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Author SHA1 Message Date
FauziAkramandJoost VandeVondele 2be0b2cdb4 Change ttmove reduction logic, and values 
Passed STC:
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 38112 W: 10024 L: 9708 D: 18380
Ptnml(0-2): 104, 4365, 9830, 4625, 132
https://tests.stockfishchess.org/tests/view/69dd25a33ca80bdf151d4b33

Passed LTC:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 256926 W: 65744 L: 64977 D: 126205
Ptnml(0-2): 126, 27919, 71612, 28674, 132
https://tests.stockfishchess.org/tests/view/69de48645c67bee7d241ff4e

Passed VLTC non-reg:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 174386 W: 44640 L: 44578 D: 85168
Ptnml(0-2): 26, 17847, 51384, 17911, 25
https://tests.stockfishchess.org/tests/view/69e767370e9667dd5a76551b

closes https://github.com/official-stockfish/Stockfish/pull/6782

Bench: 2788824
 2026-05-04 08:30:47 +02:00
FauziAkramandJoost VandeVondele 7bd32a51f5 Replacing the futility margin static value with a continuous transition 
Smooth the futility margin by interpolating the multiplier based on depth, replacing the previous static value with a continuous transition between depth 1 and 10.

Passed STC:
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 208448 W: 53891 L: 53324 D: 101233
Ptnml(0-2): 629, 24426, 53574, 24939, 656
https://tests.stockfishchess.org/tests/view/69e232206f344a19176002f3

Passed LTC:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 208938 W: 53432 L: 52765 D: 102741
Ptnml(0-2): 105, 22531, 58550, 23158, 125
https://tests.stockfishchess.org/tests/view/69e8b5d00e9667dd5a7656c6

closes https://github.com/official-stockfish/Stockfish/pull/6780

Bench: 2661424
 2026-05-04 08:30:28 +02:00
FauziAkramandJoost VandeVondele c787509663 Simplify time management reduction logic 
Simplify the time management reduction logic by replacing the previous sigmoid
function with the linear interpolate function introduced in #6729 , resulting
in a cleaner and more efficient calculation of move stability that avoids
unnecessary exponential operations.

Passed STC non-reg:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 161856 W: 41933 L: 41852 D: 78071
Ptnml(0-2): 418, 18137, 43792, 18108, 473
https://tests.stockfishchess.org/tests/view/69e117a46f344a1917600148

Passed LTC non-reg:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 108726 W: 27819 L: 27692 D: 53215
Ptnml(0-2): 59, 11084, 31942, 11227, 51
https://tests.stockfishchess.org/tests/view/69e563c00e9667dd5a7652ac

This is a follow-up for #6091  #6729

closes https://github.com/official-stockfish/Stockfish/pull/6765

No functional change
 2026-04-26 09:35:37 +02:00
FauziAkramandJoost VandeVondele 38d887ac64 Reuse Promotion Type Natively 
Piece promotion is generated, and then type_of(promotion) is used to retrieve
the underlying type. The class Move provides .promotion_type() natively,
meaning we can cache the type directly and avoid extracting it indirectly
afterward.  By extracting pt = m.promotion_type(); up front, we don't need to
call type_of(promotion) iteratively inside the assertions or conditions below.

closes https://github.com/official-stockfish/Stockfish/pull/6759

No functional change
 2026-04-26 09:25:45 +02:00
FauziAkramandJoost VandeVondele ed651aab54 Replacing std::clamp with std::min 
No functional change

closes https://github.com/official-stockfish/Stockfish/pull/6751

No functional change
 2026-04-20 17:45:03 +02:00
FauziAkramandJoost VandeVondele 7faecd75ac Combine duplicated - tb.plies subtraction logic 
closes https://github.com/official-stockfish/Stockfish/pull/6752

No functional change
 2026-04-20 17:44:01 +02:00
FauziAkramandJoost VandeVondele ce7848f7cc Remove the Redundant ply Variables in Benchmark Calculations 
In setup_benchmark, the variables evaluating the current ply simply mirror the
exact iterative progress of the string arrays loop (since ply just increments
by 1 with every pass). We can delete the separate integer assignment and
execute it securely within the loop declaration.

closes https://github.com/official-stockfish/Stockfish/pull/6732

No functional change
 2026-04-19 07:23:25 +02:00
FauziAkramandJoost VandeVondele c66acdac99 Restructure Futility pruning 
to a simpler and cleaner version

Passed non-reg test:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 175648 W: 45156 L: 45091 D: 85401
Ptnml(0-2): 459, 19228, 48383, 19297, 457
https://tests.stockfishchess.org/tests/view/69d8d9263ca80bdf151d454a

closes https://github.com/official-stockfish/Stockfish/pull/6733

No functional change
 2026-04-19 07:21:27 +02:00
FauziAkramandJoost VandeVondele cc4637b52b Remove Redundant Cast in MovePicker 
closes https://github.com/official-stockfish/Stockfish/pull/6735

No functional change
 2026-04-19 07:18:02 +02:00
FauziAkramandJoost VandeVondele 95f3680080 Replace constant LMR history divisor with depth-based array 
Passed STC:
LLR: 2.97 (-2.94,2.94) <0.00,2.00>
Total: 677344 W: 175301 L: 174041 D: 328002
Ptnml(0-2): 2018, 79669, 174166, 80673, 2146
https://tests.stockfishchess.org/tests/view/69cfae021668971c9da23b80

Passed LTC:
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 46470 W: 11988 L: 11651 D: 22831
Ptnml(0-2): 37, 4877, 13055, 5244, 22
https://tests.stockfishchess.org/tests/view/69dcd13c3ca80bdf151d4ab5

Passed VLTC (non-reg.):
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 58986 W: 15120 L: 14947 D: 28919
Ptnml(0-2): 7, 5835, 17636, 6008, 7
https://tests.stockfishchess.org/tests/view/69debc6c5c67bee7d241ffe9

closes https://github.com/official-stockfish/Stockfish/pull/6741

Bench: 2723949
 2026-04-19 07:15:43 +02:00
FauziAkramandJoost VandeVondele 0694742a31 Remove redundant std::skipws from fresh string streams 
In C++, all standard input streams (including std::istringstream) are initialized with the skipws format flag enabled by default. Because these stream objects are scoped locally and freshly constructed on each loop iteration, we are guaranteed that skipws is already active.

closes https://github.com/official-stockfish/Stockfish/pull/6719

No functional change
 2026-04-15 20:26:10 +02:00
FauziAkramandDisservin 5ae13d2bd4 Remove Redundant Branchless Execution 
Passed STC non-reg:
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 102272 W: 26553 L: 26411 D: 49308
Ptnml(0-2): 269, 11212, 28036, 11346, 273
https://tests.stockfishchess.org/tests/view/69d0f1c5e2b443cb2670b710

closes https://github.com/official-stockfish/Stockfish/pull/6707

No functional change
 2026-04-09 21:56:05 +02:00
FauziAkramandDisservin ef27b4db7b Using the already existing pawn_single_push_bb 
Using the already existing pawn_single_push_bb helper which encapsulates
the exact same logic.

closes https://github.com/official-stockfish/Stockfish/pull/6700

No functional change
 2026-04-09 21:53:08 +02:00
FauziAkramandDisservin 82908e0fd6 Simplify mtg in time management 
Passed Stc:
LLR: 3.05 (-2.94,2.94) <-1.75,0.25>
Total: 289088 W: 74727 L: 74773 D: 139588
Ptnml(0-2): 903, 30974, 80841, 30918, 908
https://tests.stockfishchess.org/tests/view/699d9093eaae015cd278eda3

Passed Ltc:
LLR: 3.02 (-2.94,2.94) <-1.75,0.25>
Total: 144438 W: 36859 L: 36766 D: 70813
Ptnml(0-2): 62, 13391, 45235, 13454, 77
https://tests.stockfishchess.org/tests/view/699f02913ece4c464328a264

Passed Sudden death:
LLR: 2.99 (-2.94,2.94) <-1.75,0.25>
Total: 53406 W: 13960 L: 13753 D: 25693
Ptnml(0-2): 265, 5848, 14253, 6089, 248
https://tests.stockfishchess.org/tests/view/69a47548a70d5f3736be6482

closes https://github.com/official-stockfish/Stockfish/pull/6644

No functional change
 2026-04-09 21:48:51 +02:00
FauziAkramandDisservin 19dec05602 Update a few outdated wrong comments 
closes https://github.com/official-stockfish/Stockfish/pull/6525

