bmc4 and Joost VandeVondele
4d6a11a04c
Don't change ttPv at probCut
...
STC:
LLR: 2.96 (-2.94,2.94) <-2.25,0.25>
Total: 35672 W: 9618 L: 9462 D: 16592
Ptnml(0-2): 151, 3890, 9601, 4040, 154
https://tests.stockfishchess.org/tests/view/62ab03f750949cfc241b1965
LTC:
LLR: 2.93 (-2.94,2.94) <-2.25,0.25>
Total: 54160 W: 14626 L: 14511 D: 25023
Ptnml(0-2): 42, 5414, 16056, 5523, 45
https://tests.stockfishchess.org/tests/view/62ab5e6fd89eb6cf1e071b87
closes https://github.com/official-stockfish/Stockfish/pull/4088
bench: 5798229
2022-06-20 08:24:07 +02:00
bmc4 and Joost VandeVondele
6edc29d720
Simplify away condition in ttSave in probCut
...
Remove condition for tte->save in probCut so it always saves on probCut cutoff.
STC:
LLR: 2.95 (-2.94,2.94) <-2.25,0.25>
Total: 47848 W: 12921 L: 12782 D: 22145
Ptnml(0-2): 207, 5340, 12715, 5431, 231
https://tests.stockfishchess.org/tests/view/62a1f7c87bd8e641e44436f7
LTC:
LLR: 2.97 (-2.94,2.94) <-2.25,0.25>
Total: 132736 W: 35895 L: 35881 D: 60960
Ptnml(0-2): 109, 13384, 39360, 13414, 101
https://tests.stockfishchess.org/tests/view/62a2421a7bd8e641e444434f
closes https://github.com/official-stockfish/Stockfish/pull/4069
bench: 5845802
2022-06-16 07:12:01 +02:00
bmc4 and Joost VandeVondele
93b14a17d1
Don't direct prune a move if it's a retake
...
STC:
LLR: 2.94 (-2.94,2.94) <0.00,2.50>
Total: 36304 W: 9499 L: 9226 D: 17579
Ptnml(0-2): 96, 4102, 9508, 4325, 121
https://tests.stockfishchess.org/tests/view/61c7069ae68b2a714b6dca27
LTC:
LLR: 2.95 (-2.94,2.94) <0.50,3.00>
Total: 93824 W: 24478 L: 24068 D: 45278
Ptnml(0-2): 70, 9644, 27082, 10038, 78
https://tests.stockfishchess.org/tests/view/61c725fee68b2a714b6dcfa2
closes https://github.com/official-stockfish/Stockfish/pull/3871
Bench: 4106806
2021-12-27 16:43:44 +01:00
bmc4 and Joost VandeVondele
88f17a814d
Update Elo estimates for terms in search
...
This updates estimates from 2yr ago #2401 , and adds missing terms.
All tests run at 10+0.1 (STC), 20000 games, error bars +- 1.8 Elo, book 8moves_v3.png.
A table of Elo values with the links to the corresponding tests can be found at the PR
closes https://github.com/official-stockfish/Stockfish/pull/3868
Non-functional Change
2021-12-21 13:47:57 +01:00
bmc4 and Joost VandeVondele
22e92d23d2
Remove Capture history pruning
...
Fixed number of games. (book: 8moves_v3.png):
ELO: -0.69 +-1.8 (95%) LOS: 22.1%
Total: 20000 W: 1592 L: 1632 D: 16776
Ptnml(0-2): 44, 1194, 7566, 1150, 46
https://tests.stockfishchess.org/tests/view/61bb8eb657a0d0f327c30ce8
STC:
LLR: 2.94 (-2.94,2.94) <-2.25,0.25>
Total: 139976 W: 36039 L: 36036 D: 67901
Ptnml(0-2): 435, 16138, 36885, 16049, 481
https://tests.stockfishchess.org/tests/view/61be731857a0d0f327c39ea2
LTC:
LLR: 2.95 (-2.94,2.94) <-2.25,0.25>
Total: 70656 W: 18284 L: 18189 D: 34183
Ptnml(0-2): 34, 7317, 20529, 7416, 32
https://tests.stockfishchess.org/tests/view/61bf39b657a0d0f327c3c37b
closes https://github.com/official-stockfish/Stockfish/pull/3867
bench: 4281737
2021-12-21 13:42:33 +01:00
bmc4 and Joost VandeVondele
2c30956a13
Remove Capture Extension
...
