Timothy Herchen and Joost VandeVondele
fa4f05d3ef
Don't copy around DirtyThreats
...
The contents of DirtyThreats gets memcpyed twice for each call to do_move.
(Return value optimization doesn't apply to the do_move function itself because
it constructs a std::pair, so it gets copied; and the calls to reset also
require a copy.) This patch inserts the dirty info in place.
Sometimes the caller of do_move ignores the DirtyThreats info, so we pass in
scratch objects. I found that stack-allocating these scratch objects was bad on
Fishtest, so I begrudgingly put them in the Position struct. Both templating
the do_move function on whether dirty threats are needed and putting a
null-check branch for each use of dirty threats were slowdowns locally. Of
course, nothing prevents a future attempt at cleaning this up.
passed STC
LLR: 2.96 (-2.94,2.94) <0.00,2.00>
Total: 68448 W: 17770 L: 17418 D: 33260
Ptnml(0-2): 198, 7425, 18630, 7769, 202
https://tests.stockfishchess.org/tests/view/6914c01a7ca87818523318ba
closes https://github.com/official-stockfish/Stockfish/pull/6414
No functional change
2025-11-13 22:17:03 +01:00
Daniel Monroe and Joost VandeVondele
7ac8e62219
Refine constant in correction history update
...
Passed STC
LLR: 3.04 (-2.94,2.94) <0.00,2.00>
Total: 250112 W: 65277 L: 64635 D: 120200
Ptnml(0-2): 841, 29326, 64134, 29860, 895
https://tests.stockfishchess.org/tests/view/69096c46ea4b268f1fac2a39
Passed LTC
LLR: 2.96 (-2.94,2.94) <0.50,2.50>
Total: 142908 W: 37141 L: 36604 D: 69163
Ptnml(0-2): 100, 15478, 39742, 16053, 81
https://tests.stockfishchess.org/tests/view/690e7dfbec1d00d2c195c351
closes https://github.com/official-stockfish/Stockfish/pull/6405
bench 2613869
2025-11-13 22:10:30 +01:00
+1
8e5392d79a
Update NNUE architecture to SFNNv10 with Threat Inputs and net nn-49c1193b131c.nnue
...
This commit introduces Full Threat Input features, which are a subset of Piece(Square)-Piece(Square) pairs. In any given position, the active features consist of pairs where the second piece’s square lies in the attack set of the first piece. This is an extremely simplified explanation that leaves out many details. The already-used HalfKAv2_hm feature set completes the input features.
Minor quantization changes have also been made.
The net nn-49c1193b131c.nnue was trained by vondele using the following setup: https://github.com/vondele/nettest/blob/7de71238e9b295e3f88ed7c9c5936af632c9b981/threats.yaml
A graphical version of an earlier scheme (with less refinement) that illustrates the core concepts can be found attached.
[NewInputs.pdf](https://github.com/user-attachments/files/23478441/NewInputs.pdf )
Further information, as well as a brief description of the history of development, can be found attached.
[Stockfish threat inputs PR summary.pdf](https://github.com/user-attachments/files/23478634/Stockfish.threat.inputs.PR.summary.pdf )
This has been a huge effort spanning over half a year, with the original [discussion thread](https://discord.com/channels/435943710472011776/1336647760388034610 ) reaching over 11k messages. Thanks to everyone who has contributed.
Monty PRs:
https://github.com/official-monty/Monty/pull/87 (Initial threat input PR)
https://github.com/official-monty/Monty/pull/114 (Fixed threat indexing to take into account colour correctly)
https://github.com/official-monty/Monty/pull/116 (i8 quantisation of weights whilst keeping calculations in i16)
Yukari commit:
https://github.com/yukarichess/yukari/commit/2d482c64a79cec03cf4987d5289334b9cdc737bc (Threat inputs merged)
Plentychess PRs:
https://github.com/Yoshie2000/PlentyChess/pull/400 (Threat inputs merged)
https://github.com/Yoshie2000/PlentyChess/pull/411 (Threat input weights quantised to i8)
Passed STC:
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 63424 W: 16956 L: 16591 D: 29877
Ptnml(0-2): 276, 7522, 15797, 7795, 322
https://tests.stockfishchess.org/tests/view/69105b3dec1d00d2c195c569
Passed LTC:
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 27876 W: 7417 L: 7110 D: 13349
Ptnml(0-2): 23, 3033, 7530, 3318, 34
https://tests.stockfishchess.org/tests/view/6910d817ec1d00d2c195c66e
Passed VVLTC (Hash accidentally set to 1/2 normal value for both sides):
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 12458 W: 3353 L: 3102 D: 6003
Ptnml(0-2): 0, 1106, 3767, 1355, 1
https://tests.stockfishchess.org/tests/view/69115a26ec1d00d2c195c7cd
This version has also passed non-regression LTC against the originally passed version:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 51144 W: 13086 L: 12903 D: 25155
Ptnml(0-2): 22, 5167, 15018, 5336, 29
https://tests.stockfishchess.org/tests/view/69138a317ca87818523314bf
LTC elo estimate on ARM:
1 patch : 13.9 1.9 38296.5 73728 52
2 master : 0.0 ---- 35431.5 73728 48
closes https://github.com/official-stockfish/Stockfish/pull/6411
bench: 2626086
Co-authored-by: Shawn Xu <xu107288696@gmail.com >
Co-authored-by: Timothy Herchen <timothy.herchen@gmail.com >
Co-authored-by: Viren6 <94880762+Viren6@users.noreply.github.com >
Co-authored-by: Yoshie2000 <patrick.leonhardt@gmx.net >
Co-authored-by: Joost Vandevondele <Joost.VandeVondele@gmail.com >
Co-authored-by: rn5f107s2 <clemens.lerchl@gmail.com >
Co-authored-by: cj5716 <125858804+cj5716@users.noreply.github.com >
Co-authored-by: AliceRoselia <63040919+AliceRoselia@users.noreply.github.com >
Co-authored-by: Linmiao Xu <linmiao.xu@gmail.com >
Co-authored-by: Disservin <disservin.social@gmail.com >
2025-11-12 10:49:39 +01:00
FauziAkram and Joost 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
Shawn Xu and Joost VandeVondele
cd7880c030
Simplify Corrhist Bonus
...