No functional change
 2026-04-09 21:48:40 +02:00
FauziAkramandDisservin add173263d VVLTC Tune 
Passed VVLTC with stc bounds:
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 69810 W: 18119 L: 17814 D: 33877
Ptnml(0-2): 6, 6222, 22144, 6527, 6
https://tests.stockfishchess.org/tests/view/69b43f666c456d3a77a50a5d

Passed VVLTC with ltc bounds:
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 52458 W: 13574 L: 13258 D: 25626
Ptnml(0-2): 5, 4632, 16636, 4954, 2
https://tests.stockfishchess.org/tests/view/69b16dfbd0c9228834e88e99

closes https://github.com/official-stockfish/Stockfish/pull/6669

Bench: 3164843
 2026-03-18 20:49:06 +01:00
FauziAkramJoost VandeVondeleDaniel Samek
 		8b6d8def30 Counter-Move History Continuity (CMHC) 
Currently, the engine updates each level of the continuation history stack (ply -1, -2, -3, etc.) with fixed weights that are independent of one another. The idea behind CMHC is to scale the magnitude of these updates based on the consistency of the move's performance across the stack.
By tracking how often a move has historically performed well (positive history) within the current continuation context, we can adjust the update magnitude dynamically. Moves that demonstrate "continuity" (appearing as strong candidates across multiple historical contexts) receive more significant updates, while unproven or inconsistent moves are dampened.

Passed STC:
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 103264 W: 26954 L: 26541 D: 49769
Ptnml(0-2): 338, 11910, 26728, 12313, 343
https://tests.stockfishchess.org/tests/view/69a81702fac54339cf435a87

Passed LTC:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 47406 W: 12259 L: 11920 D: 23227
Ptnml(0-2): 22, 5052, 13237, 5349, 43
https://tests.stockfishchess.org/tests/view/69aab480bd35724e4b290498

closes https://github.com/official-stockfish/Stockfish/pull/6653

Bench: 2356418

Co-Authored-By: Daniel Samek <samekdaniel@email.cz>
 2026-03-07 22:16:22 +01:00
FauziAkramandJoost VandeVondele e6d04b4ec5 VVLTC tune 
Passed VVLTC with stc bounds:
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 21424 W: 5638 L: 5387 D: 10399
Ptnml(0-2): 2, 1925, 6607, 2176, 2
https://tests.stockfishchess.org/tests/view/69938fbcff782f8eeef612a9

Passed VVLTC with ltc bounds:
LLR: 2.96 (-2.94,2.94) <0.50,2.50>
Total: 33410 W: 8784 L: 8499 D: 16127
Ptnml(0-2): 5, 2968, 10474, 3253, 5
https://tests.stockfishchess.org/tests/view/69923ea872254723ef22c6fa

Verify Elo loss at STC:
LLR: -2.93 (-2.94,2.94) <-1.75,0.25>
Total: 17504 W: 4420 L: 4704 D: 8380
Ptnml(0-2): 56, 2259, 4420, 1947, 70
https://tests.stockfishchess.org/tests/view/69946e4186e4a3231411625b

closes https://github.com/official-stockfish/Stockfish/pull/6616

bench: 3074962
 2026-02-18 05:54:55 +01:00
FauziAkramandDisservin f0d0c3ddd2 Simplify Triple Margin Formula 
Passed STC:
LLR: 3.01 (-2.94,2.94) <-1.75,0.25>
Total: 517472 W: 133271 L: 133575 D: 250626
Ptnml(0-2): 1628, 61366, 133032, 61102, 1608
https://tests.stockfishchess.org/tests/view/69590175d844c1ce7cc7e9a2

Passed LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 95430 W: 24242 L: 24098 D: 47090
Ptnml(0-2): 42, 10289, 26926, 10399, 59
https://tests.stockfishchess.org/tests/view/695f7f03ca95f52e4b85253c

Passed VVLTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 58828 W: 15299 L: 15135 D: 28394
Ptnml(0-2): 4, 5277, 18687, 5443, 3
https://tests.stockfishchess.org/tests/view/6961686c8709a8d27c0383f6

closes https://github.com/official-stockfish/Stockfish/pull/6546

Bench: 2570943
 2026-02-08 15:22:06 +01:00
FauziAkramandJoost VandeVondele 9b8c5c9f75 Simplify fail high reduction formula 
Passed STC:
LLR: 2.97 (-2.94,2.94) <-1.75,0.25>
Total: 165792 W: 42849 L: 42768 D: 80175
Ptnml(0-2): 512, 19499, 42800, 19566, 519
https://tests.stockfishchess.org/tests/view/695cdd95912b7ff140de60c2

Passed LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 80448 W: 20619 L: 20459 D: 39370
Ptnml(0-2): 47, 8693, 22596, 8829, 59
https://tests.stockfishchess.org/tests/view/695f7e84ca95f52e4b852536

closes https://github.com/official-stockfish/Stockfish/pull/6535

bench: 2050811
 2026-01-10 15:47:11 +01:00
FauziAkramandJoost VandeVondele 5b9259e51f Replacing nested loops with a single range-based for loop 
closes https://github.com/official-stockfish/Stockfish/pull/6503

No functional change
 2026-01-01 16:12:35 +01:00
FauziAkramandDisservin 9d69577e19 Removing redundant parentheses 
closes https://github.com/official-stockfish/Stockfish/pull/6490

No functional change
 2025-12-28 14:50:36 +01:00
FauziAkramandDisservin cd3a837324 Refine reduction logic based on next-ply cutoff count 
Passed STC:
LLR: 2.95 (-2.94,2.94) <0.00,2.00>
Total: 38208 W: 10076 L: 9754 D: 18378
Ptnml(0-2): 139, 4390, 9742, 4676, 157
https://tests.stockfishchess.org/tests/view/6945bb6446f342e1ec211d93

Passed LTC:
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 64086 W: 16529 L: 16157 D: 31400
Ptnml(0-2): 34, 6808, 17990, 7174, 37
https://tests.stockfishchess.org/tests/view/69479d303c8768ca45072446

closes https://github.com/official-stockfish/Stockfish/pull/6489

Bench: 2442415
 2025-12-28 14:49:19 +01:00
FauziAkramandDisservin 4d4c6ebd02 Simplify doDeeperSearch formula 
Passed STC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 211776 W: 54939 L: 54911 D: 101926
Ptnml(0-2): 714, 24971, 54484, 25011, 708
https://tests.stockfishchess.org/tests/view/6938971875b70713ef796b70

Passed LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 216774 W: 55346 L: 55326 D: 106102
Ptnml(0-2): 105, 23599, 60980, 23577, 126
https://tests.stockfishchess.org/tests/view/693fc91f46f342e1ec20f9f6

closes https://github.com/official-stockfish/Stockfish/pull/6486

Bench: 3267755
 2025-12-23 21:42:45 +01:00
FauziAkramandDisservin fb41f2953f Remove low ply history for check evasions scoring 
Passed STC:
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 81888 W: 21336 L: 21166 D: 39386
Ptnml(0-2): 284, 9438, 21342, 9584, 296
https://tests.stockfishchess.org/tests/view/692ada47b23dfeae38cffce5

Passed LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 107328 W: 27534 L: 27404 D: 52390
Ptnml(0-2): 55, 11390, 30659, 11490, 70
https://tests.stockfishchess.org/tests/view/692d7a01b23dfeae38d011ab

closes https://github.com/official-stockfish/Stockfish/pull/6467

Bench: 3006182
 2025-12-23 21:41:34 +01:00
FauziAkramandDisservin 863c0ec6d0 Simplify piece threat calculation 
Passed STC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 105984 W: 27206 L: 27067 D: 51711
Ptnml(0-2): 260, 11556, 29245, 11647, 284
https://tests.stockfishchess.org/tests/view/6914798e7ca87818523317cf

Passed LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 53028 W: 13635 L: 13456 D: 25937
Ptnml(0-2): 28, 5184, 15908, 5369, 25
https://tests.stockfishchess.org/tests/view/6918c5fc7ca8781852332312

closes https://github.com/official-stockfish/Stockfish/pull/6459

No functional change
 2025-12-21 15:43:25 +01:00
FauziAkramandDisservin 5edfabd070 Fix Typo 
closes https://github.com/official-stockfish/Stockfish/pull/6436

