FauziAkram
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
Daniel Monroe
76c319f438
Simplify ttcut depth condition
...
Simplify ttcut depth condition in a recent tweak of Nonlinear (PR #5876 )
Passed simplification STC
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 235328 W: 61646 L: 61644 D: 112038
Ptnml(0-2): 1039, 27947, 59676, 27977, 1025
https://tests.stockfishchess.org/tests/view/67abc7fba04df5eb8dbeb442
Passed simplification LTC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 63744 W: 16306 L: 16128 D: 31310
Ptnml(0-2): 58, 6918, 17748, 7084, 64
https://tests.stockfishchess.org/tests/view/67abd776a04df5eb8dbeb9c1
closes https://github.com/official-stockfish/Stockfish/pull/5877
Bench: 2667779
2025-02-24 19:03:19 +01:00
Carlos Esparza
e9997afb1c
Replace hint_common_parent_position() by backwards accumulator updates
...
Only calls to `evaluate()` now trigger NNUE accumulator updates. To make
sure that we are likely to find parent positions from which to update
the accumulators we perform a backwards NNUE update whenever we compute
the accumulator from scratch for some position.
passed STC
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 39680 W: 10474 L: 10164 D: 19042
Ptnml(0-2): 171, 4068, 11042, 4398, 161
https://tests.stockfishchess.org/tests/view/67a27f26eb183d11c65945be
passed LTC
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 337308 W: 86408 L: 85550 D: 165350
Ptnml(0-2): 276, 30551, 106126, 31441, 260
https://tests.stockfishchess.org/tests/view/67a287efeb183d11c65945ee
then simplified:
STC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 28608 W: 7641 L: 7413 D: 13554
Ptnml(0-2): 132, 3036, 7744, 3256, 136
https://tests.stockfishchess.org/tests/view/67a4703719f522d3866d3345
LTC
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 200226 W: 51026 L: 50990 D: 98210
Ptnml(0-2): 170, 18468, 62799, 18508, 168
https://tests.stockfishchess.org/tests/view/67a4f255229c1a170cc08964
The version in this PR is a bit different from the simplified version,
but it's compile-time changes only.
closes https://github.com/official-stockfish/Stockfish/pull/5870
No functional change
2025-02-24 19:01:23 +01:00
FauziAkram
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
Daniel Monroe
d54240c50a
Decrease lmr depth if static eval decreases a lot
...
This tweak originally had some more conditions which have been simplified away.
Passed STC
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 60064 W: 15797 L: 15439 D: 28828
Ptnml(0-2): 236, 7080, 15106, 7310, 300
https://tests.stockfishchess.org/tests/view/67a2af9cfedef70e42ac3325
Passed LTC
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 76794 W: 19740 L: 19337 D: 37717
Ptnml(0-2): 61, 8327, 21236, 8694, 79
https://tests.stockfishchess.org/tests/view/67a2c904fedef70e42ac374d
Passed Non-Regression VVLTC scaling check
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 29046 W: 7581 L: 7389 D: 14076
Ptnml(0-2): 2, 2557, 9213, 2749, 2
https://tests.stockfishchess.org/tests/view/67a54b591c4a3ea87241cb83
Passed simplification STC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 212448 W: 55244 L: 55217 D: 101987
Ptnml(0-2): 932, 25283, 53707, 25430, 872
https://tests.stockfishchess.org/tests/view/67aaacb02554387b116f698f
Passed simplification LTC
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 185736 W: 47270 L: 47217 D: 91249
Ptnml(0-2): 141, 20568, 51394, 20627, 138
https://tests.stockfishchess.org/tests/view/67ab8efa133d55b1d3bc1397
closes https://github.com/official-stockfish/Stockfish/pull/5878
Bench: 2512420
2025-02-13 20:17:26 +01:00
Nonlinear2
a4edacb87a
Tweak the cutnode depth condition for TT cutoffs
...
