ptnml(0-2): 43, 11458, 28677, 11940, 31
https://tests.stockfishchess.org/tests/view/6682ff06389b9ee542b1d0a0

closes https://github.com/official-stockfish/Stockfish/pull/5428

bench 1281351
 2024-07-03 13:18:00 +02:00
Shawn XuandJoost VandeVondele d5c130569b Simplify Bonus Formula In History Adjustment 
Inspired by a discord message [1] from Vizvezdenec, this patch simplifies the
bonus adjustment bonus = bonus > 0 ? 2 * bonus : bonus / 2 to a constant
addition, maintaining bonus average at around 0 in regular bench. As cj5716
pointed in discord [2], the constant bonus can also be considered as factoring
tempo when calculating bonus, yielding a better value of the move.

[1] https://discord.com/channels/435943710472011776/882956631514689597/1243877089443188776
[2] https://discord.com/channels/435943710472011776/813919248455827515/1252277437249622077

Passed Non-regression STC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 29984 W: 7908 L: 7677 D: 14399
Ptnml(0-2): 95, 3502, 7594, 3679, 122
https://tests.stockfishchess.org/tests/view/666f7210602682471b064fa2

Passed Non-regression LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 170136 W: 43214 L: 43145 D: 83777
Ptnml(0-2): 158, 19185, 46311, 19258, 156
https://tests.stockfishchess.org/tests/view/666fb32e602682471b064fb5

closes https://github.com/official-stockfish/Stockfish/pull/5401

bench 1438375
 2024-06-23 11:41:48 +02:00
Shawn XuandJoost VandeVondele 4a2291ed33 Simplify Away Quadruple Extension 
Passed non-regression VVLTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 90792 W: 23155 L: 23018 D: 44619
Ptnml(0-2): 6, 8406, 28432, 8549, 3
https://tests.stockfishchess.org/tests/view/664ffa4ca86388d5e27d8e7a

Passed non-regression VLTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 288136 W: 72608 L: 72659 D: 142869
Ptnml(0-2): 38, 30258, 83525, 30211, 36
https://tests.stockfishchess.org/tests/view/66551609a86388d5e27db9ae

closes https://github.com/official-stockfish/Stockfish/pull/5293

bench 1501735
 2024-05-30 14:16:17 +02:00
Shawn XuandDisservin ae7eef51fd Simplify Fail Low Bonus Formula 
Tested against PR #5299

Passed Non-regression STC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 76352 W: 19797 L: 19619 D: 36936
Ptnml(0-2): 236, 9017, 19509, 9161, 253
https://tests.stockfishchess.org/tests/view/66564f60a86388d5e27dd307

Passed Non-regression LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 114624 W: 28946 L: 28821 D: 56857
Ptnml(0-2): 59, 12675, 31714, 12810, 54
https://tests.stockfishchess.org/tests/view/6656543da86388d5e27dd329

closes https://github.com/official-stockfish/Stockfish/pull/5301

Bench: 1212167
 2024-05-29 19:01:50 +02:00
Shawn XuandDisservin c39b98b9e3 Simplify Away History Updates in Multicut 
Passed Non-regression STC:
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 44896 W: 11600 L: 11388 D: 21908
Ptnml(0-2): 140, 5230, 11532, 5370, 176
https://tests.stockfishchess.org/tests/view/664cee31830eb9f886616a80

Passed Non-regression LTC:
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 56832 W: 14421 L: 14234 D: 28177
Ptnml(0-2): 37, 6251, 15643, 6458, 27
https://tests.stockfishchess.org/tests/view/664cfd4e830eb9f886616aa6

closes https://github.com/official-stockfish/Stockfish/pull/5281

Bench: 1119412
 2024-05-23 21:30:33 +02:00
Shawn XuandJoost VandeVondele f27a9be29c Reduce When TTValue is Above Alpha 
Passed STC:
LLR: 2.95 (-2.94,2.94) <0.00,2.00>
Total: 53376 W: 13818 L: 13476 D: 26082
Ptnml(0-2): 156, 6212, 13626, 6522, 172
https://tests.stockfishchess.org/tests/view/664aa261830eb9f8866145e5

Passed LTC:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 393444 W: 100096 L: 99042 D: 194306
Ptnml(0-2): 191, 43516, 108248, 44582, 185
https://tests.stockfishchess.org/tests/view/664ab54f830eb9f88661463c

closes https://github.com/official-stockfish/Stockfish/pull/5276

Bench: 1024562
 2024-05-21 08:40:37 +02:00
Shawn XuandJoost VandeVondele 4edd1a389e Simplify Away Quadruple Extensions 
serendipitous gainer

