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Author SHA1 Message Date
FauziAkram
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
Daniel Monroe
27e747d1d7 Simplify futility margin in lmr for quiets. 
Replace the "low bestValue condition" with whether there is a best move.

Passed Simplification STC
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 102560 W: 26517 L: 26367 D: 49676
Ptnml(0-2): 328, 12223, 26036, 12357, 336
https://tests.stockfishchess.org/tests/view/679310e4ca18a2c66da02af8

Passed Simplification LTC
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 66942 W: 17130 L: 16953 D: 32859
Ptnml(0-2): 52, 7459, 18290, 7600, 70
https://tests.stockfishchess.org/tests/view/679459a3e96bfb672ad18ddf

closes https://github.com/official-stockfish/Stockfish/pull/5820

Bench: 1438043
 2025-01-25 20:59:33 +01:00
Stefan Geschwentner
1b31e266b0 Consider more nodes as ttPv nodes. 
Remove depth condition in propagation rule for ttPv state from a node to
it childs.

Because this change marks more nodes as ttPv, we have a time sensitive
ttPv reduction rule and the STC snd LTC seems to show bad scaling. So i
have also submitted a VLTC non-regression to check the scaling at higher
time control.

The results gives a little indication that we have perhaps good scaling
with more ttPv nodes so that could be further explored.

Passed non-regression STC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 82528 W: 21627 L: 21453 D: 39448
Ptnml(0-2): 317, 9809, 20891, 9877, 370
https://tests.stockfishchess.org/tests/view/678e608cd63764e34db49ad7

Passed non-regression LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 310440 W: 78879 L: 78956 D: 152605
Ptnml(0-2): 255, 34915, 84938, 34876, 236
https://tests.stockfishchess.org/tests/view/678fab89ac8f8f5496155f3c

Passed non-regression VLTC for scaling verification:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 59496 W: 15158 L: 14983 D: 29355
Ptnml(0-2): 15, 6039, 17470, 6204, 20
https://tests.stockfishchess.org/tests/view/6794bd1f4f7de645171fb33b

closes https://github.com/official-stockfish/Stockfish/pull/5819

Bench: 1829507
 2025-01-25 20:56:14 +01:00
Shawn Xu
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
Viren6
435ba3dbb5 Revert "Moving up the if position is or has been on the PV reduction" 
Passed VVLTC 1:
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 68362 W: 17830 L: 17523 D: 33009
Ptnml(0-2): 9, 6253, 21347, 6566, 6
https://tests.stockfishchess.org/tests/view/6790271cfc8c306ba6cea2c1

Passed VVLTC 2:
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 113256 W: 29158 L: 28721 D: 55377
Ptnml(0-2): 13, 10521, 35122, 10960, 12
https://tests.stockfishchess.org/tests/view/678d3e47d63764e34db491a3

closes https://github.com/official-stockfish/Stockfish/pull/5815

bench 1943998
 2025-01-25 20:51:31 +01:00
Robert Nurnberg @ elitebook
6c7c5c7e47 Do not change TB cursed wins to draws if requested 
If Syzygy50MoveRule is false, do not calls to is_draw() need to be guarded.
Also fixes a TB rootmove ranking issue in this case.

closes https://github.com/official-stockfish/Stockfish/pull/5814

No functional change
 2025-01-25 20:42:50 +01:00
pkrisz99
75b75bc16a Add improving to a condition of NMP 
This patch makes one of the conditions for null-move pruning depend on whether we're improving. Keep in mind that it relies on the "classical" definiton, rather than the refined one.

Passed STC: https://tests.stockfishchess.org/tests/view/678d5267d63764e34db49720
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 38976 W: 10296 L: 9974 D: 18706
Ptnml(0-2): 135, 4504, 9902, 4798, 149

Passed LTC: https://tests.stockfishchess.org/tests/view/678d5891d63764e34db49731
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 275772 W: 70655 L: 69836 D: 135281
Ptnml(0-2): 217, 30615, 75394, 31452, 208

closes https://github.com/official-stockfish/Stockfish/pull/5813

Bench: 2475787
 2025-01-25 20:41:37 +01:00
Shawn Xu
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
FauziAkram
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
Nonlinear2
4975b2bc6f Increase prior countermove bonus if TT move 
Passed STC:
https://tests.stockfishchess.org/tests/view/678c4c8bf4dc0a8b4ae8db5c
LLR: 2.97 (-2.94,2.94) <0.00,2.00>
Total: 273408 W: 71089 L: 70415 D: 131904
Ptnml(0-2): 937, 32466, 69229, 33130, 942

