e770b55f7f
Remove Extraneous Parenthesis
...
No longer needed after
https://github.com/official-stockfish/Stockfish/pull/5667 .
closes https://github.com/official-stockfish/Stockfish/pull/5717
No functional change
2024-12-22 15:17:33 +01:00
b822fdf2f2
Tune histories
...
Passed STC:
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 268736 W: 70080 L: 69421 D: 129235
Ptnml(0-2): 831, 31795, 68460, 32448, 834
https://tests.stockfishchess.org/tests/view/6750778886d5ee47d9540e7c
Passed LTC:
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 505356 W: 129145 L: 127868 D: 248343
Ptnml(0-2): 307, 54901, 140959, 56230, 281
https://tests.stockfishchess.org/tests/view/675367de86d5ee47d9541536
closes https://github.com/official-stockfish/Stockfish/pull/5712
Bench: 1148169
2024-12-22 15:14:22 +01:00
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
afaf3a0f2a
Refine statscore for captures
...
Continuation of previous attempts there.
Now instead of using capture history with a static offset also add the
value of the captured piece in the same way at it is used in movepicker.
Passed STC:
https://tests.stockfishchess.org/tests/view/674aa3d386d5ee47d95404aa
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 116480 W: 30433 L: 29999 D: 56048
Ptnml(0-2): 361, 13720, 29662, 14118, 379
Passed LTC:
https://tests.stockfishchess.org/tests/view/674c4b2d86d5ee47d954073f
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 133542 W: 34365 L: 33847 D: 65330
Ptnml(0-2): 78, 14585, 36934, 15089, 85
closes https://github.com/official-stockfish/Stockfish/pull/5706
Bench: 934447
2024-12-08 19:57:59 +01:00
6a8478c6ad
Simplify Prior Capture Countermove Bonus
...
Passed Non-regression STC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 184032 W: 47626 L: 47568 D: 88838
Ptnml(0-2): 590, 21808, 47238, 21714, 666
https://tests.stockfishchess.org/tests/view/67412c7686d5ee47d953f743
Passed Non-regression LTC:
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 169218 W: 43395 L: 43323 D: 82500
Ptnml(0-2): 302, 18567, 46791, 18655, 294
https://tests.stockfishchess.org/tests/view/6743b7e086d5ee47d953f9a6
closes https://github.com/official-stockfish/Stockfish/pull/5701
Bench: 1130692
2024-12-08 19:55:10 +01:00
713000c517
Same weight for black and white nonPawnCorrection history
...
Since we don't have color dependent parameters in NNUE eval, it also has
no sense IMO to have color dependent parameters in correction histories.
Ideally a fixed depth search on a single thread should be determistic,
so delivering the same result (move) if we just flip colors on the
board.
Patch replaces 2 parameters (122 and 185) with just one value 154 (= the avg of the two).
Passed STC-non regression
https://tests.stockfishchess.org/tests/view/6740a63286d5ee47d953f656
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 122336 W: 31499 L: 31372 D: 59465
Ptnml(0-2): 336, 14535, 31301, 14658, 338
Passed LTC-non regression
https://tests.stockfishchess.org/tests/view/67419bae86d5ee47d953f7b6
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 101400 W: 25870 L: 25731 D: 49799
Ptnml(0-2): 78, 11109, 28166, 11290, 57
closes https://github.com/official-stockfish/Stockfish/pull/5698
Bench: 1215483
2024-12-08 19:52:16 +01:00
d5a36a3c92
Simplify probCutBeta formula
...
After recent changes to the improving definition, seems like there is no
need anymore to keep opponentWorsening in the probCutBeta formula.
Passed STC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 214272 W: 55566 L: 55541 D: 103165
Ptnml(0-2): 620, 25540, 54817, 25513, 646
https://tests.stockfishchess.org/tests/view/6735243d86d5ee47d953eaea
Passed LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 126708 W: 32329 L: 32216 D: 62163
Ptnml(0-2): 68, 13986, 35123, 14119, 58
https://tests.stockfishchess.org/tests/view/67393cf686d5ee47d953ef99
closes https://github.com/official-stockfish/Stockfish/pull/5697
Bench: 983067
2024-12-08 19:49:01 +01:00
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
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
70bb317afe
Bonus for a prior capture that causes a fail low.