This revert the patch #3692 , probably can be simplified after the introduction of #3838 .
Fixed-game test:
ELO: -1.41 +-1.8 (95%) LOS: 5.9%
Total: 20000 W: 1552 L: 1633 D: 16815
Ptnml(0-2): 38, 1242, 7517, 1169, 34
https://tests.stockfishchess.org/tests/view/61bc1a2057a0d0f327c32a3c
STC:
LLR: 2.94 (-2.94,2.94) <-2.25,0.25>
Total: 44528 W: 11619 L: 11478 D: 21431
Ptnml(0-2): 146, 5020, 11771, 5201, 126
https://tests.stockfishchess.org/tests/view/61bc638c57a0d0f327c338fe
LTC:
LLR: 2.94 (-2.94,2.94) <-2.25,0.25>
Total: 34136 W: 8847 L: 8704 D: 16585
Ptnml(0-2): 23, 3475, 9925, 3626, 19
https://tests.stockfishchess.org/tests/view/61bcb24257a0d0f327c34813
closes https://github.com/official-stockfish/Stockfish/pull/3863
Bench: 4054695
2021-12-21 13:40:57 +01:00
bmc4 and Stéphane Nicolet
0889210262
Simplify away singularQuietLMR
...
While at it, we also update the Elo estimate of reduction at non-PV nodes
(source: https://tests.stockfishchess.org/tests/view/61acf97156fcf33bce7d6303 )
STC:
LLR: 2.94 (-2.94,2.94) <-2.25,0.25>
Total: 243632 W: 62874 L: 63022 D: 117736
Ptnml(0-2): 810, 28024, 64249, 27970, 763
https://tests.stockfishchess.org/tests/view/61b8b1b7dffbe89a35814c0d
LTC:
LLR: 2.93 (-2.94,2.94) <-2.25,0.25>
Total: 91392 W: 23520 L: 23453 D: 44419
Ptnml(0-2): 51, 9568, 26387, 9643, 47
https://tests.stockfishchess.org/tests/view/61b97316dffbe89a35817da7
closes https://github.com/official-stockfish/Stockfish/pull/3854
bench: 4217785
2021-12-17 18:22:48 +01:00
bmc4 and Stéphane Nicolet
a6a9d828ab
Simplifies bestMoveChanges from LMR
...
As bestMoveChanges is only reset on mainThread and it could change how other
threads search, a multi-threads test was made.
STC:
LLR: 2.94 (-2.94,2.94) <-2.25,0.25>
Total: 146776 W: 37934 L: 37941 D: 70901
Ptnml(0-2): 477, 15644, 41173, 15597, 497
https://tests.stockfishchess.org/tests/view/61a8f9f34ed77d629d4ea2d6
LTC:
LLR: 3.11 (-2.94,2.94) <-2.25,0.25>
Total: 114040 W: 29314 L: 29269 D: 55457
Ptnml(0-2): 50, 10584, 35722, 10599, 65
https://tests.stockfishchess.org/tests/view/61a9d4bf9e8855bba1a35c4f
(SMP, 8 threads) STC:
LLR: 2.95 (-2.94,2.94) <-2.25,0.25>
Total: 23888 W: 6308 L: 6143 D: 11437
Ptnml(0-2): 36, 2557, 6600, 2708, 43
https://tests.stockfishchess.org/tests/view/61ac27a756fcf33bce7d3677
closes https://github.com/official-stockfish/Stockfish/pull/3831
bench: 4829419
2021-12-05 17:50:04 +01:00
bmc4 and Joost VandeVondele
c1f9a359e8
Correctly reset bestMoveChanges
...
for searches not using time management (e.g. analysis, fixed node game play etc),
bestMoveChanges was not reset during search iterations. As LMR uses this quantity,
search was somewhat weaker.