No functional change
 2025-12-21 15:22:06 +01:00
FauziAkramandDisservin c95386256e Simplify the highBestMoveEffort formula in Time management 
Passed STC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 22272 W: 5885 L: 5655 D: 10732
Ptnml(0-2): 76, 2329, 6108, 2535, 88
https://tests.stockfishchess.org/tests/view/69244d07ba083df4ca63e02b

Passed LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 48690 W: 12405 L: 12221 D: 24064
Ptnml(0-2): 29, 4755, 14597, 4931, 33
https://tests.stockfishchess.org/tests/view/6924de9aba083df4ca63e327

closes https://github.com/official-stockfish/Stockfish/pull/6451

No functional change
 2025-11-30 21:58:35 +01:00
FauziAkramandJoost VandeVondele df88db16c6 Simplify NMP reduction formula 
Passed STC:
LLR: 2.97 (-2.94,2.94) <-1.75,0.25>
Total: 178912 W: 46625 L: 46559 D: 85728
Ptnml(0-2): 540, 21167, 45975, 21235, 539
https://tests.stockfishchess.org/tests/view/69060677ea4b268f1fac1f25

Passed LTC:
LLR: 2.99 (-2.94,2.94) <-1.75,0.25>
Total: 140988 W: 36278 L: 36176 D: 68534
Ptnml(0-2): 82, 15520, 39215, 15568, 109
https://tests.stockfishchess.org/tests/view/6908bc32ea4b268f1fac288f

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

bench: 2959834
 2025-11-14 17:24:16 +01:00
FauziAkramandJoost VandeVondele bc9f08731f Simplify Futility pruning formula 
Passed STC:
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 170112 W: 44266 L: 44193 D: 81653
Ptnml(0-2): 599, 20062, 43611, 20235, 549
https://tests.stockfishchess.org/tests/view/68f50b94637acd2a11e721ad

Passed LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 164658 W: 42393 L: 42318 D: 79947
Ptnml(0-2): 120, 18127, 45747, 18228, 107
https://tests.stockfishchess.org/tests/view/68fa6683637acd2a11e72ac3

closes https://github.com/official-stockfish/Stockfish/pull/6389

bench: 2351426
 2025-11-01 11:39:00 +01:00
FauziAkramandJoost VandeVondele 7a7c033a86 Tweak Correction History Bonus Asymmetrically 
Refine the correction history update by applying an asymmetric bonus based on the type of evaluation error. It differentiates between negative corrections and positive corrections.

Passed STC:
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 165184 W: 43314 L: 42807 D: 79063
Ptnml(0-2): 551, 19391, 42261, 19778, 611
https://tests.stockfishchess.org/tests/view/68cae49902c43c969fe7f008

Passed LTC:
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 243234 W: 62765 L: 62029 D: 118440
Ptnml(0-2): 163, 25996, 68551, 26756, 151
https://tests.stockfishchess.org/tests/view/68d1c50dfa806e2e8393aa1f

closes https://github.com/official-stockfish/Stockfish/pull/6338

Bench: 2746404
 2025-10-05 09:25:44 +02:00
FauziAkramandJoost VandeVondele 40aeb5a411 Simplify away conthist 0 
While at it, I also added the scaler note to the Lmrdepth/history formula.

Passed STC:
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 25376 W: 6660 L: 6423 D: 12293
Ptnml(0-2): 77, 2947, 6403, 3184, 77
https://tests.stockfishchess.org/tests/view/68c1ccf759efc3c96b610deb

Passed LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 208464 W: 53371 L: 53342 D: 101751
Ptnml(0-2): 110, 22776, 58426, 22815, 105
https://tests.stockfishchess.org/tests/view/68c1d04b59efc3c96b610e13

closes https://github.com/official-stockfish/Stockfish/pull/6304

Bench: 2029296
 2025-09-28 21:14:28 +02:00
FauziAkramandJoost VandeVondele bbad001a49 Double PawnHistory size and update formula 
Doubling PAWN_HISTORY_SIZE to 1024. So with that, we can apply a stronger learning signal.
The bonus/malus multipliers in the update_quiet_histories function have been increased accordingly.

Passed STC:
LLR: 2.97 (-2.94,2.94) <0.00,2.00>
Total: 111008 W: 29136 L: 28708 D: 53164
Ptnml(0-2): 367, 12870, 28609, 13284, 374
https://tests.stockfishchess.org/tests/view/68c201d659efc3c96b61117e

Passed LTC:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 117210 W: 30142 L: 29664 D: 57404
Ptnml(0-2): 49, 12532, 32970, 13000, 54
https://tests.stockfishchess.org/tests/view/68c20a6259efc3c96b6111ef

closes https://github.com/official-stockfish/Stockfish/pull/6306

Bench: 2788334
 2025-09-28 20:51:34 +02:00
FauziAkramandJoost VandeVondele c99eb8ef32 Remove cap from a bonusScale formula 
Passed STC:
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 127264 W: 33159 L: 33042 D: 61063
Ptnml(0-2): 336, 14509, 33866, 14544, 377
https://tests.stockfishchess.org/tests/view/68a63fccb6fb3300203bc818

Passed LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 469512 W: 120094 L: 120331 D: 229087
Ptnml(0-2): 238, 51317, 131885, 51076, 240
https://tests.stockfishchess.org/tests/view/68a8d867b6fb3300203bcab5

closes https://github.com/official-stockfish/Stockfish/pull/6260

Bench: 2433974
 2025-08-24 20:01:01 +02:00
FauziAkramandJoost VandeVondele 176ef577e2 Set back static constexpr 
closes https://github.com/official-stockfish/Stockfish/pull/6243

No functional change
 2025-08-24 19:39:49 +02:00
FauziAkramandJoost VandeVondele 7fe46b5a70 VVLTC tweak 
Passed VVLTC with STC bounds:
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 60796 W: 15908 L: 15609 D: 29279
Ptnml(0-2): 6, 5598, 18889, 5901, 4
https://tests.stockfishchess.org/tests/view/68a1fbfeb6fb3300203bbc5c

Passed VVLTC with LTC bounds:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 24914 W: 6528 L: 6256 D: 12130
Ptnml(0-2): 4, 2263, 7648, 2541, 1
https://tests.stockfishchess.org/tests/view/68a211aeb6fb3300203bbca7

closes https://github.com/official-stockfish/Stockfish/pull/6241

Bench: 2130122
 2025-08-17 22:46:04 +02:00
FauziAkramandJoost VandeVondele d864148595 Simplify beta formula 
Passed STC:
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 152384 W: 39907 L: 39814 D: 72663
Ptnml(0-2): 557, 17958, 39053, 18083, 541
https://tests.stockfishchess.org/tests/view/6890b66692fcad741b804a10

Passed LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 98688 W: 25411 L: 25270 D: 48007
Ptnml(0-2): 45, 10692, 27743, 10805, 59
https://tests.stockfishchess.org/tests/view/6896019c618946ab878347b0

closes: https://github.com/official-stockfish/Stockfish/pull/6220

bench: 3002300
 2025-08-16 11:57:44 +02:00
FauziAkramandJoost VandeVondele ade8917447 Remove outdated comment 
Remove the Elo worth, as they are now completely outdated, making them irrelevant and potentially misleading
Continuation of #5810 as these comments in "history.h" were missed.

closes https://github.com/official-stockfish/Stockfish/pull/6216

No functional change
 2025-08-09 09:04:33 +02:00
FauziAkramandJoost VandeVondele 8e733d68fd Refactor: Simplify pawn structure indexing 
Refactoring the mechanism for calculating pawn structure hash indices and make it consistent with the rest.

closes https://github.com/official-stockfish/Stockfish/pull/6205

No functional change
 2025-08-04 14:56:03 +02:00
FauziAkramandJoost VandeVondele a37b38bdf0 Add "d < newDepth" condition for doDeeperSearch 
Add "d < newDepth" condition for doDeeperSearch

Passed STC:
LLR: 2.97 (-2.94,2.94) <0.00,2.00>
Total: 66144 W: 17512 L: 17148 D: 31484
Ptnml(0-2): 220, 7726, 16833, 8056, 237
https://tests.stockfishchess.org/tests/view/6887cce67b562f5f7b731a79

Passed LTC:
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 411240 W: 106103 L: 105023 D: 200114
Ptnml(0-2): 256, 44249, 115566, 45257, 292
https://tests.stockfishchess.org/tests/view/6887ec527b562f5f7b731c37

closes https://github.com/official-stockfish/Stockfish/pull/6204

Bench: 2917036
 2025-08-02 16:25:31 +02:00
FauziAkramandJoost VandeVondele 62b958f517 Remove code that is not used anywhere 
closes https://github.com/official-stockfish/Stockfish/pull/6201