Passed Non-regression STC:
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 187776 W: 48687 L: 48631 D: 90458
Ptnml(0-2): 570, 22327, 48090, 22279, 622
https://tests.stockfishchess.org/tests/view/68f58019637acd2a11e72233
Passed Non-regression LTC:
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 159378 W: 41027 L: 40946 D: 77405
Ptnml(0-2): 122, 17645, 44078, 17718, 126
https://tests.stockfishchess.org/tests/view/68fe7492637acd2a11e73090
closes https://github.com/official-stockfish/Stockfish/pull/6385
Bench: 2458738
2025-11-01 11:36:33 +01:00
Shawn Xu and Joost VandeVondele
0351652995
Simplify Pawn History Bonus
...
Passed Non-regression STC:
LLR: 2.98 (-2.94,2.94) <-1.75,0.25>
Total: 122016 W: 31655 L: 31525 D: 58836
Ptnml(0-2): 388, 14317, 31474, 14435, 394
https://tests.stockfishchess.org/tests/view/68f57e66637acd2a11e7221d
Passed Non-regression LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 81348 W: 21016 L: 20858 D: 39474
Ptnml(0-2): 45, 8793, 22841, 8949, 46
https://tests.stockfishchess.org/tests/view/68f9e2d9637acd2a11e72997
closes https://github.com/official-stockfish/Stockfish/pull/6382
Bench: 2370893
2025-11-01 11:32:53 +01:00
Daniel Monroe and Joost VandeVondele
c9a2aff485
Simplify correction update condition
...
Passed non-regression STC
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 95136 W: 24722 L: 24564 D: 45850
Ptnml(0-2): 307, 11139, 24522, 11289, 311
https://tests.stockfishchess.org/tests/view/68e5034ea017f472e763dc5a
Passed non-regression LTC
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 256440 W: 65854 L: 65873 D: 124713
Ptnml(0-2): 144, 28287, 71375, 28272, 142
https://tests.stockfishchess.org/tests/view/68e71ae4a017f472e763e291
closes https://github.com/official-stockfish/Stockfish/pull/6375
bench 2216361
2025-11-01 11:29:47 +01:00
Daniel Monroe and Joost VandeVondele
013d42914f
Simplify static eval bonus
...
Passed non-regression STC
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 176896 W: 45998 L: 45933 D: 84965
Ptnml(0-2): 609, 20845, 45451, 20958, 585
https://tests.stockfishchess.org/tests/view/68e5e48ba017f472e763dd21
Passed non-regression LTC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 77682 W: 20046 L: 19884 D: 37752
Ptnml(0-2): 41, 8404, 21786, 8572, 38
https://tests.stockfishchess.org/tests/view/68ee71e328e6d77fcff9fd68
closes https://github.com/official-stockfish/Stockfish/pull/6374
bench 2101654
2025-11-01 11:27:27 +01:00
Daniel Monroe and Joost VandeVondele
fd3c563f57
Simplify r50 condition in cutoff
...
Passed non-regression STC
LLR: 3.11 (-2.94,2.94) <-1.75,0.25>
Total: 114560 W: 29832 L: 29689 D: 55039
Ptnml(0-2): 332, 12302, 31869, 12445, 332
https://tests.stockfishchess.org/tests/view/68e38587fa806e2e8393d4a9
Passed non-regression LTC
LLR: 2.99 (-2.94,2.94) <-1.75,0.25>
Total: 256272 W: 65817 L: 65832 D: 124623
Ptnml(0-2): 137, 25528, 76817, 25521, 133
https://tests.stockfishchess.org/tests/view/68e69b47a017f472e763e065
closes https://github.com/official-stockfish/Stockfish/pull/6373
Bench: 2438327
2025-11-01 11:20:23 +01:00
Daniel Monroe and Joost VandeVondele
9e071f3561
Simplify best move effort
...
Passed non-regression STC
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 44224 W: 11614 L: 11403 D: 21207
Ptnml(0-2): 147, 4936, 11726, 5165, 138
https://tests.stockfishchess.org/tests/view/68e9410ed323fd15c04e3a87
Passed non-regression LTC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 109788 W: 28223 L: 28096 D: 53469
Ptnml(0-2): 60, 11493, 31657, 11628, 56
https://tests.stockfishchess.org/tests/view/68eb5ac0a23744016c14af1d
closes https://github.com/official-stockfish/Stockfish/pull/6371
No functional change
2025-11-01 11:18:00 +01:00
pb00067 and Joost VandeVondele
fa3b4ef5af
Improve retrograde analisys and matefinding capability
...
fixes https://github.com/official-stockfish/Stockfish/issues/6328
Before calling search(depth), the patch ensures that depth is at least 1
whenever we encounter a decisive score in the transposition table (TT). This
prevents search(depth) from being executed by qsearch, which would otherwise
ignore that information. Typically, decisive TT hits occur when analyzing a
mating sequence backward. Due to the nature of Iterative Deepening (IID), such
scores are usually first found at depth 0. Without this patch, valuable
information can be lost because qsearch may overwrite the TT entry by replacing
the value with a static evaluation, even though the node was already processed
at a higher depth. This is also why the engine sometimes loses track of an
already discovered mate.