...
This tweak adds a bonus equal to twice the stat_bonus for the current depth for a prior capture that caused a fail high, similar to the prior countermove bonus we currently have.
Passed STC
https://tests.stockfishchess.org/tests/view/673bc14b86d5ee47d953f1f2
LLR: 2.95 (-2.94,2.94) <0.00,2.00>
Total: 105824 W: 27538 L: 27118 D: 51168
Ptnml(0-2): 358, 12370, 27024, 12814, 346
Passed LTC
https://tests.stockfishchess.org/tests/view/673ccbff86d5ee47d953f2d9
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 134502 W: 34340 L: 33820 D: 66342
Ptnml(0-2): 102, 14634, 37229, 15214, 72
closes https://github.com/official-stockfish/Stockfish/pull/5695
Bench: 1107054
2024-12-08 19:46:07 +01:00
fb6be17ad4
Simplify statscore at captures
...
Simplify statscores for captures, setting them to 0
A recent tweak of Vizvezdenec finds substantial elo gain from giving
captures a separate statscore, which is used mainly for reductions. The
idea is that the old combination of quiet histories was inappropriate
and that a value based on the capture history is more suitable. This
simplification sets the statscore for captures to 0, suggesting that the
elo gain came from rectifying the quiet history/capture mismatch.
Passed STC (against a slightly older version of Viz's patch)
https://tests.stockfishchess.org/tests/view/673ac6e286d5ee47d953f0ec
LR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 57312 W: 14872 L: 14672 D: 27768
Ptnml(0-2): 152, 6761, 14649, 6923, 171
Passed LTC (against Viz's newest patch)
https://tests.stockfishchess.org/tests/view/673cd00686d5ee47d953f2db
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 88236 W: 22510 L: 22358 D: 43368
Ptnml(0-2): 70, 9530, 24745, 9724, 49
closes https://github.com/official-stockfish/Stockfish/pull/5691
Bench: 959947
2024-11-22 23:34:15 +01:00
4fcd78ceb4
Simplify Probcut Bonus
...
Passed STC:
LLR: 2.99 (-2.94,2.94) <-1.75,0.25>
Total: 172288 W: 44656 L: 44580 D: 83052
Ptnml(0-2): 507, 20650, 43782, 20670, 535
https://tests.stockfishchess.org/tests/view/673b74f986d5ee47d953f1a3
Passed LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 94596 W: 24098 L: 23953 D: 46545
Ptnml(0-2): 57, 10322, 26393, 10471, 55
https://tests.stockfishchess.org/tests/view/673d191886d5ee47d953f337
closes https://github.com/official-stockfish/Stockfish/pull/5688
Bench: 1031022
2024-11-22 23:31:34 +01:00
cd3c13a883
Further tweak statscore for captures
...
Even lower offset.
Passed STC:
https://tests.stockfishchess.org/tests/view/673a66d786d5ee47d953f070
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 63776 W: 16570 L: 16216 D: 30990
Ptnml(0-2): 178, 7371, 16478, 7641, 220
Passed LTC:
https://tests.stockfishchess.org/tests/view/673b2e2a86d5ee47d953f14b
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 156960 W: 39999 L: 39435 D: 77526
Ptnml(0-2): 96, 16965, 43803, 17511, 105
closes https://github.com/official-stockfish/Stockfish/pull/5686
Bench: 867931
2024-11-22 23:29:37 +01:00
d29c8bd5d4
Rewrite of 'Adjust correction history' condition
...
Current condition is convoluted and hard to understand because of
several negations. Also added 2 comments to make the concept behind the
condition better understandable.
closes https://github.com/official-stockfish/Stockfish/pull/5685
No functional change
2024-11-22 23:24:15 +01:00
0282edc0b0
Simplify bonus formula
...
Give full bonus instead of half.
Passed STC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 23872 W: 6254 L: 6018 D: 11600
Ptnml(0-2): 80, 2691, 6152, 2939, 74
https://tests.stockfishchess.org/tests/view/673b709686d5ee47d953f19d
Passed LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 42894 W: 10924 L: 10725 D: 21245
Ptnml(0-2): 30, 4592, 12011, 4777, 37
https://tests.stockfishchess.org/tests/view/673bb50386d5ee47d953f1eb
closes https://github.com/official-stockfish/Stockfish/pull/5683
Bench: 836558
2024-11-22 23:23:42 +01:00
f129bf0de9
Tweak statscore for captures
...