No functional change
 2025-08-02 16:21:41 +02:00
FauziAkramandJoost VandeVondele fdd9c34b75 Re-adding ttHit condition, but this time in the inner block 
Passed STC:
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 150240 W: 39305 L: 38819 D: 72116
Ptnml(0-2): 536, 17541, 38494, 17999, 550
https://tests.stockfishchess.org/tests/view/6887ce577b562f5f7b731a85

Passed LTC:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 159120 W: 41025 L: 40461 D: 77634
Ptnml(0-2): 96, 16974, 44866, 17518, 106
https://tests.stockfishchess.org/tests/view/6887f0ba7b562f5f7b731c5d

closes https://github.com/official-stockfish/Stockfish/pull/6193

bench: 3498926
 2025-08-02 15:50:17 +02:00
FauziAkramandJoost VandeVondele a9b7638e96 Simplify newDepth modification formulas 
Passed STC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 21856 W: 5709 L: 5471 D: 10676
Ptnml(0-2): 77, 2466, 5589, 2734, 62
https://tests.stockfishchess.org/tests/view/68862ea4966ed85face24a27

Passed LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 108828 W: 27893 L: 27763 D: 53172
Ptnml(0-2): 59, 11860, 30435, 12012, 48
https://tests.stockfishchess.org/tests/view/68863046966ed85face24a3b

closes https://github.com/official-stockfish/Stockfish/pull/6181

Bench: 3069051
 2025-07-28 20:03:05 +02:00
FauziAkramandJoost VandeVondele 9045fdb227 Add depth condition 
Passed STC:
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 103360 W: 26941 L: 26530 D: 49889
Ptnml(0-2): 291, 11964, 26770, 12353, 302
https://tests.stockfishchess.org/tests/view/68863547966ed85face24a6f

Passed LTC:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 115128 W: 29734 L: 29258 D: 56136
Ptnml(0-2): 48, 12406, 32182, 12878, 50
https://tests.stockfishchess.org/tests/view/68864f867b562f5f7b7312f2

closes https://github.com/official-stockfish/Stockfish/pull/6184

Bench: 2972498
 2025-07-28 19:49:05 +02:00
FauziAkramandJoost VandeVondele 4fcfb0b4b7 Tweak the logic for setting the improving flag 
Tweak the logic for setting the improving flag when the static evaluation is significantly higher than alpha.

Passed STC:
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 92320 W: 24057 L: 23664 D: 44599
Ptnml(0-2): 247, 10689, 23893, 11086, 245
https://tests.stockfishchess.org/tests/view/68860aba966ed85face248a1

Passed LTC:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 281292 W: 72496 L: 71683 D: 137113
Ptnml(0-2): 135, 30289, 78995, 31082, 145
https://tests.stockfishchess.org/tests/view/6886168c966ed85face24962

closes https://github.com/official-stockfish/Stockfish/pull/6180

Bench: 3200439
 2025-07-28 19:45:13 +02:00
FauziAkramandJoost VandeVondele bdc393d3a2 Correct comment 
closes https://github.com/official-stockfish/Stockfish/pull/6159

No functional change
 2025-07-24 10:26:15 +02:00
FauziAkramandJoost VandeVondele 793110ca19 Remove !ttData.move condition from cutNode reduction 
Passed STC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 118080 W: 30427 L: 30298 D: 57355
Ptnml(0-2): 290, 13880, 30561, 14029, 280
https://tests.stockfishchess.org/tests/view/6853f9bc038630d25f468670

Passed LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 232272 W: 59187 L: 59182 D: 113903
Ptnml(0-2): 111, 25430, 65014, 25505, 76
https://tests.stockfishchess.org/tests/view/68585c40a596a06817bb922e

closes https://github.com/official-stockfish/Stockfish/pull/6157

bench: 2227361
 2025-07-24 10:19:10 +02:00
FauziAkramandJoost VandeVondele 6a09a24cd8 Remove depth condition from ttCapture reduction 
Passed STC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 25920 W: 6822 L: 6593 D: 12505
Ptnml(0-2): 54, 2932, 6783, 3113, 78
https://tests.stockfishchess.org/tests/view/6853f9c2038630d25f468672

Passed LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 177318 W: 45339 L: 45278 D: 86701
Ptnml(0-2): 85, 19333, 49765, 19388, 88
https://tests.stockfishchess.org/tests/view/6854468a038630d25f4686c0

closes https://github.com/official-stockfish/Stockfish/pull/6149

bench: 2437275
 2025-07-24 09:52:35 +02:00
FauziAkramandDisservin ce73441f20 Simplify sudden death time optimization 
Passed Sudden Death STC:
https://tests.stockfishchess.org/tests/view/68455fe5375c2b77d9855351
LLR: 2.91 (-2.94,2.94) <-1.75,0.25>
Total: 49248 W: 13008 L: 12798 D: 23442
Ptnml(0-2): 309, 5491, 12821, 5687, 316

Passed Sudden Death LTC:
https://tests.stockfishchess.org/tests/view/6845a392375c2b77d98553cf
LLR: 3.01 (-2.94,2.94) <-1.75,0.25>
Total: 551070 W: 141699 L: 142031 D: 267340
Ptnml(0-2): 1923, 60608, 150916, 60054, 2034

Passed Standard STC:
https://tests.stockfishchess.org/tests/view/683c5ebb6ec7634154f9d989
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 142624 W: 36808 L: 36709 D: 69107
Ptnml(0-2): 302, 15448, 39745, 15483, 334

Passed Standard LTC:
https://tests.stockfishchess.org/tests/view/683f1a4f6ec7634154f9dc5a
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 146922 W: 37381 L: 37296 D: 72245
Ptnml(0-2): 69, 13552, 46117, 13671, 52

closes https://github.com/official-stockfish/Stockfish/pull/6132

Bench: 2249459
 2025-07-02 18:41:46 +02:00
FauziAkramandDisservin e695b9537e Remove eval & beta diff from NM reduction 
Passed STC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 43456 W: 11178 L: 10966 D: 21312
Ptnml(0-2): 114, 5078, 11114, 5326, 96
https://tests.stockfishchess.org/tests/view/6849ae13e84567164b5c9de9

Passed LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 63090 W: 16302 L: 16125 D: 30663
Ptnml(0-2): 37, 6837, 17603, 7048, 20
https://tests.stockfishchess.org/tests/view/684ab516e84567164b5ca02f

closes https://github.com/official-stockfish/Stockfish/pull/6134

Bench: 2249459
 2025-07-02 18:41:46 +02:00
FauziAkramandJoost VandeVondele 9b79b75c9b Enforce minimum compiler versions 
gcc 9.3
clang 10

using unsupported compiler versions will generate an error,
older version might miscompile SF

CI: improves output on failed bench output

closes https://github.com/official-stockfish/Stockfish/pull/6032

No functional change
 2025-06-02 21:09:19 +02:00
FauziAkramandJoost VandeVondele 73c55e8949 Simplify Double Margin Formula 
Passed STC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 267296 W: 69214 L: 69248 D: 128834
Ptnml(0-2): 760, 31511, 69141, 31475, 761
https://tests.stockfishchess.org/tests/view/682f5d9a6ec7634154f9b01e

Passed LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 67872 W: 17460 L: 17289 D: 33123
Ptnml(0-2): 25, 7238, 19243, 7401, 29
https://tests.stockfishchess.org/tests/view/6833074b6ec7634154f9b5ae

Passed VLTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 118000 W: 30337 L: 30222 D: 57441
Ptnml(0-2): 15, 11783, 35289, 11898, 15
https://tests.stockfishchess.org/tests/view/683336c56ec7634154f9ba46

closes https://github.com/official-stockfish/Stockfish/pull/6097

Bench: 2312696
 2025-05-25 21:31:12 +02:00
FauziAkramandJoost VandeVondele fe7b9b14d2 Implement smoother reduction in time management 
Implement smoother time reduction in time management by replacing a conditional
assignment with a continuous sigmoid-based function. The updated logic employs
a sigmoid-like function for a more gradual adjustment.

