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
Daniel Monroe
a944f08225
retroactive reduction decrease if eval improves
...
If the previous reduction was large but the static eval improves then increase the search depth. This patch looks at the next node when calculating the reduction, something I don't think has been done before and which can probably used for further elo gaining patches.
Passed STC
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 55936 W: 14813 L: 14462 D: 26661
Ptnml(0-2): 220, 6565, 14094, 6822, 267
https://tests.stockfishchess.org/tests/view/67845b70460e2910c51ddcff
Passed LTC
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 189468 W: 48411 L: 47773 D: 93284
Ptnml(0-2): 180, 20801, 52131, 21445, 177
https://tests.stockfishchess.org/tests/view/6784e2cb460e2910c51ddf86
closes https://github.com/official-stockfish/Stockfish/pull/5785
bench: 1512884
2025-01-18 20:50:04 +01:00
FauziAkram
69ec5dcbfc
Remove the type of moved piece from the evasion capture movepick formula
...
In the move generation the moves are generated in the order pawns, knight, bishops, rooks, queens and king.
This follows increasing type_of(pos.moved_piece(m)) term, so in master a capturing was sorted after a capturing rook if the same piece was captured in evasion.
Because we use a stable sorting method (stable means the order of elements with the same value are not changed) and generate the moves in the above order we do'nt need the removed term.
Passed STC:
LLR: 2.98 (-2.94,2.94) <-1.75,0.25>
Total: 170560 W: 44222 L: 44148 D: 82190
Ptnml(0-2): 569, 18792, 46488, 18858, 573
https://tests.stockfishchess.org/tests/view/678530ee460e2910c51de21d
closes https://github.com/official-stockfish/Stockfish/pull/5784
No functional change
2025-01-18 20:44:04 +01:00