Followup of a recent patch that separated statscore for captures and non-captures.
Lower value that we subtract from statscore if a move is a capture.
Passed STC:
https://tests.stockfishchess.org/tests/view/67385b6786d5ee47d953eeba
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 50592 W: 13223 L: 12888 D: 24481
Ptnml(0-2): 154, 5853, 12931, 6220, 138
Passed LTC:
https://tests.stockfishchess.org/tests/view/6739056e86d5ee47d953ef3f
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 23598 W: 6155 L: 5862 D: 11581
Ptnml(0-2): 16, 2466, 6543, 2757, 17
closes https://github.com/official-stockfish/Stockfish/pull/5682
Bench: 771180
2024-11-22 23:12:43 +01:00
82b092ca48
Adjust statscore for captures
...
Instead of using quiet histories use capture history with a different
offset.
Passed STC:
https://tests.stockfishchess.org/tests/view/6731d5cc86d5ee47d953e719
LLR: 2.96 (-2.94,2.94) <0.00,2.00>
Total: 428896 W: 111160 L: 110269 D: 207467
Ptnml(0-2): 1220, 50296, 110534, 51169, 1229
Passed LTC:
https://tests.stockfishchess.org/tests/view/6733d9fd86d5ee47d953e962
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 105882 W: 26918 L: 26458 D: 52506
Ptnml(0-2): 66, 11430, 29482, 11904, 59
closes https://github.com/official-stockfish/Stockfish/pull/5679
Bench: 840721
2024-11-13 20:35:02 +01:00
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
3d084e9164
VVLTC Search Tune
...
A single tuning run of 190k games was conducted:
https://tests.stockfishchess.org/tests/view/670f3e3786d5ee47d953c554 .
Passed VVLTC 1st sprt:
https://tests.stockfishchess.org/tests/view/672344dc86d5ee47d953d8c3
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 56768 W: 14615 L: 14323 D: 27830
Ptnml(0-2): 3, 5152, 17789, 5430, 10
Passed VVLTC 2nd sprt (rebased):
https://tests.stockfishchess.org/tests/view/6726d83786d5ee47d953db03
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 57884 W: 14885 L: 14554 D: 28445
Ptnml(0-2): 5, 5300, 17999, 5635, 3
closes https://github.com/official-stockfish/Stockfish/pull/5669
Bench: 920336
2024-11-13 20:34:53 +01:00
cc5c67c564
Introduce Fractional LMR
...
Tuning Run (90k Games):
https://tests.stockfishchess.org/tests/view/67202b1c86d5ee47d953d442
Passed STC:
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 241024 W: 62616 L: 62001 D: 116407
Ptnml(0-2): 716, 28231, 62015, 28822, 728
https://tests.stockfishchess.org/tests/view/6725196786d5ee47d953d9f2
Passed LTC:
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 92532 W: 23678 L: 23246 D: 45608
Ptnml(0-2): 45, 9981, 25797, 10383, 60
https://tests.stockfishchess.org/tests/view/6727d3cb86d5ee47d953db9d
closes https://github.com/official-stockfish/Stockfish/pull/5667
Bench: 1066071
2024-11-13 20:12:47 +01:00
54cf226604
Revert VLTC regression from #5634
...
https://tests.stockfishchess.org/tests/view/671bf61b86d5ee47d953cf23
And thanks to @xu-shawn for suggesting running a VLTC regress test since
depth modifications affect scaling. Also, the LTC was showing a slight
regress after 680+k games ~= -0.34 , for reference:
https://tests.stockfishchess.org/tests/view/67042b1f86d5ee47d953be7c
closes https://github.com/official-stockfish/Stockfish/pull/5663
Bench: 1307308
2024-11-13 20:09:13 +01:00
ecf5646f6e
Refine definition of improving
...
This patch also allows improving flag to be true if static evaluation of
the position is good enough.