Using ..\sf\patch.exe on matetrack.epd with --nodes 1000000
Engine ID: Stockfish dev-20251015-nogit
Total FENs: 6554
Found mates: 3437
Best mates: 2438
Using ..\sf\master.exe on matetrack.epd with --nodes 1000000
Engine ID: Stockfish dev-20251015-nogit
Total FENs: 6554
Found mates: 3337
Best mates: 2407
Passed STC
https://tests.stockfishchess.org/tests/view/68fa3fa7637acd2a11e72a79
LLR: 3.55 (-2.94,2.94) <0.00,2.00>
Total: 134144 W: 34960 L: 34471 D: 64713
Ptnml(0-2): 376, 14199, 37459, 14636, 402
Failed LTC
https://tests.stockfishchess.org/tests/view/68ffc1b5637acd2a11e73377
LLR: -3.10 (-2.94,2.94) <0.50,2.50>
Total: 75360 W: 19423 L: 19519 D: 36418
Ptnml(0-2): 38, 7553, 22605, 7435, 49
closes https://github.com/official-stockfish/Stockfish/pull/6386
bench: 2530552
2025-11-01 11:02:00 +01:00
shaowyx and Joost VandeVondele
a49b52cf69
Revert malus and associated coefficient parameters resulting from using only quiet moves
...
Following #6226 and #6256 , this patch ultimately corresponds to the revert of #6200 .
Parameters were tuned on 60k LTC games.
STC (10+0.1 th1) was accepted:
LLR: 2.95 (-2.94,2.94) <0.00,2.00>
Total: 167488 W: 43573 L: 43063 D: 80852
Ptnml(0-2): 506, 19644, 43004, 20014, 576
https://tests.stockfishchess.org/tests/view/68f526a4637acd2a11e721c2
LTC (60+0.6 th1) was accepted:
LLR: 2.99 (-2.94,2.94) <0.50,2.50>
Total: 61068 W: 15882 L: 15510 D: 29676
Ptnml(0-2): 31, 6578, 16949, 6940, 36
https://tests.stockfishchess.org/tests/view/68fa1968637acd2a11e72a0a
Non-regression VLTC (180+1.8 th1) was accepted:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 50380 W: 13087 L: 12905 D: 24388
Ptnml(0-2): 5, 5018, 14962, 5200, 5
https://tests.stockfishchess.org/tests/view/68fdc6e5637acd2a11e72f33
closes https://github.com/official-stockfish/Stockfish/pull/6378
Bench: 2530552
2025-11-01 10:48:40 +01:00
Taras Vuk and Joost VandeVondele
b9e3e7921b
Increase NMP reduction when improving
...
Passed STC:
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 52896 W: 13904 L: 13565 D: 25427
Ptnml(0-2): 186, 6022, 13706, 6335, 199
https://tests.stockfishchess.org/tests/view/68e67d02a017f472e763dfaf
Passed LTC:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 168354 W: 43750 L: 43163 D: 81441
Ptnml(0-2): 81, 18284, 46882, 18827, 103
https://tests.stockfishchess.org/tests/view/68e79d7ba017f472e763e352
closes https://github.com/official-stockfish/Stockfish/pull/6361
bench: 2537382
2025-11-01 10:28:02 +01:00
Daniel Monroe and Joost VandeVondele
e7a4708ad5
Remove condition in qsearch
...
Instead of skipping non-captures when pawn history is exceptionally high, skip all non-captures
Passed non-regression STC
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 38016 W: 10018 L: 9795 D: 18203
Ptnml(0-2): 155, 4346, 9755, 4625, 127
https://tests.stockfishchess.org/tests/view/68e43d4aa017f472e763db2e
Passed rebased non-regression LTC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 96048 W: 24854 L: 24710 D: 46484
Ptnml(0-2): 47, 10504, 26780, 10644, 49
https://tests.stockfishchess.org/tests/view/68e59352a017f472e763dcf9
closes https://github.com/official-stockfish/Stockfish/pull/6355
bench 2343840
2025-10-14 17:32:32 +02:00
Daniel Samek and Joost VandeVondele
e18ed795f2
Introduce 4-ply continuation correction history
...
Passed STC:
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 113984 W: 29752 L: 29323 D: 54909
Ptnml(0-2): 376, 13191, 29435, 13608, 382
https://tests.stockfishchess.org/tests/view/68dc3576fa806e2e8393bd93
Passed LTC:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 80154 W: 20823 L: 20417 D: 38914
Ptnml(0-2): 47, 8600, 22383, 8994, 53
https://tests.stockfishchess.org/tests/view/68df83e0fa806e2e8393cbe8
Passed non-regression VLTC (rebased):
LLR: 2.98 (-2.94,2.94) <-1.75,0.25>
Total: 38158 W: 9992 L: 9805 D: 18361
Ptnml(0-2): 3, 3406, 12075, 3591, 4
https://tests.stockfishchess.org/tests/view/68e22f2afa806e2e8393d0ed
closes https://github.com/official-stockfish/Stockfish/pull/6345
bench 2169281
2025-10-07 11:50:51 +02:00
Shawn Xu and Joost VandeVondele
e5c2dc5edd
remove clang-format workaround
...
closes https://github.com/official-stockfish/Stockfish/pull/6332
No functional change
2025-10-05 09:33:42 +02:00
FauziAkram and Joost 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
nicolasduhamel and Joost VandeVondele
5c93616a3f
Adjust aspiration window
...