Tested using fixed node playing games:
```
./c-chess-cli -each nodes=10000 option.Hash=16 -engine cmd=../Stockfish/src/fix -engine cmd=../Stockfish/src/master -concurrency 6 -openings file=../books/UHO_XXL_+0.90_+1.19.epd -games 10000
Score of Stockfish Fix vs Stockfish Master: 3187 - 3028 - 3785 [0.508] 10000
./c-chess-cli -each nodes=30000 option.Hash=16 -engine cmd=../Stockfish/src/fix -engine cmd=../Stockfish/src/master -concurrency 6 -openings file=../books/UHO_XXL_+0.90_+1.19.epd -games 10000
Score of Stockfish Fix vs Stockfish Master: 2946 - 2834 - 4220 [0.506] 10000
```
closes https://github.com/official-stockfish/Stockfish/pull/3818
bench: 5061979
2021-12-01 18:22:44 +01:00
bmc4 and Joost VandeVondele
95a2ac1e07
Simplify reduction on rootNode when bestMoveChanges is high
...
The reduction introduced in #3736 also consider on rootNode, so we don't have to reduce again.
STC:
LLR: 2.94 (-2.94,2.94) <-2.25,0.25>
Total: 28736 W: 7494 L: 7329 D: 13913
Ptnml(0-2): 95, 3247, 7503, 3444, 79
https://tests.stockfishchess.org/tests/view/61a3abe01b7fdf52228e74d8
LTC:
LLR: 2.94 (-2.94,2.94) <-2.25,0.25>
Total: 47816 W: 12434 L: 12308 D: 23074
Ptnml(0-2): 37, 4972, 13755, 5116, 28
https://tests.stockfishchess.org/tests/view/61a3c3e39f0c43dae1c71d71
closes https://github.com/official-stockfish/Stockfish/pull/3817
bench: 6331638
2021-12-01 18:10:51 +01:00
bmc4 and Stéphane Nicolet
c4a1390f4e
Simplify away the Reverse Move penalty
...
This simplifies the penalty for reverse move introduced in
https://github.com/official-stockfish/Stockfish/pull/2294 .
STC:
LLR: 2.94 (-2.94,2.94) <-2.25,0.25>
Total: 81696 W: 20627 L: 20540 D: 40529
Ptnml(0-2): 221, 9390, 21559, 9437, 241
https://tests.stockfishchess.org/tests/view/618810acd7a085ad008ef1cc
LTC:
LLR: 2.95 (-2.94,2.94) <-2.25,0.25>
Total: 44136 W: 11021 L: 10890 D: 22225
Ptnml(0-2): 28, 4570, 12746, 4691, 33
https://tests.stockfishchess.org/tests/view/61885686d7a085ad008ef20b
closes https://github.com/official-stockfish/Stockfish/pull/3781
bench: 6547978
2021-11-08 13:14:18 +01:00
bmc4 and Stéphane Nicolet
1163d972a9
Simplify LMR multiThread condition
...
STC (8 threads):
LLR: 2.95 (-2.94,2.94) <-2.50,0.50>
Total: 110584 W: 27818 L: 27807 D: 54959
Ptnml(0-2): 156, 12089, 30791, 12100, 156
https://tests.stockfishchess.org/tests/view/6172ef436ce927be325583a9
LTC (8 threads):
LLR: 2.94 (-2.94,2.94) <-2.50,0.50>
Total: 23632 W: 6025 L: 5903 D: 11704
Ptnml(0-2): 5, 2292, 7100, 2414, 5
https://tests.stockfishchess.org/tests/view/6173cf096ce927be32558412
closes https://github.com/official-stockfish/Stockfish/pull/3757
No functional change (in the single-threaded case)
Bench: 6689428
2021-10-24 22:08:28 +02:00
bmc4 and Joost VandeVondele
927a84d310
Increase TTdepth acceptance some Threads
...
Increase TTdepth acceptance only on half of the Threads
STC:
LLR: 2.96 (-2.94,2.94) <-0.50,2.50>
Total: 19272 W: 4956 L: 4766 D: 9550
Ptnml(0-2): 25, 1989, 5423, 2169, 30
https://tests.stockfishchess.org/tests/view/6172be6238cb9784038af9a7
LTC:
LLR: 2.93 (-2.94,2.94) <0.50,3.50>
Total: 23688 W: 6111 L: 5897 D: 11680
Ptnml(0-2): 2, 2275, 7081, 2479, 7
https://tests.stockfishchess.org/tests/view/6172e32938cb9784038af9c7
closes https://github.com/official-stockfish/Stockfish/pull/3754
No functional change in the single-threaded case
2021-10-23 12:23:29 +02:00
bmc4 and Stéphane Nicolet
42a895d9c9
Simplify null move search condition
...