Passed STC:
https://tests.stockfishchess.org/tests/view/6720906086d5ee47d953d4d0
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 34816 W: 9172 L: 8858 D: 16786
Ptnml(0-2): 113, 3988, 8887, 4312, 108
Passed LTC:
https://tests.stockfishchess.org/tests/view/6721162686d5ee47d953d597
LLR: 2.96 (-2.94,2.94) <0.50,2.50>
Total: 145374 W: 37118 L: 36574 D: 71682
Ptnml(0-2): 91, 15875, 40212, 16417, 92
closes https://github.com/official-stockfish/Stockfish/pull/5662
Bench: 1518856
2024-11-13 20:08:14 +01:00
c2611efe5c
Move history code to a separate header
...
Since no correction histories are ever used inside Movepick, and many
existing histories are closely integrated into search, it might be more
logical to separate them into their own header. PR based on #5650
closes https://github.com/official-stockfish/Stockfish/pull/5652
No functional change
2024-11-13 20:07:15 +01:00
24c57793e1
Remove moveCountPruning in search.cpp
...
The definition of moveCountPruning may cause confusion by implying that
the variable is unconstrained. However, once it is set to true, it
should not be reset to false, otherwise it would break the internal
logic of MovePicker.
Several patches have overlooked this constraint. For example:
https://tests.stockfishchess.org/tests/view/671e7c0486d5ee47d953d226
https://tests.stockfishchess.org/tests/view/66a1de7b4ff211be9d4eccea
The implementation approach was suggested by Disservin.
Passed non-regression STC:
LLR: 3.02 (-2.94,2.94) <-1.75,0.25>
Total: 180672 W: 47072 L: 47006 D: 86594
Ptnml(0-2): 536, 19482, 50247, 19522, 549
https://tests.stockfishchess.org/tests/view/6720df6f86d5ee47d953d542
closes https://github.com/official-stockfish/Stockfish/pull/5661
No functional change
2024-10-31 10:08:34 +01:00
8681d3c2b3
Simplify Time Management Formula
...
Decreasing the number of operations
Passed STC:
LLR: 2.97 (-2.94,2.94) <-1.75,0.25>
Total: 38880 W: 10038 L: 9823 D: 19019
Ptnml(0-2): 92, 4334, 10395, 4505, 114
https://tests.stockfishchess.org/tests/view/67112bf586d5ee47d953c6be
Passed LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 242844 W: 61425 L: 61431 D: 119988
Ptnml(0-2): 145, 25175, 70797, 25151, 154
https://tests.stockfishchess.org/tests/view/6712387486d5ee47d953c737
closes https://github.com/official-stockfish/Stockfish/pull/5655
Bench: 1281912
2024-10-31 10:07:24 +01:00
8ef403c786
Small cleanup for stats adjustments
...
After some simplifications bonuses and maluses are the same for quiet
and non-quiet moves so it makes no sense to use quietMoveBonus/Malus,
instead use just bonus/malus.
closes https://github.com/official-stockfish/Stockfish/pull/5649
No functional change
2024-10-31 09:26:00 +01:00
2ce47573b4
Remove -stat_malus(newDepth)
...
Passed STC:
LLR: 2.97 (-2.94,2.94) <-1.75,0.25>
Total: 92544 W: 23940 L: 23778 D: 44826
Ptnml(0-2): 286, 10936, 23638, 11154, 258
https://tests.stockfishchess.org/tests/view/670c3d6986d5ee47d953c30b
Passed LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 43164 W: 10986 L: 10786 D: 21392
Ptnml(0-2): 27, 4713, 11905, 4907, 30
https://tests.stockfishchess.org/tests/view/670eda3d86d5ee47d953c51d
closes https://github.com/official-stockfish/Stockfish/pull/5639
Bench: 1281912
2024-10-31 09:25:59 +01:00
b325b2c348
Simplify bestValue formula
...
Passed STC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 45888 W: 12051 L: 11841 D: 21996
Ptnml(0-2): 123, 5356, 11807, 5504, 154
https://tests.stockfishchess.org/tests/view/670bb89086d5ee47d953c2d8
Passed LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 51336 W: 13021 L: 12830 D: 25485
Ptnml(0-2): 34, 5594, 14227, 5773, 40
https://tests.stockfishchess.org/tests/view/670c587f86d5ee47d953c31b
closes https://github.com/official-stockfish/Stockfish/pull/5637
Bench: 1192999
2024-10-31 09:25:59 +01:00
7f386d109e
Remove material corrHist
...