Passed STC:
https://tests.stockfishchess.org/tests/view/67ab396ab5c93ee812d851f3
LLR: 2.96 (-2.94,2.94) <0.00,2.00>
Total: 83648 W: 21964 L: 21571 D: 40113
Ptnml(0-2): 339, 9779, 21217, 10128, 361
Passed LTC:
https://tests.stockfishchess.org/tests/view/67ab9647133d55b1d3bc171e
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 68160 W: 17551 L: 17166 D: 33443
Ptnml(0-2): 62, 7353, 18870, 7728, 67
closes https://github.com/official-stockfish/Stockfish/pull/5876
Bench: 3087275
2025-02-13 19:52:06 +01:00
Michael Chaly
9cc15b3049
Do more reductions for cut nodes without a tt move
...
Logic is somewhat similar to IIR but in LMR.
Usually things like reducing more in IIR scale badly but this patch does
this in LMR where reducing more for cutNodes is in general good, so I
believe there is no non-linear scaling.
Passed STC:
https://tests.stockfishchess.org/tests/view/67abc9aaa04df5eb8dbeb452
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 42304 W: 11223 L: 10892 D: 20189
Ptnml(0-2): 184, 4904, 10669, 5187, 208
Passed LTC:
https://tests.stockfishchess.org/tests/view/67abcd7ba04df5eb8dbeb96c
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 32334 W: 8386 L: 8074 D: 15874
Ptnml(0-2): 26, 3446, 8916, 3748, 31
closes https://github.com/official-stockfish/Stockfish/pull/5875
Bench: 2612849
2025-02-13 19:49:54 +01:00
Stefan Geschwentner
7258567804
Refactor reduction rules
...
Refactor reduction rules so that all ttPv/Pv related stuff is in one
rule and the scaling becomes more clear. No functional change
closes https://github.com/official-stockfish/Stockfish/pull/5871
No functional change
2025-02-13 19:46:53 +01:00
Daniel Monroe
3a0418c0d0
Simplify opponent worsening
...
Passed simplification STC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 57120 W: 14712 L: 14526 D: 27882
Ptnml(0-2): 53, 6241, 15796, 6407, 63
https://tests.stockfishchess.org/tests/view/67a26153eb183d11c659454d
Passed simplification LTC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 313452 W: 79893 L: 79973 D: 153586
Ptnml(0-2): 279, 35053, 86156, 34945, 293
https://tests.stockfishchess.org/tests/view/67a29fe0fedef70e42ac32ae
closes https://github.com/official-stockfish/Stockfish/pull/5867
Bench: 2582245
2025-02-13 19:45:55 +01:00
Carlos Esparza
e089f723d8
Remove two xors by setting the hash keys for unreachable squares to zero
...
performance before:
3.6714 +- 0.20% Gcycles
3.6620 +- 0.12% Gcycles
3.6704 +- 0.26% Gcycles
3.6602 +- 0.27% Gcycles
3.6799 +- 0.37% Gcycles
after:
3.6540 +- 0.30% Gcycles
3.6388 +- 0.25% Gcycles
3.6557 +- 0.17% Gcycles
3.6449 +- 0.15% Gcycles
3.6460 +- 0.26% Gcycles
(every line is a different `profile-build` and shows the number of
cycles needed for `./stockfish bench`, measured with `perf stat -r 10`)
closes https://github.com/official-stockfish/Stockfish/pull/5754
No functional change
2025-02-13 19:44:53 +01:00
Shawn Xu
d66e603070
Increase PCM bonus when cutOffCnt is low
...
Passed STC:
LLR: 2.95 (-2.94,2.94) <0.00,2.00>
Total: 36832 W: 9763 L: 9438 D: 17631
Ptnml(0-2): 159, 4267, 9254, 4562, 174
https://tests.stockfishchess.org/tests/view/67a29dbafedef70e42ac329a
Passed LTC:
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 19728 W: 5124 L: 4839 D: 9765
Ptnml(0-2): 18, 2029, 5485, 2314, 18
https://tests.stockfishchess.org/tests/view/67a2a1abfedef70e42ac32b7
closes https://github.com/official-stockfish/Stockfish/pull/5865
Bench: 3197798
2025-02-05 19:00:25 +01:00
Daniel Monroe
3dfbc5de25
Remove non-pawn material check in qsearch pruning
...