Passed STC:
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 64448 W: 16838 L: 16492 D: 31118
Ptnml(0-2): 145, 7214, 17207, 7466, 192
https://tests.stockfishchess.org/tests/view/6829dc046ec7634154f99fba

Passed LTC:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 407340 W: 104458 L: 103408 D: 199474
Ptnml(0-2): 196, 42281, 117664, 43335, 194
https://tests.stockfishchess.org/tests/view/6829fe1b6ec7634154f9a036

closes https://github.com/official-stockfish/Stockfish/pull/6091

No functional change
 2025-05-25 21:03:16 +02:00
FauziAkramandJoost VandeVondele 4f76768fcf Remove a moveCount condition 
Passed STC:
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 70816 W: 18315 L: 18134 D: 34367
Ptnml(0-2): 210, 8213, 18360, 8436, 189
https://tests.stockfishchess.org/tests/view/68248197a527315e07cccb2d

Passed LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 121770 W: 31248 L: 31130 D: 59392
Ptnml(0-2): 61, 13338, 33995, 13404, 87
https://tests.stockfishchess.org/tests/view/68272ff46ec7634154f998ad

closes https://github.com/official-stockfish/Stockfish/pull/6067

bench: 2319161
 2025-05-19 07:31:26 +02:00
FauziAkramandJoost VandeVondele 07f6edf934 Refactor Position::pseudo_legal Pawn Move Check 
use intermediate variables to make the statement easier to read

closes https://github.com/official-stockfish/Stockfish/pull/6045

No functional change
 2025-05-19 07:12:11 +02:00
FauziAkramandDisservin c4e2479a75 Introducing a depth component to the penalty. 
Passed STC:
LLR: 2.97 (-2.94,2.94) <0.00,2.00>
Total: 31648 W: 8358 L: 8050 D: 15240
Ptnml(0-2): 78, 3596, 8182, 3876, 92
https://tests.stockfishchess.org/tests/view/680fa73d3629b02d74b165a9

Passed LTC:
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 177720 W: 45524 L: 44920 D: 87276
Ptnml(0-2): 91, 19130, 49813, 19736, 90
https://tests.stockfishchess.org/tests/view/68109e2c3629b02d74b166ee

closes https://github.com/official-stockfish/Stockfish/pull/6060

Bench: 2251724
 2025-05-13 20:47:50 +02:00
FauziAkramandDisservin 40ef7b1212 Simplify probcut 
Passed STC:
LLR: 2.97 (-2.94,2.94) <-1.75,0.25>
Total: 80800 W: 20947 L: 20774 D: 39079
Ptnml(0-2): 217, 9446, 20906, 9609, 222
https://tests.stockfishchess.org/tests/view/680e83163629b02d74b15e2a

Passed LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 359004 W: 91362 L: 91486 D: 176156
Ptnml(0-2): 177, 39133, 101007, 39007, 178
https://tests.stockfishchess.org/tests/view/680e95db3629b02d74b15e7a

closes https://github.com/official-stockfish/Stockfish/pull/6054

Bench: 2060860
 2025-05-13 20:41:01 +02:00
FauziAkramandDisservin d4b405a5a6 Remove a cutNode condition 
Allow some nodes to spawn even deeper lmr searches, also for cutNodes

Passed STC:
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 59072 W: 15387 L: 15190 D: 28495
Ptnml(0-2): 145, 6956, 15166, 7095, 174
https://tests.stockfishchess.org/tests/view/6810b4c13629b02d74b16714

Passed LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 93294 W: 23737 L: 23591 D: 45966
Ptnml(0-2): 47, 10116, 26169, 10274, 41
https://tests.stockfishchess.org/tests/view/681170613629b02d74b167f3

closes https://github.com/official-stockfish/Stockfish/pull/6052

Bench: 1937565
 2025-05-13 20:39:23 +02:00
FauziAkramDisservinMichael Chalyxu-shawn
 		ed6b8d179a Refactor futility_margin 
a small term to the futility calculation that depends on eval - beta.

Passed STC:
LLR: 2.95 (-2.94,2.94) <0.00,2.00>
Total: 203136 W: 52797 L: 52239 D: 98100
Ptnml(0-2): 549, 23827, 52255, 24391, 546
https://tests.stockfishchess.org/tests/view/680e84a43629b02d74b15e2e

Passed LTC:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 100356 W: 25950 L: 25507 D: 48899
Ptnml(0-2): 35, 10683, 28302, 11120, 38
https://tests.stockfishchess.org/tests/view/680ebcb03629b02d74b16040

closes https://github.com/official-stockfish/Stockfish/pull/6009
closes https://github.com/official-stockfish/Stockfish/pull/6041

Bench: 1815939

Co-authored-by: Michael Chaly <Vizvezdenec@gmail.com>
Co-authored-by: xu-shawn <50402888+xu-shawn@users.noreply.github.com>
 2025-05-13 20:26:28 +02:00
FauziAkramandDisservin 94e6c0498f VVLTC Tune 
Passed VVLTC with LTC bounds:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 12800 W: 3432 L: 3184 D: 6184
Ptnml(0-2): 1, 1098, 3954, 1346, 1
https://tests.stockfishchess.org/tests/view/680e255e3629b02d74b15d5e

Passed VVLTC with STC bounds:
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 14402 W: 3865 L: 3625 D: 6912
Ptnml(0-2): 0, 1236, 4490, 1474, 1
https://tests.stockfishchess.org/tests/view/680e4dfb3629b02d74b15da6

Passed VVLTC third test (removing an unrelated change):
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 25584 W: 6670 L: 6398 D: 12516
Ptnml(0-2): 4, 2290, 7932, 2562, 4
https://tests.stockfishchess.org/tests/view/680e74223629b02d74b15def

closes https://github.com/official-stockfish/Stockfish/pull/6036

Bench: 1857323
 2025-04-27 20:47:47 +02:00
FauziAkramandDisservin 267fd8a3d5 Tweak History Bonus 
Inspired by @Ergodice , who came up first with the idea.

Passed STC:
LLR: 2.96 (-2.94,2.94) <0.00,2.00>
Total: 18400 W: 4867 L: 4576 D: 8957
Ptnml(0-2): 52, 2052, 4714, 2317, 65
https://tests.stockfishchess.org/tests/view/68062a3c98cd372e3aea5959

Passed LTC:
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 454338 W: 116461 L: 115294 D: 222583
Ptnml(0-2): 198, 49139, 127346, 50270, 216
https://tests.stockfishchess.org/tests/view/6806347c98cd372e3aea5967

Passed VLTC non-reg:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 385970 W: 98401 L: 98546 D: 189023
Ptnml(0-2): 51, 38958, 115105, 38827, 44
https://tests.stockfishchess.org/tests/view/680cfe873629b02d74b155cf

closes https://github.com/official-stockfish/Stockfish/pull/6030

Bench: 1715817
 2025-04-27 20:14:38 +02:00
FauziAkramandDisservin e5aa4b48c6 Simplify Evasion Move Scoring 
Passed STC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 160256 W: 41432 L: 41348 D: 77476
Ptnml(0-2): 485, 19034, 41028, 19074, 507
https://tests.stockfishchess.org/tests/view/680d242c3629b02d74b15662

Passed LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 103086 W: 26388 L: 26252 D: 50446
Ptnml(0-2): 41, 11174, 28982, 11300, 46
https://tests.stockfishchess.org/tests/view/680d47f83629b02d74b1571e

closes https://github.com/official-stockfish/Stockfish/pull/6029

Bench: 1937261
 2025-04-27 19:47:08 +02:00
FauziAkramandDisservin f98c178960 Improve quiet moves bonus 
Inspired by an old test by Peregrine.

Passed STC:
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 453024 W: 117244 L: 116316 D: 219464
Ptnml(0-2): 1336, 53355, 116258, 54171, 1392
https://tests.stockfishchess.org/tests/view/680ccacc3629b02d74b15532

Passed LTC:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 140550 W: 35990 L: 35462 D: 69098
Ptnml(0-2): 65, 15152, 39319, 15668, 71
https://tests.stockfishchess.org/tests/view/680d2ed73629b02d74b15691

closes https://github.com/official-stockfish/Stockfish/pull/6028

Bench: 1708152
 2025-04-27 19:45:37 +02:00
FauziAkramandJoost VandeVondele 5f32b3ed4b Remove unneeded return statement 
closes https://github.com/official-stockfish/Stockfish/pull/6013

No functional change
 2025-04-26 22:26:39 +02:00
FauziAkramandJoost VandeVondele 8b85290313 Remove manual stack alignment workaround for GCC < 9.3 
consequently using these old compilers will now error out.

closes https://github.com/official-stockfish/Stockfish/pull/6008

No functional change.
 2025-04-26 22:15:08 +02:00
FauziAkramandJoost VandeVondele f6b0d53a99 Re-adding the 5th continuation history 
the two simplifications (#5992 and  #5978) are strongly correlated.