Passed STC:
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 80832 W: 21150 L: 20975 D: 38707
Ptnml(0-2): 283, 9531, 20598, 9736, 268
https://tests.stockfishchess.org/tests/view/670302fe86d5ee47d953bd68
Passed LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 46008 W: 11621 L: 11423 D: 22964
Ptnml(0-2): 30, 5072, 12606, 5262, 34
https://tests.stockfishchess.org/tests/view/6704074686d5ee47d953be53
Passed LTC Rebased:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 95814 W: 24340 L: 24195 D: 47279
Ptnml(0-2): 71, 10497, 26602, 10690, 47
https://tests.stockfishchess.org/tests/view/670ae1ac86d5ee47d953c262
closes https://github.com/official-stockfish/Stockfish/pull/5636
Bench: 1119774
2024-10-31 09:25:56 +01:00
bf2a0d5392
Simplify internal iterative reductions
...
Passed STC:
LLR: 2.92 (-2.94,2.94) <-1.75,0.25>
Total: 138656 W: 36182 L: 36074 D: 66400
Ptnml(0-2): 523, 16422, 35310, 16570, 503
https://tests.stockfishchess.org/tests/view/6702beb386d5ee47d953bd41
Passed LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 680844 W: 172021 L: 172480 D: 336343
Ptnml(0-2): 492, 76259, 187419, 75720, 532
https://tests.stockfishchess.org/tests/view/67042b1f86d5ee47d953be7c
closes https://github.com/official-stockfish/Stockfish/pull/5634
Bench: 1169252
2024-10-31 09:13:35 +01:00
9766db8139
Make low ply history size fixed
...
Size of low ply history should always be the same, so ensure it.
closes https://github.com/official-stockfish/Stockfish/pull/5630
No functional change
2024-10-12 16:40:55 +02:00
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
9a21e3e996
Simplify bestvalue formula
...
Passed STC:
LLR: 2.97 (-2.94,2.94) <-1.75,0.25>
Total: 163680 W: 42689 L: 42605 D: 78386
Ptnml(0-2): 619, 19555, 41386, 19683, 597
https://tests.stockfishchess.org/tests/view/66f9451386d5ee47d953b7d9
Passed LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 96498 W: 24582 L: 24438 D: 47478
Ptnml(0-2): 62, 10642, 26718, 10744, 83
https://tests.stockfishchess.org/tests/view/66fd765786d5ee47d953ba1c
closes https://github.com/official-stockfish/Stockfish/pull/5622
Bench: 1309815
2024-10-12 16:30:44 +02:00
3348603770
Simplify previous #5608
...
https://github.com/official-stockfish/Stockfish/pull/5608
STC: https://tests.stockfishchess.org/tests/view/66fb1bab86d5ee47d953b8cc
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 25536 W: 6797 L: 6560 D: 12179
Ptnml(0-2): 93, 2953, 6460, 3148, 114
LTC https://tests.stockfishchess.org/tests/view/66fb690e86d5ee47d953b8eb
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 225114 W: 57200 L: 57188 D: 110726
Ptnml(0-2): 197, 25076, 61995, 25096, 193
closes https://github.com/official-stockfish/Stockfish/pull/5621
Bench: 1570076
2024-10-12 16:30:44 +02:00
6592b13d56
Introduce Continuation Correction History
...
Continuation correction history uses last 2 move to correct static eval.
ContCorrHist first introduced by @martinnovaak in
Motor(https://github.com/martinnovaak/motor/pull/162 ). Earlier ideas
using last move to correct eval is introduced by @MinusKelvin in
Ice4(https://github.com/MinusKelvin/ice4/commit/45daf7d9ea64ea4efaf0d2b4e99f53e12e08c838 )
Passed STC:
LLR: 2.96 (-2.94,2.94) <0.00,2.00>
Total: 310144 W: 81267 L: 80538 D: 148339
Ptnml(0-2): 1160, 36607, 78834, 37286, 1185
https://tests.stockfishchess.org/tests/view/66f96cbc86d5ee47d953b7f7
Passed LTC:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 97470 W: 24892 L: 24447 D: 48131
Ptnml(0-2): 63, 10631, 26915, 11050, 76
https://tests.stockfishchess.org/tests/view/66fd59bc86d5ee47d953b9ea
closes https://github.com/official-stockfish/Stockfish/pull/5617
Bench: 1143382
2024-10-12 16:30:44 +02:00
81c1d31084
Decrease probCutBeta based on opponentWorsening
...