Passed LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 95472 W: 24176 L: 24031 D: 47265
Ptnml(0-2): 52, 10533, 26414, 10692, 45
https://tests.stockfishchess.org/tests/live_elo/6647fa596dcff0d1d6b05efa

Passed VVLTC 70+7 th 7:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 6772 W: 1793 L: 1583 D: 3396
Ptnml(0-2): 0, 502, 2172, 712, 0
https://tests.stockfishchess.org/tests/live_elo/6648277a6dcff0d1d6b05ffb

Passed VVLTC 70+7 th 7 (2x):
https://tests.stockfishchess.org/tests/view/66484c896dcff0d1d6b0619d
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 5424 W: 1469 L: 1254 D: 2701
Ptnml(0-2): 0, 394, 1710, 607, 1

closes https://github.com/official-stockfish/Stockfish/pull/5259

Bench: 1441794
 2024-05-18 09:32:21 +02:00
Shawn XuandJoost VandeVondele 285f1d2a66 Tweak NMP Formula 
Passed STC:
LLR: 2.99 (-2.94,2.94) <0.00,2.00>
Total: 241728 W: 62440 L: 61811 D: 117477
Ptnml(0-2): 914, 28467, 61458, 29126, 899
https://tests.stockfishchess.org/tests/live_elo/6645992993ce6da3e93b5b99

Passed LTC:
LLR: 2.96 (-2.94,2.94) <0.50,2.50>
Total: 167850 W: 42620 L: 42030 D: 83200
Ptnml(0-2): 82, 18412, 46354, 18988, 89
https://tests.stockfishchess.org/tests/live_elo/6647c5726dcff0d1d6b05dd3

closes https://github.com/official-stockfish/Stockfish/pull/5257

Bench: 1636018
 2024-05-18 09:26:42 +02:00
Shawn XuandJoost VandeVondele 540545d127 simplify away quietCheckEvasions pruning 
simplifies away the pruning of quiet evasion moves in quiescent search.

Passed STC:
LLR: 2.98 (-2.94,2.94) <-1.75,0.25>
Total: 343520 W: 88356 L: 88470 D: 166694
Ptnml(0-2): 1061, 40073, 89706, 39759, 1161
https://tests.stockfishchess.org/tests/view/663c7ddfc0b75d7f7b980f3b

Passed LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 168744 W: 42454 L: 42384 D: 83906
Ptnml(0-2): 75, 18678, 46782, 18776, 61
https://tests.stockfishchess.org/tests/view/663ce34fc0b75d7f7b981ed9

closes https://github.com/official-stockfish/Stockfish/pull/5231

bench 3681552
 2024-05-13 07:16:59 +02:00
Shawn XuandJoost VandeVondele c43425b0b1 Simplify Away Negative Extension 
This patch simplifies away the negative extension applied when the value returned by the transposition table is assumed to fail low over the value of reduced search.

Passed STC:
LLR: 2.99 (-2.94,2.94) <-1.75,0.25>
Total: 248736 W: 64293 L: 64302 D: 120141
Ptnml(0-2): 925, 29833, 62831, 29884, 895
https://tests.stockfishchess.org/tests/view/663bee3bca93dad645f7f64a

Passed LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 254970 W: 64289 L: 64308 D: 126373
Ptnml(0-2): 110, 28428, 70422, 28421, 104
https://tests.stockfishchess.org/tests/view/663c11f0c0b75d7f7b97d4bb

closes https://github.com/official-stockfish/Stockfish/pull/5226

Bench: 2353057
 2024-05-09 09:02:57 +02:00
Shawn XuandJoost VandeVondele e13e4cfb83 Simplify NMP Condition 
Remove eval >= ss->staticEval condition for Null Move Pruning.

Passed non-regression STC:
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 44000 W: 11420 L: 11202 D: 21378
Ptnml(0-2): 174, 5243, 10978, 5401, 204
https://tests.stockfishchess.org/tests/live_elo/6603ee490ec64f0526c57984

Passed non-regression LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 82956 W: 20978 L: 20818 D: 41160
Ptnml(0-2): 54, 9353, 22499, 9523, 49
https://tests.stockfishchess.org/tests/live_elo/660464b50ec64f0526c5804d

closes https://github.com/official-stockfish/Stockfish/pull/5142

Bench 1759189
 2024-03-29 10:18:40 +01:00