Passed simplification STC
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 47712 W: 12621 L: 12409 D: 22682
Ptnml(0-2): 224, 5349, 12480, 5597, 206
https://tests.stockfishchess.org/tests/view/67a1b4fb612069de394afc37
Passed rebased simplification LTC
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 188274 W: 47727 L: 47677 D: 92870
Ptnml(0-2): 171, 20429, 52867, 20519, 151
https://tests.stockfishchess.org/tests/view/67a2a761fedef70e42ac3300
closes https://github.com/official-stockfish/Stockfish/pull/5866
bench 2654242
2025-02-05 18:56:12 +01:00
Disservin
4c6d2bf921
Show stdout/stderr in CI/CD tests
...
makes it easier to fix based on warnings shown with e.g. valgrind
closes https://github.com/official-stockfish/Stockfish/pull/5862
No functional change
2025-02-05 18:52:28 +01:00
Disservin
2a5b41fd12
Fixes a wrongly combined merge conflict from the previous merge wave.
...
Passed STC:
https://tests.stockfishchess.org/tests/view/67a288aaeb183d11c65945f1
LLR: 2.99 (-2.94,2.94) <0.00,2.00>
Total: 51424 W: 13588 L: 13237 D: 24599
Ptnml(0-2): 223, 6039, 12860, 6344, 246
Passed LTC:
https://tests.stockfishchess.org/tests/view/67a28c0aeb183d11c6594609
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 54144 W: 13900 L: 13543 D: 26701
Ptnml(0-2): 42, 5881, 14870, 6236, 43
closes https://github.com/official-stockfish/Stockfish/pull/5863
Bench: 2345723
2025-02-04 23:08:43 +01:00
Michael Chaly
e852d9880a
Reduce less for positions without tt move
...
Continuation of work on scaling.
In line with previous scaling patches this one massively reduces
reduction for moves that don't go thru lmr for position without a tt
move.
Passed VVLTC with STC bounds:
https://tests.stockfishchess.org/tests/view/679fd2450774dfd78deb12b2
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 74718 W: 19354 L: 19042 D: 36322
Ptnml(0-2): 5, 6724, 23595, 7024, 11
Passed VVLTC with LTC bounds:
https://tests.stockfishchess.org/tests/view/67a009930774dfd78deb2346
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 82638 W: 21587 L: 21212 D: 39839
Ptnml(0-2): 15, 7476, 25953, 7869, 6
closes https://github.com/official-stockfish/Stockfish/pull/5860
Bench: 2887850
2025-02-04 21:37:11 +01:00
FauziAkram
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
Viren6
ec7f1d6229
Increment cutoffCnt less often after fail high
...
Only increment when extension is less than 2 or it's a PvNode.
Tested vs #5851 .
Failed STC:
LLR: -2.97 (-2.94,2.94) <0.00,2.00>
Total: 360064 W: 94546 L: 94271 D: 171247
Ptnml(0-2): 1835, 42826, 90314, 43343, 1714
https://tests.stockfishchess.org/tests/view/679f79cc0774dfd78deb1112
Passed LTC:
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 443076 W: 113942 L: 113081 D: 216053
Ptnml(0-2): 480, 49076, 121579, 49909, 494
https://tests.stockfishchess.org/tests/view/679fa21b0774dfd78deb1178
Passed VLTC:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 187184 W: 48098 L: 47495 D: 91591
Ptnml(0-2): 59, 19036, 54792, 19653, 52
https://tests.stockfishchess.org/tests/view/679fb6000774dfd78deb11e8
closes https://github.com/official-stockfish/Stockfish/pull/5855
Bench: 3018089
2025-02-04 21:30:54 +01:00
Michael Chaly
3b8bfeb38a
Do less aggressive pruning for higher movecounts
...
Move part of heuristic that makes reduction less before pruning stage.