Passed LTC:
https://tests.stockfishchess.org/tests/view/678ccabdf4dc0a8b4ae8dd7a
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 148614 W: 38138 L: 37584 D: 72892
Ptnml(0-2): 97, 16450, 40689, 16944, 127

closes https://github.com/official-stockfish/Stockfish/pull/5809

Bench: 1582867
 2025-01-25 20:27:11 +01:00
Stefan Geschwentner
59c578ad28 Add move count based reduction. 
Do less reduction which is linear increasing with move count (factor = 64).

Passed STC:
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 191488 W: 49982 L: 49432 D: 92074
Ptnml(0-2): 731, 22523, 48614, 23217, 659
https://tests.stockfishchess.org/tests/view/678d0b29d63764e34db4904b

Passed LTC:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 90582 W: 23150 L: 22717 D: 44715
Ptnml(0-2): 73, 9936, 24822, 10405, 55
https://tests.stockfishchess.org/tests/view/678d347cd63764e34db4916f

closes https://github.com/official-stockfish/Stockfish/pull/5807

Bench: 1803474
 2025-01-25 20:23:33 +01:00
Shawn Xu
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
mstembera
18b3465a86 Generate lookup indices at compile time. 
Credit to @Disservin: the constexpr lsb is just the De Bruijn bitscan with the xor from the cpw https://www.chessprogramming.org/BitScan

closes https://github.com/official-stockfish/Stockfish/pull/5801

No functional change
 2025-01-25 20:12:38 +01:00
Shawn Xu
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
Joost VandeVondele
8e3e22b3d4 Replace depth increase condition with !opponentWorsening 
Passed simplification STC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 220544 W: 57417 L: 57399 D: 105728
Ptnml(0-2): 816, 26554, 55540, 26520, 842
https://tests.stockfishchess.org/tests/view/678970e38082388fa0cbfe02

Passed simplification LTC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 132600 W: 33868 L: 33760 D: 64972
Ptnml(0-2): 126, 14770, 36390, 14898, 116
https://tests.stockfishchess.org/tests/view/678accabc00c743bc9e9fc7f

closes https://github.com/official-stockfish/Stockfish/pull/5798

bench 1632964
 2025-01-18 21:33:17 +01:00
Daniel Monroe
f00d91f8ac Refine probcut 
Allow probcut for depth 3 and disable deeper verification search when it would simply repeat the qsearch.

Passed STC
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 283232 W: 74450 L: 73760 D: 135022
Ptnml(0-2): 1052, 33780, 71349, 34296, 1139
https://tests.stockfishchess.org/tests/view/67843b58460e2910c51ddcc6

Passed LTC
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 339654 W: 86845 L: 85893 D: 166916
Ptnml(0-2): 298, 37734, 92802, 38704, 289
https://tests.stockfishchess.org/tests/view/678aa722c00c743bc9e9face

closes https://github.com/official-stockfish/Stockfish/pull/5797

bench 1288648
 2025-01-18 21:27:42 +01:00
Shawn Xu
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
FauziAkram
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
mstembera
329c267e25 Optimize find_nnz() by reducing the size of lookup_indices 
https://tests.stockfishchess.org/tests/view/67896b688082388fa0cbfdee
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 452800 W: 118213 L: 117300 D: 217287
Ptnml(0-2): 1638, 50255, 121864, 50842, 1801

It's faster to shrink lookup_indices[] to 8 bit and zero extend to 16 bit using _mm_cvtepu8_epi16() than to read the larger 16 bit version. I suspect that having the constants available at compile time isn't too valuable and can be simplified back to generating at initialization time since this version also almost passed. https://tests.stockfishchess.org/tests/view/67863057460e2910c51de7e0 I will try that as a follow up.

closes https://github.com/official-stockfish/Stockfish/pull/5793

No functional change
 2025-01-18 21:13:12 +01:00
Michael Chaly
7701d0b3c4 Introduce one more continuation history 
This one is counter counter counter history - with really low update value and divided by 3 in movepicker unlike the other ones.

