Nonlinear2 and Joost VandeVondele
8da3c2155a
Simplify NMP eval in qsearch
...
Passed non-regression STC:
https://tests.stockfishchess.org/tests/view/6834e9436ec7634154f9cd6e
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 24864 W: 6626 L: 6394 D: 11844
Ptnml(0-2): 62, 2806, 6477, 3012, 75
Passed non-regression LTC:
https://tests.stockfishchess.org/tests/view/683598fd6ec7634154f9ce82
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 200148 W: 51461 L: 51424 D: 97263
Ptnml(0-2): 92, 21672, 56503, 21721, 86
closes https://github.com/official-stockfish/Stockfish/pull/6109
Bench: 2316591
2025-06-02 21:44:29 +02:00
b1b5893a8e
Minor code improvements
...
- Remove / add empty lines
- fix the `ttcapture` comment
- remove the `bonus` variable for `ttMoveHistory`
- remove unnecessary parentheses / brackets
- refactor the movepick good quiet stage
- rename `endMoves` to `endCur`, as the previous name suggests that it points to the end of all generated moves, which it does not.
closes https://github.com/official-stockfish/Stockfish/pull/6089
No functional change.
Co-Authored-By: xu-shawn <50402888+xu-shawn@users.noreply.github.com >
2025-05-25 20:59:27 +02:00
Nonlinear2 and Joost VandeVondele
54fb42ddf8
clean up code
...
**Non functional changes:**
in search.cpp:
- an unnecessary pair of parenthesis in the IIR condition has been removed.
- refactored the stalemate trap detection code
in movepick.cpp:
- use the variables `from`, `to`, `piece`, `pieceType` and `capturedPiece` instead of calling the same functions multiple times in `MovePicker::score()`.
- rename `MovePicker::other_piece_types_mobile()`.
**Functional changes:**
- make sure the processed move is always legal in `MovePicker::other_piece_types_mobile()`.
passed non regression STC:
https://tests.stockfishchess.org/tests/view/6829da686ec7634154f99faf
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 95680 W: 24962 L: 24820 D: 45898
Ptnml(0-2): 221, 9622, 28025, 9738, 234
Passed non regression LTC:
https://tests.stockfishchess.org/tests/view/682a102c6ec7634154f9a086
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 117666 W: 30065 L: 29957 D: 57644
Ptnml(0-2): 45, 10173, 38291, 10277, 47
Run of 10k games on the stalemate opening book:
https://tests.stockfishchess.org/tests/view/682b114e6ec7634154f9aa2d
Elo: 0.76 ± 0.9 (95%) LOS: 95.3%
Total: 10000 W: 4637 L: 4615 D: 748
Ptnml(0-2): 0, 75, 4828, 97, 0
nElo: 5.83 ± 6.8 (95%) PairsRatio: 1.29
closes https://github.com/official-stockfish/Stockfish/pull/6080
Bench: 2422771
2025-05-21 07:25:40 +02:00
Nonlinear2 and Joost VandeVondele
0dcfe096d6
Increase full depth search reduction when cutNode
...
In addition to the core patch, improve the use of `isTTMove`:
- this name was used to mean both `bestMove == ttData.move` and `move == ttData.move`, so i replaced the argument `isTTMove` of `update_all_stats` with `TTMove` directly.
- `ttData.move == move` was still used in some places instead of `ss->isTTMove`. I replaced these to be more consistent.
Passed STC:
https://tests.stockfishchess.org/tests/view/68057b8f98cd372e3aea3472
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 38400 W: 10048 L: 9734 D: 18618
Ptnml(0-2): 102, 4360, 9956, 4686, 96
Passed LTC:
https://tests.stockfishchess.org/tests/view/68057f7c98cd372e3aea3842
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 312666 W: 79494 L: 78616 D: 154556
Ptnml(0-2): 144, 33809, 87563, 34659, 158
closes https://github.com/official-stockfish/Stockfish/pull/6007
Bench: 1623376
2025-04-26 22:11:40 +02:00
Nonlinear2 and Disservin
43d8ccf856
change the bonusScale depth component
...
Passed STC:
https://tests.stockfishchess.org/tests/view/67d35f66517865b4a2dfc801
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 110816 W: 28875 L: 28449 D: 53492
Ptnml(0-2): 329, 13064, 28231, 13420, 364
Passed LTC:
https://tests.stockfishchess.org/tests/view/67d4bdf0517865b4a2dfd131
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 121824 W: 31047 L: 30559 D: 60218
Ptnml(0-2): 52, 13056, 34214, 13532, 58
closes https://github.com/official-stockfish/Stockfish/pull/5932
Bench: 2128807
2025-03-21 11:21:10 +01:00
Nonlinear2 and Disservin
fc2139fedc
se separate parameters for stat values
...
The code has been refactored to remove the `stat_bonus` and `stat_malus`
functions, as the code for each bonus/malus is now different. This
allows for future tests to modify these formulas individually.