Passed STC:
LLR: 2.95 (-2.94,2.94) <0.00,2.00>
Total: 98016 W: 25415 L: 25008 D: 47593
Ptnml(0-2): 291, 11509, 25005, 11908, 295
https://tests.stockfishchess.org/tests/view/6802774fcd501869c6698168

Passed LTC:
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 588588 W: 150073 L: 148633 D: 289882
Ptnml(0-2): 281, 63615, 165078, 65023, 297
https://tests.stockfishchess.org/tests/view/6804cbdacd501869c66987dc

closes https://github.com/official-stockfish/Stockfish/pull/6002

Bench: 1783315
 2025-04-26 21:58:46 +02:00
FauziAkramandDisservin 44efbaddea Simplify bonusScale calculation 
Allowing this specific term to potentially become negative for low depth
values is ok, because the overall `bonusScale` is explicitly ensured to
be non-negative a few lines later: bonusScale = std::max(bonusScale, 0);

Passed STC:
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 164928 W: 42446 L: 42368 D: 80114
Ptnml(0-2): 497, 19551, 42306, 19597, 513
https://tests.stockfishchess.org/tests/view/67debf0b8888403457d8736c

Passed LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 234942 W: 59539 L: 59537 D: 115866
Ptnml(0-2): 113, 25639, 65964, 25643, 112
https://tests.stockfishchess.org/tests/view/67e2e1c48888403457d87768

closes https://github.com/official-stockfish/Stockfish/pull/5979

Bench: 1933843
 2025-04-18 14:32:26 +02:00
FauziAkramandDisservin 5f8e67a544 Remove combineLast3 optimization 
Passed non-reg STC 1st:
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 67328 W: 17296 L: 17118 D: 32914
Ptnml(0-2): 158, 7095, 19011, 7211, 189
https://tests.stockfishchess.org/tests/view/67e6c2796682f97da2178ebe

Passed non-reg STC 2nd:
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 92288 W: 23885 L: 23734 D: 44669
Ptnml(0-2): 213, 10039, 25518, 10132, 242
https://tests.stockfishchess.org/tests/view/67ed6a2d31d7cf8afdc45190

closes https://github.com/official-stockfish/Stockfish/pull/5975

Bench: 1875196
 2025-04-18 14:32:26 +02:00
FauziAkramandDisservin cf8b3637a0 Improve futility pruning 
Adding a small term to the futility calculation that depends on eval - beta.
Refactored to a simpler form.

Passed STC:
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 74176 W: 19323 L: 18954 D: 35899
Ptnml(0-2): 226, 8576, 19117, 8941, 228
https://tests.stockfishchess.org/tests/view/67e6b0946682f97da2178eaf

Passed LTC:
LLR: 2.96 (-2.94,2.94) <0.50,2.50>
Total: 135090 W: 34499 L: 33983 D: 66608
Ptnml(0-2): 79, 14403, 38040, 14969, 54
https://tests.stockfishchess.org/tests/view/67e757cc6682f97da2178f62

closes https://github.com/official-stockfish/Stockfish/pull/5970

Bench: 1875196
 2025-04-18 14:32:19 +02:00
FauziAkramandDisservin dfef7e7520 Remove redundant assignment 
closes https://github.com/official-stockfish/Stockfish/pull/5944

No functional change
 2025-04-02 17:36:46 +02:00
FauziAkramandDisservin 0dabf4f3fa Removing the conditional bonus calculation 
The new value is just a guessed value.

Passed STC:
https://tests.stockfishchess.org/tests/view/67d5ee09517865b4a2dfd2df
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 52128 W: 13516 L: 13312 D: 25300
Ptnml(0-2): 157, 6044, 13451, 6262, 150

Passed LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 42384 W: 10855 L: 10657 D: 20872
Ptnml(0-2): 19, 4554, 11852, 4744, 23
https://tests.stockfishchess.org/tests/view/67d5f9d3517865b4a2dfd2ef

closes https://github.com/official-stockfish/Stockfish/pull/5933

Bench: 2030154
 2025-03-21 11:22:25 +01:00
FauziAkramandDisservin 4afd7f1a7b Removing contHist[1] from pruning formula 
Passed STC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 51552 W: 13297 L: 13091 D: 25164
Ptnml(0-2): 166, 6009, 13215, 6225, 161
https://tests.stockfishchess.org/tests/view/67c4de79685e87e15e7c43f5

Passed LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 244554 W: 62135 L: 62142 D: 120277
Ptnml(0-2): 137, 26612, 68794, 26589, 145
https://tests.stockfishchess.org/tests/view/67c50982685e87e15e7c443d

closes https://github.com/official-stockfish/Stockfish/pull/5928

Bench: 1980385
 2025-03-21 11:16:27 +01:00
FauziAkramandDisservin 5c617e579c VVLTC Search Tune 
Passed VVLTC with STC bounds:
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 15788 W: 4106 L: 3868 D: 7814
Ptnml(0-2): 0, 1324, 5009, 1560, 1
https://tests.stockfishchess.org/tests/view/67bf2ddd6e569f6234102ade

Passed VVLTC with LTC bounds:
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 13622 W: 3620 L: 3368 D: 6634
Ptnml(0-2): 3, 1190, 4170, 1448, 0
https://tests.stockfishchess.org/tests/view/67c04308c8f7c4c0632d8055

closes https://github.com/official-stockfish/Stockfish/pull/5910

Bench: 1823605
 2025-02-27 20:40:56 +01:00
FauziAkramandDisservin a730b4d08b Remove two unnecessary divisions 
Passed STC:
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 280768 W: 72187 L: 72236 D: 136345
Ptnml(0-2): 815, 33131, 72550, 33064, 824
https://tests.stockfishchess.org/tests/view/67bcf7afe670525923b8a101

Passed LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 108684 W: 27666 L: 27536 D: 53482
Ptnml(0-2): 40, 11768, 30606, 11878, 50
https://tests.stockfishchess.org/tests/view/67be472ed8d5c2c657c52cb8

closes https://github.com/official-stockfish/Stockfish/pull/5908

Bench: 2400689
 2025-02-27 20:34:49 +01:00
FauziAkramandDisservin 93b966829b Simplify bestvalue update formula 
Passed STC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 124960 W: 32598 L: 32472 D: 59890
Ptnml(0-2): 480, 14852, 31694, 14970, 484
https://tests.stockfishchess.org/tests/view/67b348bae00eea114cdba37d

Passed LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 150306 W: 38220 L: 38132 D: 73954
Ptnml(0-2): 98, 16430, 42005, 16526, 94
https://tests.stockfishchess.org/tests/view/67b5e37918a66624a7a3f751

closes https://github.com/official-stockfish/Stockfish/pull/5898

Bench: 2146010
 2025-02-24 19:16:26 +01:00
FauziAkramandDisservin 095d19afea Use neon_m128_reduce_add_epi32 for NEON vector reduction 
Accomplishing the entire horizontal addition in a single NEON instruction

closes https://github.com/official-stockfish/Stockfish/pull/5885

No functional change
 2025-02-24 19:07:29 +01:00
FauziAkramandDisservin ee7259e48b Small code cleanup 
Use std::is_arithmetic_v as it is the more modern and concise way to
check for arithmetic types. While at it, fixing a static assert in
misc.h, thanks to Shawn and Disservin for helping.

closes https://github.com/official-stockfish/Stockfish/pull/5883

No functional change
 2025-02-24 19:04:59 +01:00
FauziAkramandDisservin fa6c30af81 FutilityValue formula tweak 
Passed STC:
LLR: 2.95 (-2.94,2.94) <0.00,2.00>
Total: 29600 W: 7979 L: 7662 D: 13959
Ptnml(0-2): 138, 3446, 7324, 3745, 147
https://tests.stockfishchess.org/tests/view/67ac7dff52879dfd14d7e7da

Passed LTC:
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 49662 W: 12850 L: 12502 D: 24310
Ptnml(0-2): 41, 5354, 13689, 5710, 37
https://tests.stockfishchess.org/tests/view/67acc1b252879dfd14d7e81d

closes https://github.com/official-stockfish/Stockfish/pull/5879

Bench: 2581469
 2025-02-13 20:18:35 +01:00
FauziAkramandDisservin 67573218e1 VVLTC parameters tweak 
Some notes:
- Both tests were conducted on top of #5848.
- Based on tuning suggestions, the extension for capturing the
  previously moved piece was removed/simplified. (Developers can attempt
  to reintroduce it post-merge if needed.)
- Initially, bonusScale = std::max(bonusScale, -2); was included but
  later removed in the second test upon Viz's request, however, it was
  nearly non-functional anyway.