Passed STC:
https://tests.stockfishchess.org/tests/view/67861495460e2910c51de720
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 44352 W: 11699 L: 11370 D: 21283
Ptnml(0-2): 156, 5098, 11361, 5383, 178

Passed LTC:
https://tests.stockfishchess.org/tests/view/6786e89e3b8f206a2696b646
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 432660 W: 110355 L: 109207 D: 213098
Ptnml(0-2): 381, 48214, 118039, 49268, 428

closes https://github.com/official-stockfish/Stockfish/pull/5792

Bench: 1491837
 2025-01-18 21:04:55 +01:00
Nonlinear2
b392ac76db Increase history bonus of TT moves 
Passed STC:
https://tests.stockfishchess.org/tests/view/678807653b8f206a2696b78b
LLR: 2.96 (-2.94,2.94) <0.00,2.00>
Total: 42208 W: 11113 L: 10783 D: 20312
Ptnml(0-2): 148, 4919, 10651, 5227, 159

Passed LTC:
https://tests.stockfishchess.org/tests/view/6788a8463b8f206a2696b956
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 122886 W: 31454 L: 30952 D: 60480
Ptnml(0-2): 105, 13567, 33619, 14025, 127

closes https://github.com/official-stockfish/Stockfish/pull/5791

Bench: 1760081
 2025-01-18 21:02:04 +01:00
FauziAkram
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
ppigazzini
4423c8eefa Return stockfish-macos-m1-apple-silicon.tar 
https://github.com/[ppigazzini/stockfish-downloader now uses the official SF script for POSIX systems.

closes https://github.com/official-stockfish/Stockfish/pull/5789

No functional change
 2025-01-18 20:56:23 +01:00
Shawn Xu
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
Disservin
132b90df04 Update CI to Ubuntu 22.04 from 20.04 
fixes #5756
closes https://github.com/official-stockfish/Stockfish/pull/5786

No functional change
 2025-01-18 20:52:07 +01:00
Daniel Monroe
a944f08225 retroactive reduction decrease if eval improves 
If the previous reduction was large but the static eval improves then increase the search depth. This patch looks at the next node when calculating the reduction, something I don't think has been done before and which can probably used for further elo gaining patches.

Passed STC
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 55936 W: 14813 L: 14462 D: 26661
Ptnml(0-2): 220, 6565, 14094, 6822, 267
https://tests.stockfishchess.org/tests/view/67845b70460e2910c51ddcff

Passed LTC
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 189468 W: 48411 L: 47773 D: 93284
Ptnml(0-2): 180, 20801, 52131, 21445, 177
https://tests.stockfishchess.org/tests/view/6784e2cb460e2910c51ddf86

closes https://github.com/official-stockfish/Stockfish/pull/5785

bench: 1512884
 2025-01-18 20:50:04 +01:00
FauziAkram
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
pb00067
56000827af Simplify common hint for parent position 
Removes function hint_common_access_for_perspective together with it's comments,
which weren't accurate anymore since merge of #5576

https://tests.stockfishchess.org/tests/view/6784c9cd460e2910c51dde39
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 295104 W: 76702 L: 76765 D: 141637
Ptnml(0-2): 1031, 32135, 81249, 32140, 997

closes https://github.com/official-stockfish/Stockfish/pull/5780

No functional change
 2025-01-18 20:35:46 +01:00
Disservin
4c2241089d Remove addition of 1ms to all timestamps 
The +1 was a quick fix to avoid the division by zero, a more correct approach is to use 1ms as the minimum reported timestamp to avoid a division by zero.
Later timestamps no longer include an additional 1ms.

closes https://github.com/official-stockfish/Stockfish/pull/5778

No functional change
 2025-01-18 20:32:00 +01:00
Disservin
675319b45d Fix Path to AUTHORS in CONTRIBUTING 
closes https://github.com/official-stockfish/Stockfish/pull/5777

No functional change
 2025-01-18 20:30:44 +01:00
Daniel Monroe
5868b4cb58 remove eval== staticeval check in fut pruning 
Simplify corrplexity in futility margin
Don't check that staticEval == eval when applying the corrplexity-based adjustment in futility pruning.