Passed STC:
LLR: 2.97 (-2.94,2.94) <0.00,2.00>
Total: 62112 W: 16305 L: 15947 D: 29860
Ptnml(0-2): 203, 7226, 15856, 7552, 219
https://tests.stockfishchess.org/tests/view/66f85fc986d5ee47d953b71e
Passed LTC:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 129552 W: 33223 L: 32710 D: 63619
Ptnml(0-2): 94, 14250, 35573, 14767, 92
https://tests.stockfishchess.org/tests/view/66f93fef86d5ee47d953b7d2
closes https://github.com/official-stockfish/Stockfish/pull/5615
bench: 1511354
2024-10-04 08:35:08 +02:00
7ac745a736
Refactor root history into low ply history
...
This patch changes root history to low ply history - butterfly history for plies < 4.
Doubles weight of this history for root, latter plies have lesser effect.
Passed STC:
https://tests.stockfishchess.org/tests/view/66f77d2386d5ee47d953b65d
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 180992 W: 47362 L: 46830 D: 86800
Ptnml(0-2): 554, 21499, 45928, 21891, 624
Passed LTC:
https://tests.stockfishchess.org/tests/view/66fb557986d5ee47d953b8e5
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 42462 W: 11013 L: 10682 D: 20767
Ptnml(0-2): 33, 4518, 11795, 4855, 30
closes https://github.com/official-stockfish/Stockfish/pull/5614
Bench 1264335
2024-10-04 08:32:21 +02:00
c85f802185
Tweak ttCapture reduction
...
More reduction at shallow depth for quiet moves when ttMove is a capture.
Passed STC:
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 365728 W: 95896 L: 95090 D: 174742
Ptnml(0-2): 1283, 43133, 93262, 43867, 1319
https://tests.stockfishchess.org/tests/view/66edd35986d5ee47d953b0d5
Passed LTC:
LLR: 2.96 (-2.94,2.94) <0.50,2.50>
Total: 200526 W: 51197 L: 50540 D: 98789
Ptnml(0-2): 119, 21952, 55462, 22613, 117
https://tests.stockfishchess.org/tests/view/66f405dc86d5ee47d953b460
closes https://github.com/official-stockfish/Stockfish/pull/5610
bench: 1269487
2024-10-01 20:59:17 +02:00
d6043970bd
Make Correction History Size Uniform
...
Passed Non-regression STC:
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 207232 W: 53834 L: 53802 D: 99596
Ptnml(0-2): 695, 24486, 53200, 24562, 673
https://tests.stockfishchess.org/tests/view/66e9f5a886d5ee47d953ada1
Passed Non-regression LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 99120 W: 25264 L: 25123 D: 48733
Ptnml(0-2): 66, 10803, 27675, 10956, 60
https://tests.stockfishchess.org/tests/view/66ed7ebc86d5ee47d953b056
Passed Non-regression LTC vs #5606 :
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 208950 W: 53049 L: 53019 D: 102882
Ptnml(0-2): 111, 23232, 57760, 23260, 112
https://tests.stockfishchess.org/tests/view/66f1843886d5ee47d953b2f2
closes https://github.com/official-stockfish/Stockfish/pull/5609
bench 1575189
2024-09-28 18:01:31 +02:00
56444ce1f7
Push expected cutting late moves up in the move ordering.
...
since the passing of the LMR verification is coming from a relatively late move
this means we have wasted some time trying/picking other moves, and it would
make sense to push it up in the move ordering for future positions not to be as
late.