Passed STC:
https://tests.stockfishchess.org/tests/view/679fdf1b0774dfd78deb13b3
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 47136 W: 12484 L: 12146 D: 22506
Ptnml(0-2): 211, 5472, 11866, 5806, 213
Passed LTC:
https://tests.stockfishchess.org/tests/view/679fe6790774dfd78deb1753
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 100536 W: 25837 L: 25383 D: 49316
Ptnml(0-2): 103, 10990, 27622, 11456, 97
closes https://github.com/official-stockfish/Stockfish/pull/5853
Bench: 3265587
2025-02-04 21:28:49 +01:00
Kenneth Lee
09623abbe8
Simplify cutoffCnt further
...
Based off [Simplify cutoffCnt](69be04d38ea77a895c3bhttps://tests.stockfishchess.org/tests/view/679edb7c0774dfd78deb0eed
Passed LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 267198 W: 68148 L: 68179 D: 130871
Ptnml(0-2): 232, 30051, 73055, 30038, 223
https://tests.stockfishchess.org/tests/view/679ef2c70774dfd78deb0f43
closes https://github.com/official-stockfish/Stockfish/pull/5851
Bench: 3119355
2025-02-04 21:26:04 +01:00
Nonlinear2
9ed1725e78
Simplify bonusScale formula
...
Passed STC:
https://tests.stockfishchess.org/tests/view/679ea7bc0774dfd78deb0d68
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 47680 W: 12575 L: 12364 D: 22741
Ptnml(0-2): 179, 5589, 12139, 5708, 225
Passed LTC:
https://tests.stockfishchess.org/tests/view/679eb7760774dfd78deb0dbb
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 314220 W: 80110 L: 80189 D: 153921
Ptnml(0-2): 265, 35121, 86420, 35036, 268
closes https://github.com/official-stockfish/Stockfish/pull/5849
Bench: 3161782
2025-02-04 21:24:06 +01:00
Nonlinear2
fccc6f624e
Reduce full depth search twice
...
Passed STC:
https://tests.stockfishchess.org/tests/view/679f429e0774dfd78deb10a5
LLR: 2.95 (-2.94,2.94) <0.00,2.00>
Total: 71584 W: 18905 L: 18529 D: 34150
Ptnml(0-2): 302, 8372, 18081, 8722, 315
Passed LTC:
https://tests.stockfishchess.org/tests/view/679f72a00774dfd78deb1102
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 353952 W: 91007 L: 90024 D: 172921
Ptnml(0-2): 375, 39163, 96921, 40138, 379
closes https://github.com/official-stockfish/Stockfish/pull/5848
Bench: 3642363
2025-02-04 21:22:08 +01:00
Disservin
c12dbdedd9
Disallow same option being added twice
...
Now exits during startup.
```
./stockfish
Stockfish dev-20250202-243c7c6a by the Stockfish developers (see AUTHORS file)
x1,5,0,10,0.5,0.0020
Option: "x1" was already added!
```
i.e. prevents and helps debug this case
```cpp
int x1 = 5;
TUNE(x1);
TUNE(x1);
```
closes https://github.com/official-stockfish/Stockfish/pull/5847
No functional change
2025-02-04 21:18:01 +01:00
Shawn Xu
8c73472ac8
Simplify depth increase condition further
...
Passed Non-regression STC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 51232 W: 13560 L: 13351 D: 24321
Ptnml(0-2): 183, 6075, 12920, 6226, 212
https://tests.stockfishchess.org/tests/view/679d7b2b0774dfd78deb043f
Passed Non-regression LTC (v. #5827 ):
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 172398 W: 44108 L: 44042 D: 84248
Ptnml(0-2): 122, 19207, 47489, 19245, 136
https://tests.stockfishchess.org/tests/view/679d7fb10774dfd78deb05d2
Passed Non-regression VLTC (v. #5827 ):
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 388540 W: 99314 L: 99464 D: 189762
Ptnml(0-2): 89, 40454, 113350, 40272, 105
https://tests.stockfishchess.org/tests/view/679da3be0774dfd78deb0ad4
closes https://github.com/official-stockfish/Stockfish/pull/5846
Bench: 2688175
2025-02-04 21:11:37 +01:00
Guenther Demetz
2a1ab11ab0
Micro-optimization for SEE: remove a superfluous condition
...