Narrow the aspiration window after fail high.
Passed STC:
LLR: 2.98 (-2.94,2.94) <0.00,2.00>
Total: 51296 W: 13550 L: 13207 D: 24539
Ptnml(0-2): 165, 5971, 13052, 6276, 184
https://tests.stockfishchess.org/tests/view/68d99afffa806e2e8393b7ae
Passed LTC;
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 87780 W: 22795 L: 22375 D: 42610
Ptnml(0-2): 52, 9340, 24694, 9744, 60
https://tests.stockfishchess.org/tests/view/68dae0a6fa806e2e8393baad
See the comments in #6293 discussing the mechanisms leading to issue #6296
closes https://github.com/official-stockfish/Stockfish/pull/6337
Bench: 2336606
2025-10-05 09:23:02 +02:00
Shawn Xu and Joost VandeVondele
c62e71e78f
Simplify a separate term in low ply history bonus formula
...
Passed Non-regression STC:
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 211200 W: 54887 L: 54860 D: 101453
Ptnml(0-2): 719, 24894, 54296, 25023, 668
https://tests.stockfishchess.org/tests/view/68c21e7f59efc3c96b6112c8
Passed Non-regression LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 217842 W: 55587 L: 55568 D: 106687
Ptnml(0-2): 130, 23651, 61313, 23724, 103
https://tests.stockfishchess.org/tests/view/68c230ec59efc3c96b61135a
closes https://github.com/official-stockfish/Stockfish/pull/6307
Bench: 2070860
2025-09-28 21:19:22 +02:00
FauziAkram and Joost 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
Shawn Xu and Joost VandeVondele
415a1ad426
Simplify Probcut Clamp Further
...
Passed Non-regression STC:
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 157984 W: 41116 L: 41030 D: 75838
Ptnml(0-2): 568, 18570, 40601, 18714, 539
https://tests.stockfishchess.org/tests/view/68b750518f94a4e5a7fe76cd
Passed Non-regression LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 335232 W: 85443 L: 85543 D: 164246
Ptnml(0-2): 177, 36616, 94137, 36502, 184
https://tests.stockfishchess.org/tests/view/68bc767259efc3c96b61076b
closes https://github.com/official-stockfish/Stockfish/pull/6303
Bench: 2213844
2025-09-28 21:12:01 +02:00
7a36c0e95f
Remove quiet move streak
...
Passed Non-regression STC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 67712 W: 17744 L: 17555 D: 32413
Ptnml(0-2): 204, 8030, 17274, 8069, 279
https://tests.stockfishchess.org/tests/view/68b784628f94a4e5a7fe7706
Passed Non-regression LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 196050 W: 50270 L: 50228 D: 95552
Ptnml(0-2): 122, 21465, 54813, 21499, 126
https://tests.stockfishchess.org/tests/view/68ba119d8f94a4e5a7fe7941
closes https://github.com/official-stockfish/Stockfish/pull/6299
Bench: 2238789
Co-authored-by: Daniel Monroe <github.com@danielmonroe.net >
2025-09-28 21:08:58 +02:00
Michael Chaly and Joost VandeVondele
4f4f78f86e
Extend nodes pre qsearch only with deep enough tt entries
...
Modification of current pre qsearch extensions - allowing it only for deep enough tt entries.
Passed STC:
https://tests.stockfishchess.org/tests/view/68c954d302c43c969fe7eea5
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 35872 W: 9548 L: 9236 D: 17088
Ptnml(0-2): 101, 4075, 9295, 4341, 124
Passed LTC:
https://tests.stockfishchess.org/tests/view/68ca4e4f02c43c969fe7ef5f
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 107754 W: 27784 L: 27324 D: 52646
Ptnml(0-2): 47, 11528, 30300, 11922, 80
closes https://github.com/official-stockfish/Stockfish/pull/6324
bench: 2462792
2025-09-28 20:56:36 +02:00
Nonlinear2 and Joost VandeVondele
6fa42d9724
Simplify RFP return value
...
Passed non-regression STC:
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 220800 W: 57351 L: 57332 D: 106117
Ptnml(0-2): 726, 26200, 56548, 26181, 745
https://tests.stockfishchess.org/tests/view/68b1db6e6217b8721dca9c67
Passed gainer LTC:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 257820 W: 66286 L: 65523 D: 126011
Ptnml(0-2): 118, 27586, 72779, 28269, 158
https://tests.stockfishchess.org/tests/view/68c1d40859efc3c96b610e3d
closes https://github.com/official-stockfish/Stockfish/pull/6310
bench: 2364596
2025-09-28 20:53:47 +02:00
FauziAkram and Joost 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
Syine Mineta and Joost VandeVondele
a47a1c1804
Penalty to TT move history on MultiCut
...
If a reduced search fails high with the TT move excluded, we know that
there are multiple moves that can produce cutoffs. Applying a penalty
to the TT move history reduces extensions for TT moves so that it may
spend a bit more time exploring other moves.