Remove `ss->ttPv` condition on null move search condition
STC:
LLR: 2.94 (-2.94,2.94) <-2.50,0.50>
Total: 80832 W: 20276 L: 20221 D: 40335
Ptnml(0-2): 267, 9335, 21168, 9368, 278
https://tests.stockfishchess.org/tests/view/616ed4a0942d40685e3237c6
LTC:
LLR: 2.95 (-2.94,2.94) <-2.50,0.50>
Total: 54184 W: 13464 L: 13377 D: 27343
Ptnml(0-2): 37, 5758, 15435, 5805, 57
https://tests.stockfishchess.org/tests/view/616ef71f40f619782fd4f72d
closes https://github.com/official-stockfish/Stockfish/pull/3750
bench: 6201607
2021-10-21 08:43:43 +02:00
bmc4 and Joost VandeVondele
4af1ae82c6
Adjust TTdepth acceptance on early cutoff
...
STC:
LLR: 2.94 (-2.94,2.94) <-0.50,2.50>
Total: 63784 W: 16185 L: 15917 D: 31682
Ptnml(0-2): 231, 7309, 16531, 7603, 218
https://tests.stockfishchess.org/tests/view/616ed03a942d40685e3237c0
LTC:
LLR: 2.93 (-2.94,2.94) <0.50,3.50>
Total: 12728 W: 3268 L: 3072 D: 6388
Ptnml(0-2): 8, 1298, 3563, 1480, 15
https://tests.stockfishchess.org/tests/view/616ef156942d40685e32380a
closes https://github.com/official-stockfish/Stockfish/pull/3748
bench: 7050445
2021-10-19 22:14:39 +02:00
bmc4 and Joost VandeVondele
b37054c310
Simplify evaluate condition on search
...
Remove condition for MOVE_NULL on search.
STC:
LLR: 2.94 (-2.94,2.94) <-2.50,0.50>
Total: 47544 W: 11968 L: 11864 D: 23712
Ptnml(0-2): 150, 5535, 12318, 5599, 170
https://tests.stockfishchess.org/tests/view/616e37143799eb91f1f071ee
LTC:
LLR: 2.93 (-2.94,2.94) <-2.50,0.50>
Total: 67472 W: 16938 L: 16870 D: 33664
Ptnml(0-2): 49, 7119, 19331, 7189, 48
https://tests.stockfishchess.org/tests/view/616e3fab3799eb91f1f071f1
closes https://github.com/official-stockfish/Stockfish/pull/3746
bench: 5255771
2021-10-19 22:09:47 +02:00
bmc4 and Stéphane Nicolet
67d0616483
Simplify probCutCount away
...
Simplify away the limitation in number of moves in probCut.
STC:
LLR: 2.96 (-2.94,2.94) <-2.50,0.50>
Total: 286768 W: 71888 L: 72133 D: 142747
Ptnml(0-2): 983, 33084, 75471, 32887, 959
https://tests.stockfishchess.org/tests/view/616c9b9b90e1312a3cd0ef0a
LTC:
LLR: 2.95 (-2.94,2.94) <-2.50,0.50>
Total: 69312 W: 17243 L: 17176 D: 34893
Ptnml(0-2): 42, 7452, 19614, 7493, 55
https://tests.stockfishchess.org/tests/view/616cebbf4f95b438f7a85f93
closes https://github.com/official-stockfish/Stockfish/pull/3745
bench: 5005810
2021-10-18 21:00:08 +02:00
bmc4 and Stéphane Nicolet
0bddd942b4
Simplify ttHitAverage away
...