This condition can never be true, it's superfluous.
It never triggers even with a bench 16 1 20 run.
To met the condition it would imply that the previous recapture was done
by a higher rated piece than a Queen.
This is only the case when the King recaptures and that's already
handled in line 1161: (return (attackers & ~pieces(stm)) ? res ^ 1).
closes https://github.com/official-stockfish/Stockfish/pull/5839
No functional change
2025-02-04 21:11:05 +01:00
Robert Nurnberg @ elitebook
d46c0b6f49
Add cursed win checks to CI matetrack tests
...
This PR adds a run for the `matecheck.py` script from the matetrack repo
with the option `--syzygy50MoveRule false`.
The new tests guard against a re-introduction of the bugs recently fixed
by https://github.com/official-stockfish/Stockfish/pull/5814 .
closes https://github.com/official-stockfish/Stockfish/pull/5829
No functional change
2025-02-02 13:54:04 +01:00
Kenneth Lee
9f0844c101
Simplify extensions depth increase condition
...
Passed STC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 42784 W: 11198 L: 10979 D: 20607
Ptnml(0-2): 166, 5024, 10822, 5185, 195
https://tests.stockfishchess.org/tests/view/6795b6f8f6281b7d7b1869d6
Failed LTC:
LLR: -2.95 (-2.94,2.94) <-1.75,0.25>
Total: 283614 W: 72046 L: 72587 D: 138981
Ptnml(0-2): 241, 32097, 77647, 31606, 216
https://tests.stockfishchess.org/tests/view/6795cbb6f6281b7d7b186a07
Passed VLTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 59678 W: 15387 L: 15211 D: 29080
Ptnml(0-2): 23, 6169, 17273, 6357, 17
https://tests.stockfishchess.org/tests/view/6795c6dbf6281b7d7b1869f9
closes https://github.com/official-stockfish/Stockfish/pull/5827
Bench: 3088494
2025-02-02 13:52:16 +01:00
Disservin
65a9a391e9
Silence clang-format issue
...
No functional change
2025-02-02 13:49:54 +01:00
Michael Chaly
dabffbceff
Make pruning at ttpv nodes more aggressive
...
Continuation of work done by @FauziAkram and @Viren6 They had a series
of patches that decrease pruning for ttPv nodes - and it passed as a
gainer at lower time controls while revert passed as a gainer at higher
time controls.
So it's a logical continuation of this work that increases pruning for
ttPv nodes in hopes of scaling to longer TCs.
Fixed games STC:
https://tests.stockfishchess.org/tests/view/679ee3910774dfd78deb0efd
Elo: -4.98 ± 2.1 (95%) LOS: 0.0%
Total: 28584 W: 7229 L: 7639 D: 13716
Ptnml(0-2): 143, 3579, 7219, 3247, 104
nElo: -9.54 ± 4.0 (95%) PairsRatio: 0.90
Passed VVLTC with STC bounds:
https://tests.stockfishchess.org/tests/view/679d21f70774dfd78deaf553
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 323282 W: 83729 L: 83105 D: 156448
Ptnml(0-2): 37, 29842, 101269, 30446, 47
Passed VVLTC with LTC bounds:
https://tests.stockfishchess.org/tests/view/679e7a970774dfd78deb0cd3
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 113712 W: 29485 L: 29051 D: 55176
Ptnml(0-2): 13, 10376, 35640, 10818, 9
closes https://github.com/official-stockfish/Stockfish/pull/5844
Bench: 2964045
2025-02-02 13:47:52 +01:00
Shawn Xu
344e89275a
Simplify Away Quadruple Extensions
...