Passed STC:
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 263680 W: 68965 L: 68313 D: 126402
Ptnml(0-2): 855, 31090, 67336, 31666, 893
https://tests.stockfishchess.org/tests/view/68c1f65a59efc3c96b6110e5
Passed LTC:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 61008 W: 15713 L: 15350 D: 29945
Ptnml(0-2): 27, 6428, 17235, 6783, 31
https://tests.stockfishchess.org/tests/view/68c1fc5359efc3c96b611141
Passed non-regression VLTC (60+0.6, Threads=8):
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 50340 W: 13003 L: 12830 D: 24507
Ptnml(0-2): 3, 4570, 15849, 4747, 1
https://tests.stockfishchess.org/tests/view/68c2056559efc3c96b6111c3
closes https://github.com/official-stockfish/Stockfish/pull/6305
Bench: 2342975
2025-09-28 20:49:24 +02:00
Syine Mineta and Joost VandeVondele
fc54d87301
Revert "Adjustment of the aspiration window after fail high/low."
...
This reverts commit bfc7000597https://github.com/official-stockfish/Stockfish/issues/6296
After this commit a bug has been reported when the position is close to
mate or being mated. Since no workarounds have been suggested yet, it
is best to revert this commit until a better solution is found.
closes https://github.com/official-stockfish/Stockfish/pull/6309
Bench: 2493363
2025-09-13 08:18:52 +02:00
Stefan Geschwentner and Joost VandeVondele
bfc7000597
Adjustment of the aspiration window after fail high/low.
...
For the new bound in the opposite direction of the fail, use a weighted average of alpha, beta and best value +- delta. In the case of a fail high, different average weights are used depending on whether or not there was a best move change during the last search.
The weights are determined from the following two consecutive LTC tunings.
First tuning: https://tests.stockfishchess.org/tests/view/68ab727975da51a345a5ac2e
Second tuning: https://tests.stockfishchess.org/tests/view/68aba3fe75da51a345a5ad52
Passed LTC:
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 39504 W: 10243 L: 9947 D: 19314
Ptnml(0-2): 25, 4182, 11041, 4480, 24
https://tests.stockfishchess.org/tests/view/68acbb6d6217b8721dca95f8
Passed VLTC:
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 91196 W: 23574 L: 23167 D: 44455
Ptnml(0-2): 13, 8943, 27276, 9356, 10
https://tests.stockfishchess.org/tests/view/68af64786217b8721dca993d
closes https://github.com/official-stockfish/Stockfish/pull/6292
Bench: 2785713
2025-09-06 07:57:57 +02:00
Shawn Xu and Joost VandeVondele
adfddd2c98
Add scaling note to STC/LTC tunes
...
It has been repeatedly shown that such tunes are suspectible to become
anti-scaling. Below are some recent examples:
https://github.com/official-stockfish/Stockfish/commit/2e91a8635468e40c89a2303ce50384864d088611
https://github.com/official-stockfish/Stockfish/commit/d11f49b790429c236a1a4169f0d8052635fc03dc
Passed STC:
LLR: 2.95 (-2.94,2.94) <0.00,2.00>
Total: 32448 W: 8651 L: 8342 D: 15455
Ptnml(0-2): 81, 3695, 8408, 3914, 126
https://tests.stockfishchess.org/tests/view/6899489b0049e8ccef9d64ad
Passed LTC:
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 73854 W: 19042 L: 18649 D: 36163
Ptnml(0-2): 37, 7908, 20659, 8271, 52
https://tests.stockfishchess.org/tests/view/689abbe7fd8719b088c8d514
Revert VVLTC with STC bound:
LLR: 2.95 (-2.94,2.94) <0.00,2.00>
Total: 53802 W: 14030 L: 13740 D: 26032
Ptnml(0-2): 5, 4924, 16754, 5212, 6
https://tests.stockfishchess.org/tests/view/68a9a9f575da51a345a5a675
Revert VVLTC with LTC bound:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 53658 W: 14022 L: 13699 D: 25937
Ptnml(0-2): 3, 4894, 16712, 5217, 3
https://tests.stockfishchess.org/tests/view/68a8d2b2b6fb3300203bca77
https://tests.stockfishchess.org/tests/view/688cf38bf17748b4d23c8057
https://tests.stockfishchess.org/tests/view/6890bc7792fcad741b804a19
Passed LTC:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 74928 W: 19466 L: 19071 D: 36391
Ptnml(0-2): 37, 8048, 20901, 8439, 39
Failed Non-regression VLTC:
LLR: -2.94 (-2.94,2.94) <-1.75,0.25>
Total: 57704 W: 14643 L: 14928 D: 28133
Ptnml(0-2): 5, 5925, 17280, 5634, 8
https://tests.stockfishchess.org/tests/view/6890bc7792fcad741b804a19
(Note that an STC-tuned version passed non-regression, but was shortly
simplified)
https://github.com/official-stockfish/Stockfish/pull/6040
Passed STC:
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 27776 W: 7352 L: 7054 D: 13370
Ptnml(0-2): 68, 3126, 7221, 3386, 87
https://tests.stockfishchess.org/tests/view/680ec0f83629b02d74b1605b
Passed LTC:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 161304 W: 41432 L: 40864 D: 79008
Ptnml(0-2): 61, 17305, 45357, 17863, 66
https://tests.stockfishchess.org/tests/view/680ec7f93629b02d74b16084
Failed Non-regression VVLTC:
LLR: -2.94 (-2.94,2.94) <-1.75,0.25>
Total: 313466 W: 80573 L: 81089 D: 151804
Ptnml(0-2): 38, 29689, 97782, 29199, 25
https://tests.stockfishchess.org/tests/view/6810d0533629b02d74b16756
https://github.com/official-stockfish/Stockfish/pull/5907
https://github.com/official-stockfish/Stockfish/pull/5887
Passed LTC with STC bounds:
https://tests.stockfishchess.org/tests/view/67b115dd6c6b9e172ad1592f
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 75756 W: 19393 L: 19044 D: 37319
Ptnml(0-2): 60, 8251, 20913, 8588, 66
Passed LTC with LTC bounds:
https://tests.stockfishchess.org/tests/view/67af5f5d6c6b9e172ad15765
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 108126 W: 27880 L: 27412 D: 52834
Ptnml(0-2): 85, 11786, 29866, 12228, 98
Revert VVLTC w/ STC bounds:
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 56342 W: 14536 L: 14246 D: 27560
Ptnml(0-2): 7, 5061, 17741, 5359, 3
https://tests.stockfishchess.org/tests/view/67be4f8ad8d5c2c657c52d10
Revert VVLTC w/ LTC bounds:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 66562 W: 17364 L: 17016 D: 32182
Ptnml(0-2): 3, 6145, 20637, 6493, 3
https://tests.stockfishchess.org/tests/view/67bcd25ff6b602bd7222ea40
closes https://github.com/official-stockfish/Stockfish/pull/6284
no functional change
2025-09-02 20:42:03 +02:00
Shawn Xu and Joost VandeVondele
f2da0ccf3f
Simplify SMP Reduction
...