Passed Simplification STC
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 121760 W: 31640 L: 31512 D: 58608
Ptnml(0-2): 349, 14400, 31289, 14458, 384
https://tests.stockfishchess.org/tests/view/6780c4109168c8bf30927777

Passed Simplification LTC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 134772 W: 34245 L: 34140 D: 66387
Ptnml(0-2): 94, 14869, 37350, 14984, 89
https://tests.stockfishchess.org/tests/view/6782d6ea6ddf09c0b4b6dd36

closes https://github.com/official-stockfish/Stockfish/pull/5776

Bench: 1487627
 2025-01-18 20:25:59 +01:00
mstembera
3104cd72d5 Fix initialization of TTData. 
https://tests.stockfishchess.org/tests/view/6757757686d5ee47d9541de9
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 151200 W: 39396 L: 39306 D: 72498
Ptnml(0-2): 445, 16404, 41781, 16556, 414

Discussed in more detail here #5766

closes https://github.com/official-stockfish/Stockfish/pull/5773

No functional change
 2025-01-18 20:23:10 +01:00
Carlos Esparza
aaafaaecf2 prefetch in do_move() 
this allows removing Position::key_after()

STC
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 24960 W: 6556 L: 6336 D: 12068
Ptnml(0-2): 59, 2554, 7056, 2730, 81

LTC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 115080 W: 29319 L: 29204 D: 56557
Ptnml(0-2): 51, 10736, 35864, 10825, 64

STC with 2MB hash
LLR: 3.04 (-2.94,2.94) <-1.75,0.25>
Total: 182176 W: 46998 L: 46932 D: 88246
Ptnml(0-2): 526, 19711, 50544, 19785, 522

LTC with 8MB hash
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 441180 W: 111557 L: 111746 D: 217877
Ptnml(0-2): 229, 39698, 140929, 39501, 233

closes https://github.com/official-stockfish/Stockfish/pull/5770

bench: 1379150
 2025-01-18 20:19:53 +01:00
FauziAkram
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
Viren6
e2612f9a29 Introduce Correction History Quad Extensions 
Also modifies the double and triple extension margins with the correction history adjustment.

STC Elo Estimate:
Elo: -4.40 ± 1.4 (95%) LOS: 0.0%
Total: 60000 W: 15230 L: 15990 D: 28780
Ptnml(0-2): 264, 7495, 15168, 6883, 190
nElo: -8.48 ± 2.8 (95%) PairsRatio: 0.91
https://tests.stockfishchess.org/tests/view/6783a3786ddf09c0b4b703a1

Passed 1st VVLTC:
LLR: 2.95 (-2.94,2.94) <0.00,2.00>
Total: 35736 W: 9354 L: 9088 D: 17294
Ptnml(0-2): 4, 3191, 11212, 3457, 4
https://tests.stockfishchess.org/tests/view/6783a3336ddf09c0b4b7039b

Passed 2nd VVLTC:
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 36394 W: 9515 L: 9225 D: 17654
Ptnml(0-2): 1, 3271, 11364, 3559, 2
https://tests.stockfishchess.org/tests/view/678395e26ddf09c0b4b70345

closes https://github.com/official-stockfish/Stockfish/pull/5767

Bench: 1567166
 2025-01-12 21:36:39 +01:00
Muzhen Gaming
93edf7a74c VVLTC Search Tune 
Values were tuned with 118k VVLTC games.

Tested against #5764.

Passed VVLTC 1st sprt:
https://tests.stockfishchess.org/tests/view/678331226ddf09c0b4b6fd78
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 43556 W: 11219 L: 10942 D: 21395
Ptnml(0-2): 2, 3975, 13549, 4248, 4

Passed VVLTC 2nd sprt:
https://tests.stockfishchess.org/tests/view/67834aa06ddf09c0b4b6fe34
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 37150 W: 9577 L: 9285 D: 18288
Ptnml(0-2): 2, 3344, 11593, 3632, 4

closes https://github.com/official-stockfish/Stockfish/pull/5765

Bench: 1258128
 2025-01-12 21:36:31 +01:00
Michael Chaly
8b32e4825f Make IIR less aggressive 
This patch is an elo gaining simplification which gains elo at longer time controls.
Patch disallows IIR for cutNodes with existing tt moves as well as makes
IIR for pv nodes less aggressive, basiclally confirming suspected
scaling patterns for this heuristic.