Passed VVLTC under STC bounds:
LLR: 2.95 (-2.94,2.94) <0.00,2.00>
Total: 31508 W: 8153 L: 7895 D: 15460
Ptnml(0-2): 1, 2747, 10005, 2995, 6
https://tests.stockfishchess.org/tests/view/679fdc7a0774dfd78deb1350

Passed VVLTC under LTC bounds:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 55026 W: 14370 L: 14046 D: 26610
Ptnml(0-2): 7, 4957, 17262, 5279, 8
https://tests.stockfishchess.org/tests/view/679fec920774dfd78deb19b8

closes https://github.com/official-stockfish/Stockfish/pull/5856

Bench: 2757788
 2025-02-04 21:34:08 +01:00
FauziAkramandDisservin f50d52aa7f No Ply Restriction in the condition that limits the depth extension to a certain point 
No Ply Restriction in the condition that limits the depth extension to a
certain point.

Passed again LTC rebased:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 195108 W: 49916 L: 49872 D: 95320
Ptnml(0-2): 170, 21846, 53464, 21918, 156
https://tests.stockfishchess.org/tests/view/6795542a406a4efe9eb7d361

closes https://github.com/official-stockfish/Stockfish/pull/5824

Bench: 1767398
 2025-01-26 22:53:34 +01:00
FauziAkramandDisservin 69be04d38e Simplify cutoffCnt 
Passed STC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 235872 W: 61156 L: 61155 D: 113561
Ptnml(0-2): 843, 28269, 59658, 28376, 790
https://tests.stockfishchess.org/tests/view/6794dd3e4f7de645171fb380

Passed LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 61494 W: 15644 L: 15462 D: 30388
Ptnml(0-2): 61, 6822, 16788, 7026, 50
https://tests.stockfishchess.org/tests/view/6794f86a406a4efe9eb7d093

closes https://github.com/official-stockfish/Stockfish/pull/5821

Bench: 2168937
 2025-01-26 22:39:32 +01:00
FauziAkramandJoost VandeVondele aa894c0f93 Comments Tweak 
* Remove from comments, hardcoded exact values for parameters that are subject to tuning.
* Remove the Elo worth, as they are now completely outdated, making them irrelevant and potentially misleading.
* Consolidated scaling-related comments into a single section for clarity. Used asterisks (*) to highlight parameters significantly affected by scaling, given their separation in the code.

closes https://github.com/official-stockfish/Stockfish/pull/5810

No functional change
 2025-01-25 20:29:40 +01:00
FauziAkramandJoost VandeVondele c94bcf62e4 Moving up the if position is or has been on the PV reduction 
Passed STC:
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 29664 W: 7880 L: 7570 D: 14214
Ptnml(0-2): 93, 3487, 7390, 3741, 121
https://tests.stockfishchess.org/tests/view/678ac957c00c743bc9e9fc3f

Passed LTC:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 81354 W: 20903 L: 20487 D: 39964
Ptnml(0-2): 66, 9003, 22123, 9419, 66
https://tests.stockfishchess.org/tests/view/678ad359c00c743bc9e9fcfa

closes https://github.com/official-stockfish/Stockfish/pull/5794

Bench: 1414638
 2025-01-18 21:18:48 +01:00
FauziAkramandJoost VandeVondele 165ace194f Remove the cap from maxscale for x moves in y seconds TC 
Passed STC 40/10:
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 48800 W: 13044 L: 12835 D: 22921
Ptnml(0-2): 229, 5457, 12863, 5578, 273
https://tests.stockfishchess.org/tests/view/67862dae460e2910c51de7c9

Passed LTC 40/40:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 141296 W: 36110 L: 36014 D: 69172
Ptnml(0-2): 222, 14350, 41440, 14382, 254
https://tests.stockfishchess.org/tests/view/678799903b8f206a2696b6f8

Passed STC 80/8:
LLR: 2.99 (-2.94,2.94) <-1.75,0.25>
Total: 155120 W: 41442 L: 41346 D: 72332
Ptnml(0-2): 953, 17232, 41102, 17312, 961
https://tests.stockfishchess.org/tests/view/678aca4dc00c743bc9e9fc47

Passed LTC 80/60:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 93950 W: 24042 L: 23904 D: 46004
Ptnml(0-2): 80, 9020, 28627, 9178, 70
https://tests.stockfishchess.org/tests/view/678af705c00c743bc9e9fe94

closes https://github.com/official-stockfish/Stockfish/pull/5790

No functional change
 2025-01-18 20:58:41 +01:00
FauziAkramandJoost VandeVondele 69ec5dcbfc Remove the type of moved piece from the evasion capture movepick formula 
In the move generation the moves are generated in the order pawns, knight, bishops, rooks, queens and king.
This follows increasing type_of(pos.moved_piece(m)) term, so in master a capturing was sorted after a capturing rook if the same piece was captured in evasion.
Because we use a stable sorting method (stable means the order of elements with the same value are not changed) and generate the moves in the above order we do'nt need the removed term.

Passed STC:
LLR: 2.98 (-2.94,2.94) <-1.75,0.25>
Total: 170560 W: 44222 L: 44148 D: 82190
Ptnml(0-2): 569, 18792, 46488, 18858, 573
https://tests.stockfishchess.org/tests/view/678530ee460e2910c51de21d

closes https://github.com/official-stockfish/Stockfish/pull/5784

No functional change
 2025-01-18 20:44:04 +01:00
FauziAkramandDisservin c085670b84 Increase the depth margin 
Tested at VVLTC against the passed patches.

Test 1 against PR5764
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 167260 W: 43053 L: 42521 D: 81686
Ptnml(0-2): 7, 15272, 52542, 15800, 9
https://tests.stockfishchess.org/tests/view/6782ef196ddf09c0b4b6e780

Test 2 against PR5765
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 300012 W: 77364 L: 76771 D: 145877
Ptnml(0-2): 22, 27555, 94256, 28154, 19
https://tests.stockfishchess.org/tests/view/678366446ddf09c0b4b7028c

closes https://github.com/official-stockfish/Stockfish/pull/5768

Bench: 1379150
 2025-01-12 21:36:39 +01:00
FauziAkramandDisservin a04b07265f Make reductionScale smoother 
Making the second part of the formula smoother, changing it to a linear
function, increasing steadily as reductionScale increases and at the
same time, it should be a little bit simpler, therefore the
simplification bounds.

Passed STC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 83040 W: 21493 L: 21322 D: 40225
Ptnml(0-2): 252, 9848, 21209, 9899, 312
https://tests.stockfishchess.org/tests/view/6762145486d5ee47d9543242

Passed LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 230124 W: 58485 L: 58478 D: 113161
Ptnml(0-2): 175, 25620, 63484, 25589, 194
https://tests.stockfishchess.org/tests/view/6762d4ef86d5ee47d9543367

closes https://github.com/official-stockfish/Stockfish/pull/5725

Bench: 1204658
 2024-12-22 15:24:09 +01:00
FauziAkramandDisservin d5a36a3c92 Simplify probCutBeta formula 
After recent changes to the improving definition, seems like there is no
need anymore to keep opponentWorsening in the probCutBeta formula.

Passed STC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 214272 W: 55566 L: 55541 D: 103165
Ptnml(0-2): 620, 25540, 54817, 25513, 646
https://tests.stockfishchess.org/tests/view/6735243d86d5ee47d953eaea

Passed LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 126708 W: 32329 L: 32216 D: 62163
Ptnml(0-2): 68, 13986, 35123, 14119, 58
https://tests.stockfishchess.org/tests/view/67393cf686d5ee47d953ef99

closes https://github.com/official-stockfish/Stockfish/pull/5697

Bench: 983067
 2024-12-08 19:49:01 +01:00
FauziAkramandDisservin 0282edc0b0 Simplify bonus formula 
Give full bonus instead of half.