Passed Non-regression SMP STC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 232784 W: 59845 L: 59841 D: 113098
Ptnml(0-2): 289, 26459, 62934, 26379, 331
https://tests.stockfishchess.org/tests/view/68ab96bf75da51a345a5acd6
Passed Non-regression SMP LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 374270 W: 95978 L: 96113 D: 182179
Ptnml(0-2): 118, 38575, 109888, 38432, 122
https://tests.stockfishchess.org/tests/view/68abcf1c75da51a345a5adb6
closes https://github.com/official-stockfish/Stockfish/pull/6285
Bench: 2667107
2025-09-02 20:41:08 +02:00
Shawn Xu and Joost VandeVondele
75ac6c7a06
simplify stalemate further
...
Non-regression STC:
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 155200 W: 40650 L: 40562 D: 73988
Ptnml(0-2): 533, 17588, 41258, 17700, 521
https://tests.stockfishchess.org/tests/view/68abe11375da51a345a5adec
Non-regression LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 82824 W: 21442 L: 21287 D: 40095
Ptnml(0-2): 51, 8738, 23675, 8901, 47
https://tests.stockfishchess.org/tests/view/68b205606217b8721dca9c8e
10k Stalemate:
Elo: 1.46 ± 1.2 (95%) LOS: 99.0%
Total: 10000 W: 4640 L: 4598 D: 762
Ptnml(0-2): 0, 140, 4678, 182, 0
https://tests.stockfishchess.org/tests/view/68b2059b6217b8721dca9c90
closes https://github.com/official-stockfish/Stockfish/pull/6283
Bench: 2431727
2025-09-02 20:39:02 +02:00
Daniel Monroe and Joost VandeVondele
da63060ea3
Simplify sign term in quiet histories
...
Simplify sign term in quiet histories
Passed simplification STC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 497824 W: 129130 L: 129418 D: 239276
Ptnml(0-2): 1546, 59040, 128008, 58792, 1526
https://tests.stockfishchess.org/tests/view/68a2a9c1b6fb3300203bc3ed
Passed simplification LTC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 70830 W: 18185 L: 18016 D: 34629
Ptnml(0-2): 36, 7658, 19861, 7821, 39
https://tests.stockfishchess.org/tests/view/68af36c96217b8721dca98d9
closes https://github.com/official-stockfish/Stockfish/pull/6282
Bench: 2393762
2025-09-02 20:37:04 +02:00
Joost VandeVondele and xu-shawn
3833583862
limit dynamic reduction.
...
fixes https://github.com/official-stockfish/Stockfish/issues/6280
prevents probcut from extending depth as analyzed here:
https://github.com/official-stockfish/Stockfish/pull/6254#issuecomment-3239144280
passed STC:
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 86688 W: 22591 L: 22426 D: 41671
Ptnml(0-2): 305, 10125, 22311, 10306, 297
https://tests.stockfishchess.org/tests/view/68b418ab467ff96994ae4cd5
passed LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 82914 W: 21287 L: 21130 D: 40497
Ptnml(0-2): 39, 8959, 23305, 9114, 40
https://tests.stockfishchess.org/tests/view/68b47ffa78ed7a752a9e8f36
closes https://github.com/official-stockfish/Stockfish/pull/6286
Bench: 2787731
Co-Authored-By: xu-shawn <50402888+xu-shawn@users.noreply.github.com >
2025-09-02 20:34:47 +02:00
Shawn Xu and Joost VandeVondele
3f18352396
Further Simplify Stalemate Detection
...
