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
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