Passed STC:
https://tests.stockfishchess.org/tests/view/66f0f69186d5ee47d953b2aa
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 34144 W: 9024 L: 8709 D: 16411
Ptnml(0-2): 137, 3875, 8732, 4192, 136
Passed LTC:
https://tests.stockfishchess.org/tests/view/66f1d84a86d5ee47d953b325
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 62808 W: 16054 L: 15684 D: 31070
Ptnml(0-2): 24, 6725, 17555, 7057, 43
closes https://github.com/official-stockfish/Stockfish/pull/5608
bench: 1452807
2024-09-28 18:01:31 +02:00
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
ae420e735f
Tweak Correction histories
...
tune parameters some more, adjust scores updated for each history
passed STC:
https://tests.stockfishchess.org/tests/view/66ea569186d5ee47d953ae48
LLR: 2.92 (-2.94,2.94) <0.00,2.00>
Total: 36288 W: 9660 L: 9344 D: 17284
Ptnml(0-2): 110, 4207, 9220, 4471, 136
passed LTC:
https://tests.stockfishchess.org/tests/view/66ea9b4e86d5ee47d953ae6f
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 241446 W: 61748 L: 61010 D: 118688
Ptnml(0-2): 173, 26211, 67202, 26979, 158
closes https://github.com/official-stockfish/Stockfish/pull/5606
Bench: 1677953
2024-09-28 17:17:44 +02:00
60351b9df9
Introduce Various Correction histories
...
This patch introduces three additional correction histories, namely,
Major Piece Correction History, Minor Piece Correction History, and
Non-Pawn Correction History.
Introduced by @mcthouacbb in Sirius
(https://github.com/mcthouacbb/Sirius ) chess engine. The Major Piece
Correction History is indexed by side-to-move and the Zobrist key
representing the position of the King, Rook, and Queen of both sides.
Likewise, the Minor Piece Correction History is indexed by side-to-move
and the Zobrist key representing the position of the King, Knight, and
Bishop of both sides.
Also See:
https://github.com/mcthouacbb/Sirius/commit/97b85bbaac88ff5a0f63e28776027dd3de77164e
https://github.com/mcthouacbb/Sirius/commit/3099cdef2f13e29805654b5f8153e6ecd5853195
Introduced by @zzzzz151 in Starzix (https://github.com/zzzzz151/Starzix )
chess engine. Non-Pawn correction history consists of side-to-move, side
of Zobrist key, and a Zobrist key representing of the position of all
non-pawn pieces of **one side**. The non-pawn correction values for both
key sides are then summed.
Also See:
https://github.com/zzzzz151/Starzix/commit/34911772f178c27b3a239dda0acb79c397c3a2f0
https://github.com/zzzzz151/Starzix/commit/33e0df8dd2db1d4775974ab12e3390154697f47a
The weights on the final correction value of the above correction
histories, as well as existing correction histories, are then tuned in
two separate SPSA sessions, totaling 75k games.
SPSA1:
https://tests.stockfishchess.org/tests/view/66e5243886d5ee47d953a86b
(Stopped early due to some weights reaching the maximum value)
SPSA2:
https://tests.stockfishchess.org/tests/view/66e6a26f86d5ee47d953a965
Also thanks to @martinnovaak, (Motor
https://github.com/martinnovaak/motor author) for insights and
suggestions.
Passed STC:
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 23328 W: 6197 L: 5901 D: 11230
Ptnml(0-2): 82, 2582, 6041, 2876, 83
https://tests.stockfishchess.org/tests/view/66e8787b86d5ee47d953ab6f
Passed LTC:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 10626 W: 2826 L: 2560 D: 5240
Ptnml(0-2): 4, 1054, 2941, 1300, 14
https://tests.stockfishchess.org/tests/view/66e8ab2386d5ee47d953aba8
closes https://github.com/official-stockfish/Stockfish/pull/5598
Bench: 1011161
2024-09-17 21:01:43 +02:00
240a5b1c72
Introduce separate butterfly history table for sorting root moves
...
Idea of this patch comes from the fact that current history heuristics
are mostly populated by low depth entries since our stat bonus reaches
maximum value at depth 5-6 and number of low depth nodes is much bigger
than number of high depth nodes. But it doesn't make a whole lost of
sense to use this low-depth centered histories to sort moves at root.
Current patch introduces special history table that is used exclusively
at root, it remembers which quiet moves were good and which quiet moves
were not good there and uses this information for move ordering.