Passed Non-regression STC:
LLR: 2.98 (-2.94,2.94) <-1.75,0.25>
Total: 191520 W: 49633 L: 49582 D: 92305
Ptnml(0-2): 557, 20676, 53260, 20693, 574
https://tests.stockfishchess.org/tests/view/68ab570075da51a345a5abe1
Passed Non-regression LTC:
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 212934 W: 54643 L: 54618 D: 103673
Ptnml(0-2): 117, 22417, 61364, 22462, 107
https://tests.stockfishchess.org/tests/view/68ab84e975da51a345a5ac6b
10k Stalemate:
Elo: 0.35 ± 1.2 (95%) LOS: 71.6%
Total: 10000 W: 4602 L: 4592 D: 806
Ptnml(0-2): 0, 148, 4694, 158, 0
nElo: 1.99 ± 6.8 (95%) PairsRatio: 1.07
https://tests.stockfishchess.org/tests/view/68abeb8175da51a345a5af82
closes https://github.com/official-stockfish/Stockfish/pull/6268
Bench: 2420973
2025-08-30 15:12:06 +02:00
7d213afd37
Non-functional simplifications
...
closes https://github.com/official-stockfish/Stockfish/pull/6267
No functional change
Co-authored-by: Daniel Monroe <github.com@danielmonroe.net >
2025-08-30 15:09:47 +02:00
Shawn Xu and Joost VandeVondele
a289ee389a
Simplify Capture Futility Pruning
...
Passed Non-regression STC:
LLR: 2.97 (-2.94,2.94) <-1.75,0.25>
Total: 187904 W: 48639 L: 48583 D: 90682
Ptnml(0-2): 560, 22150, 48502, 22154, 586
https://tests.stockfishchess.org/tests/view/68aad56075da51a345a5a9e3
Passed Non-regression LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 94302 W: 24246 L: 24101 D: 45955
Ptnml(0-2): 44, 10274, 26371, 10417, 45
https://tests.stockfishchess.org/tests/view/68ab541975da51a345a5aacf
closes https://github.com/official-stockfish/Stockfish/pull/6266
Bench: 2376717
2025-08-30 15:09:00 +02:00
Nonlinear2 and Joost VandeVondele
75f07da912
Avoid high rule50 count zeroing cutoffs
...
If the depth is low enough, don't TT cut if the rule50 count is high and the TT move is zeroing.
Passed STC:
https://tests.stockfishchess.org/tests/view/68a8fdd8b6fb3300203bcb92
LLR: 3.05 (-2.94,2.94) <0.00,2.00>
Total: 110304 W: 28805 L: 28402 D: 53097
Ptnml(0-2): 275, 11174, 31875, 11529, 299
Passed LTC:
https://tests.stockfishchess.org/tests/view/68aa200f75da51a345a5a809
LLR: 3.00 (-2.94,2.94) <0.50,2.50>
Total: 187956 W: 48489 L: 47928 D: 91539
Ptnml(0-2): 59, 16118, 61075, 16655, 71
closes https://github.com/official-stockfish/Stockfish/pull/6271
bench: 2641840
2025-08-30 15:05:11 +02:00
Shawn Xu and Joost VandeVondele
678d503d8f
Simplify LMR Extensions
...
Passed Non-regression STC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 236896 W: 61683 L: 61683 D: 113530
Ptnml(0-2): 730, 28057, 60901, 28003, 757
https://tests.stockfishchess.org/tests/view/68a9c20475da51a345a5a6a0
Passed Non-regression LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 73644 W: 18936 L: 18770 D: 35938
Ptnml(0-2): 33, 7951, 20685, 8123, 30
https://tests.stockfishchess.org/tests/view/68aa95c575da51a345a5a88a
closes https://github.com/official-stockfish/Stockfish/pull/6265
Bench: 2693376
2025-08-24 20:10:43 +02:00
Stefan Geschwentner and Joost VandeVondele
39c077f15a
Less reduction for later threads.
...
Give "(thread id mod 8) * 64" less reductions (up to nearly a half ply).
Passed SMP STC:
LLR: 2.95 (-2.94,2.94) <0.00,2.00>
Total: 413176 W: 106496 L: 105666 D: 201014
Ptnml(0-2): 504, 46732, 111266, 47602, 484
https://tests.stockfishchess.org/tests/view/68a24aeeb6fb3300203bbdc4
Passed SMP LTC:
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 60420 W: 15622 L: 15268 D: 29530
Ptnml(0-2): 11, 6106, 17632, 6440, 21
https://tests.stockfishchess.org/tests/view/68a2c2ffb6fb3300203bc516
closes https://github.com/official-stockfish/Stockfish/pull/6249
No functional change
2025-08-24 20:07:50 +02:00
FauziAkram and Joost 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
Shawn Xu and Joost VandeVondele
e2fdf6f005
Simplify separate malus formulas
...
Passed Non-regression STC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 16352 W: 4336 L: 4090 D: 7926
Ptnml(0-2): 54, 1832, 4157, 2080, 53
https://tests.stockfishchess.org/tests/view/68a808f0b6fb3300203bca08
Passed Non-regression LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 94014 W: 24129 L: 23986 D: 45899
Ptnml(0-2): 47, 9917, 26934, 10064, 45
https://tests.stockfishchess.org/tests/view/68a8f45cb6fb3300203bcb5e
closes https://github.com/official-stockfish/Stockfish/pull/6256
Bench: 2483704
2025-08-24 19:55:35 +02:00
Shawn Xu and Joost VandeVondele
901ad7e7ee
Simplify quiet move streak
...
Passed Non-regression STC:
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 46272 W: 12076 L: 11866 D: 22330
Ptnml(0-2): 140, 5407, 11860, 5561, 168
https://tests.stockfishchess.org/tests/view/68a9c26575da51a345a5a6a2
Passed Non-regression LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 140442 W: 35984 L: 35886 D: 68572
Ptnml(0-2): 72, 15333, 39305, 15447, 64
https://tests.stockfishchess.org/tests/view/68aa245e75da51a345a5a80d
closes https://github.com/official-stockfish/Stockfish/pull/6258
Bench: 2931171
2025-08-24 19:52:42 +02:00
Shawn Xu and Joost VandeVondele
85f87649bf
Simplify stalemate detection
...