Passed LTC with STC bounds:
https://tests.stockfishchess.org/tests/view/67b115dd6c6b9e172ad1592f
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 75756 W: 19393 L: 19044 D: 37319
Ptnml(0-2): 60, 8251, 20913, 8588, 66
Passed LTC with LTC bounds:
https://tests.stockfishchess.org/tests/view/67af5f5d6c6b9e172ad15765
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 108126 W: 27880 L: 27412 D: 52834
Ptnml(0-2): 85, 11786, 29866, 12228, 98
closes https://github.com/official-stockfish/Stockfish/pull/5887
Bench: 2809143
2025-02-24 19:09:28 +01:00
Nonlinear2 and Disservin
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
Nonlinear2 and Disservin
9ed1725e78
Simplify bonusScale formula
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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 and Disservin
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
Nonlinear2 and Disservin
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
Nonlinear2 and Joost VandeVondele
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
Nonlinear2 and Joost VandeVondele
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
Nonlinear2 and GitHub
cf10644d6e
Fix duplicate code ( #5711 )
...
closes https://github.com/official-stockfish/Stockfish/pull/5711
No functional change
2024-12-08 22:24:29 +01:00
Nonlinear2 and Disservin
da82942b54
Add functions to check for decisive scores
...
Thanks to peregrineshahin and robbyrobbyrob for their suggestions.
closes https://github.com/official-stockfish/Stockfish/pull/5696
No functional change
2024-12-08 19:48:49 +01:00
Nonlinear2 and Disservin
57e06be71f
Add functions to check for decisive scores
...
Thanks to peregrineshahin and robbyrobbyrob for their suggestions.
closes https://github.com/official-stockfish/Stockfish/pull/5696
No functional change
2024-12-08 19:47:02 +01:00
Nonlinear2 and Disservin
43e100ae06
Use cutnode as TT Cutoff Condition
...
At low enough depths, fail high with TT only when expected cutnode.
Passed STC:
https://tests.stockfishchess.org/tests/view/6726357b86d5ee47d953da8c
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 41184 W: 10873 L: 10551 D: 19760
Ptnml(0-2): 131, 4728, 10554, 5046, 133
Passed LTC:
https://tests.stockfishchess.org/tests/view/6727326a86d5ee47d953db30
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 270888 W: 69040 L: 68243 D: 133605
Ptnml(0-2): 180, 29385, 75485, 30246, 148
closes https://github.com/official-stockfish/Stockfish/pull/5670
Bench: 805776
2024-11-13 20:35:02 +01:00
Nonlinear2 and Disservin
aaadbe0572
Introduce mean squared score for delta adjustments
...
This patch introduces the value `meanSquaredScore`, which makes the
initial delta sensitive to unstable iterative deepening scores.
Passed STC:
https://tests.stockfishchess.org/tests/view/66fed74286d5ee47d953bb42
LLR: 2.98 (-2.94,2.94) <0.00,2.00>
Total: 71104 W: 18635 L: 18262 D: 34207
Ptnml(0-2): 234, 8365, 17993, 8714, 246
Passed LTC:
https://tests.stockfishchess.org/tests/view/6700088e86d5ee47d953bbe9
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 212544 W: 54238 L: 53560 D: 104746
Ptnml(0-2): 120, 23093, 59172, 23763, 124
closes https://github.com/official-stockfish/Stockfish/pull/5627
Bench: 1395505
2024-10-12 16:40:37 +02:00
Nonlinear2 and Joost VandeVondele
aff1f67997
simplify see pruning in qsearch
...
passed non-regression STC:
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 34880 W: 9193 L: 8968 D: 16719
Ptnml(0-2): 103, 4047, 8935, 4232, 123
https://tests.stockfishchess.org/tests/view/66ee83bd86d5ee47d953b15b
passed non-regression LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 69126 W: 17529 L: 17357 D: 34240
Ptnml(0-2): 41, 7507, 19285, 7699, 31
https://tests.stockfishchess.org/tests/view/66ef3e0386d5ee47d953b1d3
closes https://github.com/official-stockfish/Stockfish/pull/5607
Bench: 1339840
2024-09-28 17:22:33 +02:00
Nonlinear2 and Disservin
d8e49cdbdd
Remove the moveCount increase in the LMR condition.
...
Passed non-regression STC:
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 87104 W: 22630 L: 22464 D: 42010
Ptnml(0-2): 316, 10295, 22132, 10525, 284
https://tests.stockfishchess.org/tests/view/66dccd00dc53972b68218c60
Passed non-regression LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 94050 W: 23869 L: 23722 D: 46459
Ptnml(0-2): 49, 10400, 25985, 10537, 54
https://tests.stockfishchess.org/tests/view/66dd69c7dc53972b68218ca5
closes https://github.com/official-stockfish/Stockfish/pull/5582
Bench: 1281840
2024-09-10 22:59:27 +02:00
Nonlinear2 and Joost VandeVondele
6cf7f300ac
Simplify stand pat adjustement
...
Remove && !PvNode condition for stand pat adjustement in quiescence search.
Passed non-regression STC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 108544 W: 28228 L: 28085 D: 52231
Ptnml(0-2): 389, 12902, 27554, 13031, 396
https://tests.stockfishchess.org/tests/view/66bb402e4ff211be9d4ee688
Passed non-regression LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 193014 W: 48796 L: 48751 D: 95467
Ptnml(0-2): 188, 21481, 53116, 21542, 180
https://tests.stockfishchess.org/tests/view/66bc78774ff211be9d4ee88f
closes https://github.com/official-stockfish/Stockfish/pull/5538
Bench 1787360
2024-08-20 21:31:33 +02:00