Passed STC:
https://tests.stockfishchess.org/tests/view/66dda74adc53972b68218cc9
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 127680 W: 33579 L: 33126 D: 60975
Ptnml(0-2): 422, 15098, 32391, 15463, 466
Passed LTC:
https://tests.stockfishchess.org/tests/view/66dead2adc53972b68218d34
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 381978 W: 96958 L: 95923 D: 189097
Ptnml(0-2): 277, 42165, 105089, 43162, 296
closes https://github.com/official-stockfish/Stockfish/pull/5595
Bench: 1611283
2024-09-17 20:54:02 +02:00
5ce7f866a5
Simplify Fail Low Bonus
...
Passed Non-regression STC:
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 302528 W: 78190 L: 78264 D: 146074
Ptnml(0-2): 1029, 35797, 77551, 35993, 894
https://tests.stockfishchess.org/tests/view/66dcebdedc53972b68218c7e
Passed Non-regression LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 122754 W: 31025 L: 30907 D: 60822
Ptnml(0-2): 74, 13597, 33908, 13733, 65
https://tests.stockfishchess.org/tests/view/66e0c38686d5ee47d953a481
closes https://github.com/official-stockfish/Stockfish/pull/5594
Bench: 1646373
2024-09-17 20:50:30 +02:00
224c147bd6
VVLTC Search Tune
...
Tuned with 115k games at VVLTC:
https://tests.stockfishchess.org/tests/view/66c80e09bf8c9d8780fda62a
Passed VVLTC 1st sprt:
https://tests.stockfishchess.org/tests/view/66d69ade9de3e7f9b33d14f9
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 54270 W: 13935 L: 13647 D: 26688
Ptnml(0-2): 2, 4907, 17032, 5189, 5
Passed VVLTC 2nd sprt:
https://tests.stockfishchess.org/tests/view/66dcf9c1dc53972b68218c84
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 136696 W: 34941 L: 34462 D: 67293
Ptnml(0-2): 8, 12659, 42535, 13138, 8
closes https://github.com/official-stockfish/Stockfish/pull/5592
Bench: 1644273
2024-09-17 20:47:24 +02:00
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
6de2587236
Remove statScore condition in NMP
...
Eliminate the condition that is nearly 100% likelihood of being true.
Passed non-regression STC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 208832 W: 54053 L: 54022 D: 100757
Ptnml(0-2): 753, 24987, 52901, 25026, 749
https://tests.stockfishchess.org/tests/view/66cddb50bf8c9d8780fdabaf
Passed non-regression LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 154344 W: 39132 L: 39047 D: 76165
Ptnml(0-2): 115, 17231, 42403, 17300, 123
https://tests.stockfishchess.org/tests/view/66cfafe39de3e7f9b33d1050
closes https://github.com/official-stockfish/Stockfish/pull/5558
Bench: 1393697
2024-09-10 22:58:47 +02:00
a8cb002038
Simplify ttmove reduction
...
Remove condition that clamps reductions for tt move.
Passed STC:
https://tests.stockfishchess.org/tests/view/66d5f1239de3e7f9b33d14b0
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 91136 W: 23805 L: 23646 D: 43685
Ptnml(0-2): 334, 10328, 24066, 10525, 315
Passed LTC:
https://tests.stockfishchess.org/tests/view/66d7c5889de3e7f9b33d1721
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 139242 W: 35130 L: 35030 D: 69082
Ptnml(0-2): 78, 15200, 38986, 15258, 99
closes https://github.com/official-stockfish/Stockfish/pull/5574
Bench: 1268715
2024-09-09 18:02:32 +02:00
e74452ae44
Reduce on ttcaptures if not capture
...
Tweak ttcapture reduction.
Reduce on ttcaptures only if the current move is a capture
Passed STC:
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 94912 W: 24896 L: 24492 D: 45524
Ptnml(0-2): 301, 11197, 24087, 11539, 332
https://tests.stockfishchess.org/tests/view/66cd2264bf8c9d8780fdab34
Passed LTC:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 60738 W: 15465 L: 15096 D: 30177
Ptnml(0-2): 42, 6573, 16775, 6932, 47
https://tests.stockfishchess.org/tests/view/66cf356d9de3e7f9b33d0fde
closes https://github.com/official-stockfish/Stockfish/pull/5562
Bench: 1268700
2024-09-09 17:48:26 +02:00
Shawn Xu