Passed STC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 23872 W: 6254 L: 6018 D: 11600
Ptnml(0-2): 80, 2691, 6152, 2939, 74
https://tests.stockfishchess.org/tests/view/673b709686d5ee47d953f19d

Passed LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 42894 W: 10924 L: 10725 D: 21245
Ptnml(0-2): 30, 4592, 12011, 4777, 37
https://tests.stockfishchess.org/tests/view/673bb50386d5ee47d953f1eb

closes https://github.com/official-stockfish/Stockfish/pull/5683

Bench: 836558
 2024-11-22 23:23:42 +01:00
FauziAkramandDisservin ce2d9e27ea Simplify big-net reevaluation 
Passed STC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 37408 W: 9699 L: 9477 D: 18232
Ptnml(0-2): 130, 4326, 9577, 4534, 137
https://tests.stockfishchess.org/tests/view/672ffd8086d5ee47d953e633

Passed LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 151062 W: 38087 L: 37999 D: 74976
Ptnml(0-2): 63, 16686, 41958, 16748, 76
https://tests.stockfishchess.org/tests/view/673087aa86d5ee47d953e66b

closes https://github.com/official-stockfish/Stockfish/pull/5674

Bench: 848812
 2024-11-13 20:35:02 +01:00
FauziAkramandDisservin 54cf226604 Revert VLTC regression from #5634 
https://tests.stockfishchess.org/tests/view/671bf61b86d5ee47d953cf23

And thanks to @xu-shawn for suggesting running a VLTC regress test since
depth modifications affect scaling. Also, the LTC was showing a slight
regress after 680+k games  ~= -0.34 , for reference:
https://tests.stockfishchess.org/tests/view/67042b1f86d5ee47d953be7c

closes https://github.com/official-stockfish/Stockfish/pull/5663

Bench: 1307308
 2024-11-13 20:09:13 +01:00
FauziAkramandDisservin 8681d3c2b3 Simplify Time Management Formula 
Decreasing the number of operations
Passed STC:
LLR: 2.97 (-2.94,2.94) <-1.75,0.25>
Total: 38880 W: 10038 L: 9823 D: 19019
Ptnml(0-2): 92, 4334, 10395, 4505, 114
https://tests.stockfishchess.org/tests/view/67112bf586d5ee47d953c6be

Passed LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 242844 W: 61425 L: 61431 D: 119988
Ptnml(0-2): 145, 25175, 70797, 25151, 154
https://tests.stockfishchess.org/tests/view/6712387486d5ee47d953c737

closes https://github.com/official-stockfish/Stockfish/pull/5655

Bench: 1281912
 2024-10-31 10:07:24 +01:00
FauziAkramandDisservin 2ce47573b4 Remove -stat_malus(newDepth) 
Passed STC:
LLR: 2.97 (-2.94,2.94) <-1.75,0.25>
Total: 92544 W: 23940 L: 23778 D: 44826
Ptnml(0-2): 286, 10936, 23638, 11154, 258
https://tests.stockfishchess.org/tests/view/670c3d6986d5ee47d953c30b

Passed LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 43164 W: 10986 L: 10786 D: 21392
Ptnml(0-2): 27, 4713, 11905, 4907, 30
https://tests.stockfishchess.org/tests/view/670eda3d86d5ee47d953c51d

closes https://github.com/official-stockfish/Stockfish/pull/5639

Bench: 1281912
 2024-10-31 09:25:59 +01:00
FauziAkramandDisservin b325b2c348 Simplify bestValue formula 
Passed STC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 45888 W: 12051 L: 11841 D: 21996
Ptnml(0-2): 123, 5356, 11807, 5504, 154
https://tests.stockfishchess.org/tests/view/670bb89086d5ee47d953c2d8

Passed LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 51336 W: 13021 L: 12830 D: 25485
Ptnml(0-2): 34, 5594, 14227, 5773, 40
https://tests.stockfishchess.org/tests/view/670c587f86d5ee47d953c31b

closes https://github.com/official-stockfish/Stockfish/pull/5637

Bench: 1192999
 2024-10-31 09:25:59 +01:00
FauziAkramandDisservin 7f386d109e Remove material corrHist 
Passed STC:
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 80832 W: 21150 L: 20975 D: 38707
Ptnml(0-2): 283, 9531, 20598, 9736, 268
https://tests.stockfishchess.org/tests/view/670302fe86d5ee47d953bd68

Passed LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 46008 W: 11621 L: 11423 D: 22964
Ptnml(0-2): 30, 5072, 12606, 5262, 34
https://tests.stockfishchess.org/tests/view/6704074686d5ee47d953be53

Passed LTC Rebased:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 95814 W: 24340 L: 24195 D: 47279
Ptnml(0-2): 71, 10497, 26602, 10690, 47
https://tests.stockfishchess.org/tests/view/670ae1ac86d5ee47d953c262

closes https://github.com/official-stockfish/Stockfish/pull/5636

Bench: 1119774
 2024-10-31 09:25:56 +01:00
FauziAkramandDisservin 2f3e6198e8 Simplify optimism divisor. 
Passed STC:
LLR: 2.97 (-2.94,2.94) <-1.75,0.25>
Total: 139360 W: 36143 L: 36033 D: 67184
Ptnml(0-2): 436, 16456, 35778, 16582, 428
https://tests.stockfishchess.org/tests/view/66fc49c786d5ee47d953b94e

Passed LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 257748 W: 65163 L: 65184 D: 127401
Ptnml(0-2): 173, 28471, 71611, 28442, 177
https://tests.stockfishchess.org/tests/view/66ff01ae86d5ee47d953bb54

Passed LTC against rebased version:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 53610 W: 13691 L: 13501 D: 26418
Ptnml(0-2): 52, 5942, 14605, 6176, 30
https://tests.stockfishchess.org/tests/view/670a9c5c86d5ee47d953c231

closes https://github.com/official-stockfish/Stockfish/pull/5633

Bench: 1282078
 2024-10-31 09:12:34 +01:00
FauziAkramandDisservin 9a21e3e996 Simplify bestvalue formula 
Passed STC:
LLR: 2.97 (-2.94,2.94) <-1.75,0.25>
Total: 163680 W: 42689 L: 42605 D: 78386
Ptnml(0-2): 619, 19555, 41386, 19683, 597
https://tests.stockfishchess.org/tests/view/66f9451386d5ee47d953b7d9

Passed LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 96498 W: 24582 L: 24438 D: 47478
Ptnml(0-2): 62, 10642, 26718, 10744, 83
https://tests.stockfishchess.org/tests/view/66fd765786d5ee47d953ba1c

closes https://github.com/official-stockfish/Stockfish/pull/5622

Bench: 1309815
 2024-10-12 16:30:44 +02:00
FauziAkramandJoost VandeVondele 5d0bb5976e Removed ROOK threatenedByPawn 
Passed STC:
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 56608 W: 14788 L: 14588 D: 27232
Ptnml(0-2): 162, 6763, 14313, 6845, 221
https://tests.stockfishchess.org/tests/view/66e83f9c86d5ee47d953ab1d

Passed LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 175758 W: 44501 L: 44438 D: 86819
Ptnml(0-2): 125, 19489, 48601, 19526, 138
https://tests.stockfishchess.org/tests/view/66e882d486d5ee47d953ab8a

closes https://github.com/official-stockfish/Stockfish/pull/5601

bench: 1241271
 2024-09-28 17:17:14 +02:00
FauziAkramandDisservin 4fb04eb3df Simplify history bonus 
After we recently added the disallowance for negative bonuses, it is no
longer necessary to keep the max comparison in the previous step.

Passed STC:
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 72000 W: 18820 L: 18637 D: 34543
Ptnml(0-2): 267, 8489, 18276, 8730, 238
https://tests.stockfishchess.org/tests/view/66ce132cbf8c9d8780fdabe7

Passed LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 67452 W: 17136 L: 16961 D: 33355
Ptnml(0-2): 35, 7489, 18519, 7632, 51
https://tests.stockfishchess.org/tests/view/66cf6ad49de3e7f9b33d1010

closes https://github.com/official-stockfish/Stockfish/pull/5554

Bench: 1147012
 2024-09-09 17:34:31 +02:00
FauziAkramandJoost VandeVondele 451044202a Simpler formula for ss->cutoffCnt update 
closes https://github.com/official-stockfish/Stockfish/pull/5548

No functional change
 2024-08-28 09:35:21 +02:00