Result of 50k games STC run:
https://tests.stockfishchess.org/tests/view/678304676ddf09c0b4b6f9f9
Elo: -2.93 ± 1.6 (95%) LOS: 0.0%
Total: 50000 W: 12718 L: 13140 D: 24142
Ptnml(0-2): 189, 6087, 12835, 5735, 154
nElo: -5.71 ± 3.0 (95%) PairsRatio: 0.94

Passed VVLTC SPRT with STC bounds:
https://tests.stockfishchess.org/tests/view/6782eb1a6ddf09c0b4b6e6b0
LLR: 2.95 (-2.94,2.94) <0.00,2.00>
Total: 150292 W: 38868 L: 38458 D: 72966
Ptnml(0-2): 19, 13890, 46907, 14322, 8

Passed VVLTC SPRT with LTC bounds:
https://tests.stockfishchess.org/tests/view/6782d8d96ddf09c0b4b6df18
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 153388 W: 39791 L: 39285 D: 74312
Ptnml(0-2): 13, 13924, 48311, 14436, 10

closes https://github.com/official-stockfish/Stockfish/pull/5763

Bench: 1507606
 2025-01-12 21:25:36 +01:00
mstembera
b84c8807a3 Optimize attackers_to() 
https://tests.stockfishchess.org/tests/view/6782decb6ddf09c0b4b6e1b0
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 105920 W: 27571 L: 27181 D: 51168
Ptnml(0-2): 284, 10808, 30403, 11164, 301

- If we only need to know if attackers exist we can skip some
  calculations.
- Also calculating slider/magic attackers first is better because the
  double lookup is slow due to memory latency.
- I also included a couple of very minor cleanups in search that
  probably don't warrant their own PR but I can open separately if
  that's better.

closes https://github.com/official-stockfish/Stockfish/pull/5762

No functional change
 2025-01-12 21:24:44 +01:00
Shawn Xu
921361829a Simplify away capthist bonus in Probcut 
The explicit bonus has been obsoleted with the introduction of #5695

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

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

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

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

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

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

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

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

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

No functional change
 2025-01-12 21:21:53 +01:00
Shawn Xu
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
Disservin
ea71a08843 Improve Instrumented Python Testing Script 
For betting debugging and earlier stop in case of termination, like in
https://github.com/official-stockfish/Stockfish/pull/5754#issuecomment-2576120357

closes https://github.com/official-stockfish/Stockfish/pull/5755

No functional change
 2025-01-12 21:18:08 +01:00
Maxim Masiutin
d49fd9090b Add .gitattributes for script LE 
closes https://github.com/official-stockfish/Stockfish/pull/5753

No functional change
 2025-01-12 21:16:32 +01:00
pb00067
c88a5b3950 Simplify away hint for common parent position at probcut 
Since it's introduction at probcut step the nnue network has changed
substantially and now it no longer seems useful.

Passed non-regression test at STC
https://tests.stockfishchess.org/tests/view/675fe27986d5ee47d9542d86
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 118656 W: 30732 L: 30609 D: 57315
Ptnml(0-2): 319, 12767, 33049, 12858, 335

N.B.: It may be useful to reintroduce it here at probcut if we know that
a node that was cut away previously now has to be explored. Exploring
new ground will deliver no tt-hits so in this case the hint for common
parent position might be useful.

No functional change
 2025-01-12 21:15:35 +01:00
Shawn Xu
403a5e100b Simplify Fail-Low Bonus 
Passed Non-regression STC:
LLR: 2.92 (-2.94,2.94) <-1.75,0.25>
Total: 66592 W: 17426 L: 17239 D: 31927
Ptnml(0-2): 208, 7812, 17109, 7919, 248
https://tests.stockfishchess.org/tests/view/6774e1711a2f267f20548b22

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

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

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

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

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

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

No functional change
 2025-01-12 21:11:59 +01:00
Shawn Xu
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
sscg13
7858f9dfdc Use same pawn value in both nets when doing material scaling of eval 
Passed Non-regression STC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 221312 W: 57291 L: 57274 D: 106747
Ptnml(0-2): 760, 26152, 56841, 26117, 786
https://tests.stockfishchess.org/tests/view/676e2a101a2f267f20548453

Passed Non-regression LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 176808 W: 45084 L: 45023 D: 86701
Ptnml(0-2): 112, 19418, 49286, 19473, 115
https://tests.stockfishchess.org/tests/view/676f424d1a2f267f2054857f

closes https://github.com/official-stockfish/Stockfish/pull/5741

Bench: 1121800
 2025-01-12 21:09:58 +01:00
Daniel Monroe
c76c179361 Remove non-functional std::min() 
closes https://github.com/official-stockfish/Stockfish/pull/5749

No functional change
 2025-01-06 00:48:05 +01:00