Passed Non-regression STC:
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 107392 W: 27959 L: 27818 D: 51615
Ptnml(0-2): 317, 12094, 28735, 12231, 319
https://tests.stockfishchess.org/tests/view/68a65d8ab6fb3300203bc825
Passed Non-regression LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 94014 W: 24129 L: 23986 D: 45899
Ptnml(0-2): 47, 9917, 26934, 10064, 45
https://tests.stockfishchess.org/tests/view/68a8f45cb6fb3300203bcb5e
Passed Stalemate 10k:
Elo: 2.22 ± 1.3 (95%) LOS: 100.0%
Total: 10000 W: 4626 L: 4562 D: 812
Ptnml(0-2): 1, 137, 4659, 203, 0
nElo: 12.00 ± 6.8 (95%) PairsRatio: 1.47
https://tests.stockfishchess.org/tests/view/68a65d8ab6fb3300203bc825
Supersedes #6114
Closes #6232
closes https://github.com/official-stockfish/Stockfish/pull/6255
Bench: 2473929
2025-08-24 19:50:51 +02:00
Daniel Monroe and Joost VandeVondele
7fa7a36dc6
Remove upper bound in see margin
...
Passed simplification STC
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 99840 W: 25965 L: 25815 D: 48060
Ptnml(0-2): 326, 11708, 25688, 11886, 312
https://tests.stockfishchess.org/tests/view/68a24504b6fb3300203bbdae
Passed simplification LTC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 248388 W: 63544 L: 63556 D: 121288
Ptnml(0-2): 125, 27132, 69709, 27086, 142
https://tests.stockfishchess.org/tests/view/68a24f3bb6fb3300203bbdee
closes https://github.com/official-stockfish/Stockfish/pull/6250
Bench: 2432765
2025-08-24 19:47:20 +02:00
Daniel Samek and Joost VandeVondele
2659351ce7
Remove depth reduction in the full-depth search
...
Passed simplification STC:
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 217184 W: 56218 L: 56195 D: 104771
Ptnml(0-2): 627, 25673, 55985, 25664, 643
https://tests.stockfishchess.org/tests/view/68a21e0eb6fb3300203bbcf3
Passed simplification LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 30474 W: 7923 L: 7713 D: 14838
Ptnml(0-2): 20, 3205, 8569, 3431, 12
https://tests.stockfishchess.org/tests/view/68a2adacb6fb3300203bc3f9
closes https://github.com/official-stockfish/Stockfish/pull/6246
bench 2626263
2025-08-24 19:45:23 +02:00
Daniel Monroe and Joost VandeVondele
57d76bd459
Simplify depth condition in prior reduction
...
Passed simplification STC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 172864 W: 45085 L: 45015 D: 82764
Ptnml(0-2): 516, 20456, 44405, 20552, 503
https://tests.stockfishchess.org/tests/view/68a24791b6fb3300203bbdb6
Passed simplification LTC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 84738 W: 21733 L: 21578 D: 41427
Ptnml(0-2): 49, 9169, 23780, 9320, 51
https://tests.stockfishchess.org/tests/view/68a2665ab6fb3300203bc269
closes https://github.com/official-stockfish/Stockfish/pull/6244
Bench: 2131292
2025-08-24 19:43:48 +02:00
FauziAkram and Joost 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
Stefan Geschwentner and Joost VandeVondele
d11f49b790
Remove log depth reduction terms.
...
Motivated by the elo loss of last VVLTC regression test i remove the new log
depth reductions (tuned at STC) to regain strength at VVLTC. The constant terms
are adjusted based on the old values and the changes from the last added VVLTC
tuning.
Passed VVLTC with STC bound:
LLR: 2.95 (-2.94,2.94) <0.00,2.00>
Total: 53802 W: 14030 L: 13740 D: 26032
Ptnml(0-2): 5, 4924, 16754, 5212, 6
https://tests.stockfishchess.org/tests/view/68a9a9f575da51a345a5a675
Passed VVLTC with LTC bound:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 53658 W: 14022 L: 13699 D: 25937
Ptnml(0-2): 3, 4894, 16712, 5217, 3
https://tests.stockfishchess.org/tests/view/68a8d2b2b6fb3300203bca77
closes https://github.com/official-stockfish/Stockfish/pull/6257
Bench: 2566780
2025-08-24 19:30:31 +02:00
FauziAkram and Joost 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
Stefan Geschwentner and Joost VandeVondele
8ecfc3c89d
Bigger thread dependent initial window.
...
Increase the initial delta of the aspiration window by "thread id mod 8".
Passed SMP STC:
LLR: 2.96 (-2.94,2.94) <0.00,2.00>
Total: 106176 W: 27470 L: 27069 D: 51637
Ptnml(0-2): 121, 12032, 28386, 12423, 126
https://tests.stockfishchess.org/tests/view/68a178fab6fb3300203bbaec
Passed SMP LTC:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 133076 W: 34272 L: 33772 D: 65032
Ptnml(0-2): 38, 13709, 38537, 14223, 31
https://tests.stockfishchess.org/tests/view/68a1b5d2b6fb3300203bbb71
closes https://github.com/official-stockfish/Stockfish/pull/6239
No functional change
2025-08-17 22:39:49 +02:00