Passed Non-regression LTC:
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 95856 W: 24551 L: 24404 D: 46901
Ptnml(0-2): 85, 10621, 26364, 10778, 80
https://tests.stockfishchess.org/tests/view/679a9aedae346be6da0eebd6
Passed Non-regression VLTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 157536 W: 40000 L: 39921 D: 77615
Ptnml(0-2): 43, 16416, 45775, 16487, 47
https://tests.stockfishchess.org/tests/view/679aed8f51037ccaf3e30fbf
Passed Non-regression VVLTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 51598 W: 13345 L: 13172 D: 25081
Ptnml(0-2): 0, 4735, 16162, 4896, 6
https://tests.stockfishchess.org/tests/view/679d368b0774dfd78deb0163
closes https://github.com/official-stockfish/Stockfish/pull/5843
Bench: 2399312
2025-02-02 13:44:22 +01:00
Stefan Geschwentner
c83ddd9e4b
Tweak correction history factors
...
The values are taken from this tuning
https://tests.stockfishchess.org/tests/view/679c4e150774dfd78deaf376
which added also a new material correction history. The full tune
doesn't work but ignoring the new history results in this changes.
Passed STC:
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 102368 W: 27057 L: 26638 D: 48673
Ptnml(0-2): 394, 12031, 25949, 12382, 428
https://tests.stockfishchess.org/tess/view/679d2ca70774dfd78deaf796
Passed LTC:
LLR: 2.96 (-2.94,2.94) <0.50,2.50>
Total: 55044 W: 14215 L: 13855 D: 26974
Ptnml(0-2): 43, 5956, 15172, 6300, 51
https://tests.stockfishchess.org/tests/view/679d30be0774dfd78deafda2
closes https://github.com/official-stockfish/Stockfish/pull/5841
Bench: 3068583
2025-02-02 13:43:32 +01:00
Daniel Monroe
7690fac5cf
Simp probcut disable condition
...
Disable probcut check when we the ttValue is not at least probCutBeta,
regardless of tt depth.
Passed simplification STC
LLR: 2.92 (-2.94,2.94) <-1.75,0.25>
Total: 60896 W: 16030 L: 15835 D: 29031
Ptnml(0-2): 220, 7164, 15507, 7315, 242
https://tests.stockfishchess.org/tests/view/679c0a3251037ccaf3e3141e
Passed simplification LTC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 76644 W: 19557 L: 19392 D: 37695
Ptnml(0-2): 50, 8486, 21104, 8613, 69
https://tests.stockfishchess.org/tests/view/679c380b0774dfd78deaf35c
closes https://github.com/official-stockfish/Stockfish/pull/5840
Bench: 3543770
2025-02-02 13:39:47 +01:00
Michael Chaly
40e0486d02
Make IIR for PvNodes less aggressive
...
In line with previous experiments on improving scaling of IIR.
Now it disables IIR for pv nodes with depth <= 2, so disallowing for it
to perform a qsearch dive.
Fixed games STC:
https://tests.stockfishchess.org/tests/view/679ae6a951037ccaf3e30fb3
Elo: -10.36 ± 2.5 (95%) LOS: 0.0%
Total: 20020 W: 4902 L: 5499 D: 9619
Ptnml(0-2): 128, 2653, 4976, 2194, 59
Passed VVLTC with STC bounds:
https://tests.stockfishchess.org/tests/view/67954f2e406a4efe9eb7d266
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 196758 W: 50725 L: 50258 D: 95775
Ptnml(0-2): 21, 18153, 61564, 18620, 21
Passed VVLTC with LTC bounds:
https://tests.stockfishchess.org/tests/view/6795a26bf6281b7d7b18698b
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 323092 W: 83679 L: 82857 D: 156556
Ptnml(0-2): 48, 29475, 101659, 30335, 29
closes https://github.com/official-stockfish/Stockfish/pull/5834
Bench: 3464332
2025-02-02 13:37:47 +01:00
Daniel Monroe
5ef1f2b132
Refactor prior reduction
...
Make index of reduction consistent with rest of Stack
closes https://github.com/official-stockfish/Stockfish/pull/5832
No functional change
2025-02-02 13:36:58 +01:00
Carlos Esparza
7684b6e4d8
Don't increase rule50 when doing null moves
...
also prefetch a bit earlier while we're at it
passed STC: https://tests.stockfishchess.org/tests/view/678c0860f4dc0a8b4ae8cf58
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 67328 W: 17608 L: 17418 D: 32302
Ptnml(0-2): 256, 7905, 17156, 8087, 260
passed LTC: https://tests.stockfishchess.org/tests/view/678c1a56f4dc0a8b4ae8cfb1
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 340896 W: 86577 L: 86685 D: 167634
Ptnml(0-2): 291, 38325, 93332, 38201, 299
closes https://github.com/official-stockfish/Stockfish/pull/5831
Bench: 1910281
2025-02-02 13:35:48 +01:00
Shawn Xu
4a77fb213f
Clean up corrhist
...
Passed Non-regression STC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 89056 W: 23225 L: 23067 D: 42764
Ptnml(0-2): 292, 9688, 24470, 9726, 352
https://tests.stockfishchess.org/tests/view/679816b2ae346be6da0ee8e7
closes https://github.com/official-stockfish/Stockfish/pull/5830
Bench: 1767398
2025-02-02 13:33:35 +01:00
FauziAkram
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
Robert Nurnberg @ elitebook
c180163540
Update fastchess CI Version
...
This PR updates the fastchess version used as part of the CI to the one
used on fishtest, see
https://github.com/official-stockfish/fishtest/pull/2180 .
Also change the name/repo from fast-chess to fastchess.
closes https://github.com/official-stockfish/Stockfish/pull/5826
No functional change
2025-01-26 22:45:33 +01:00
Daniel Monroe
ebdc7ba2da
Refactor prior countermove bonus
...
Passed simplification STC
LLR: 2.97 (-2.94,2.94) <-1.75,0.25>
Total: 155424 W: 40252 L: 40159 D: 75013
Ptnml(0-2): 511, 18655, 39328, 18666, 552
https://tests.stockfishchess.org/tests/view/6794084fe96bfb672ad18d90
Passed rebased simplification LTC
LLR: 2.97 (-2.94,2.94) <-1.75,0.25>
Total: 103944 W: 26567 L: 26427 D: 50950
Ptnml(0-2): 69, 11640, 28418, 11772, 73
https://tests.stockfishchess.org/tests/view/67955c9a406a4efe9eb7d7e4
closes https://github.com/official-stockfish/Stockfish/pull/5825
Bench: 1839554
2025-01-26 22:43:02 +01:00
Nonlinear2
a016abd698
Decrease all stats malus according to move count
...
Passed STC:
https://tests.stockfishchess.org/tests/view/6794c4634f7de645171fb341
LLR: 2.95 (-2.94,2.94) <0.00,2.00>
Total: 28096 W: 7412 L: 7106 D: 13578
Ptnml(0-2): 97, 3194, 7148, 3524, 85
Passed LTC:
https://tests.stockfishchess.org/tests/view/6794ea13406a4efe9eb7d06b
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 58086 W: 15049 L: 14684 D: 28353
Ptnml(0-2): 27, 6344, 15957, 6667, 48
closes https://github.com/official-stockfish/Stockfish/pull/5823
Bench: 1711170
2025-01-26 22:42:41 +01:00
Martin Novák
831cb01cea
Remove major corrhist
...
Remove major correction history and slightly increase all other
correction weights.
Passed STC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 50080 W: 13171 L: 12959 D: 23950
Ptnml(0-2): 196, 5998, 12462, 6166, 218
https://tests.stockfishchess.org/tests/live_elo/67954526406a4efe9eb7d176
Passed LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 51504 W: 13188 L: 12995 D: 25321
Ptnml(0-2): 54, 5658, 14128, 5865, 47
https://tests.stockfishchess.org/tests/live_elo/67954961406a4efe9eb7d251
closes https://github.com/official-stockfish/Stockfish/pull/5822
Bench: 2081366
2025-01-26 22:41:00 +01:00
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