Simplify ttHitAverage away, which was introduced in the following commit:
[here](https://github.com/BM123499/Stockfish/commit/fe124896b241b4791454fd151da10101ad48f6d7 )
A few tweaks with Elo gaining bounds have been tried to keep the code,
but they all failed:
https://tests.stockfishchess.org/tests/view/61656f7683dd501a05b0b292
https://tests.stockfishchess.org/tests/view/6165c0ca83dd501a05b0b2ca
https://tests.stockfishchess.org/tests/view/6165bf9683dd501a05b0b2c8
https://tests.stockfishchess.org/tests/view/6165719483dd501a05b0b29b
https://tests.stockfishchess.org/tests/view/6166c7fd83dd501a05b0b353
https://tests.stockfishchess.org/tests/view/6166c63b83dd501a05b0b350
STC:
LLR: 2.94 (-2.94,2.94) <-2.50,0.50>
Total: 58504 W: 14781 L: 14694 D: 29029
Ptnml(0-2): 175, 6718, 15426, 6711, 222
https://tests.stockfishchess.org/tests/view/6165112c83dd501a05b0b257
LTC:
LLR: 2.96 (-2.94,2.94) <-2.50,0.50>
Total: 33480 W: 8448 L: 8332 D: 16700
Ptnml(0-2): 21, 3569, 9447, 3679, 24
https://tests.stockfishchess.org/tests/view/61656fcf83dd501a05b0b294
change https://github.com/official-stockfish/Stockfish/pull/3739
bench: 4540339
2021-10-14 09:47:20 +02:00
bmc4 and Joost VandeVondele
d754ea50a8
Simplify Declaration on Pawn Move Generation
...
Removes possible micro-optimization in favor of readability.
STC:
LLR: 2.95 (-2.94,2.94) <-2.50,0.50>
Total: 75432 W: 5824 L: 5777 D: 63831
Ptnml(0-2): 178, 4648, 28036, 4657, 197
https://tests.stockfishchess.org/tests/view/611fa7f84977aa1525c9cb75
LTC:
LLR: 2.93 (-2.94,2.94) <-2.50,0.50>
Total: 41200 W: 1156 L: 1106 D: 38938
Ptnml(0-2): 13, 981, 18562, 1031, 13
https://tests.stockfishchess.org/tests/view/611fcc694977aa1525c9cb9b
Closes https://github.com/official-stockfish/Stockfish/pull/3669
No functional change
2021-08-22 09:15:19 +02:00
bmc4 and Joost VandeVondele
e57d2d9d47
Simplify Null Move Search Reduction
...
slightly simpler formula for reduction computation.
first round of tests:
STC:
LLR: 2.97 (-2.94,2.94) <-2.50,0.50>
Total: 15632 W: 1319 L: 1204 D: 13109
Ptnml(0-2): 33, 956, 5733, 1051, 43
https://tests.stockfishchess.org/tests/view/60bd03c7457376eb8bcaa600
LTC:
LLR: 3.37 (-2.94,2.94) <-2.50,0.50>
Total: 86296 W: 2814 L: 2779 D: 80703
Ptnml(0-2): 33, 2500, 38039, 2551, 25
https://tests.stockfishchess.org/tests/view/60bd1ff0457376eb8bcaa653
recent tests:
STC:
LLR: 2.93 (-2.94,2.94) <-2.50,0.50>
Total: 23936 W: 1895 L: 1793 D: 20248
Ptnml(0-2): 40, 1470, 8869, 1526, 63
https://tests.stockfishchess.org/tests/view/611f9b7d4977aa1525c9cb6b
LTC:
LLR: 2.95 (-2.94,2.94) <-2.50,0.50>
Total: 62568 W: 1750 L: 1713 D: 59105
Ptnml(0-2): 19, 1560, 28085, 1605, 15
https://tests.stockfishchess.org/tests/view/611fa4814977aa1525c9cb71
functional on high depth
closes https://github.com/official-stockfish/Stockfish/pull/3535
Bench: 5375286
2021-08-22 09:00:15 +02:00
bmc4 and Joost VandeVondele
e47b74457e
Simplify Reductions Initialization
...
passed
STC:
LLR: 2.94 (-2.94,2.94) <-2.50,0.50>
Total: 45032 W: 3600 L: 3518 D: 37914
Ptnml(0-2): 111, 2893, 16435, 2957, 120
https://tests.stockfishchess.org/tests/view/60d2655d40925195e7a6c527
LTC:
LLR: 3.00 (-2.94,2.94) <-2.50,0.50>
Total: 25728 W: 786 L: 722 D: 24220
Ptnml(0-2): 5, 650, 11494, 706, 9
https://tests.stockfishchess.org/tests/view/60d2b14240925195e7a6c577
closes https://github.com/official-stockfish/Stockfish/pull/3584
bench: 4602977
2021-06-28 21:12:04 +02:00
bmc4 and Stéphane Nicolet
55e69dc88d
Simplify reduction when best move doesn't change frequently.
...
STC:
LLR: 2.94 (-2.94,2.94) <-2.50,0.50>
Total: 40400 W: 3468 L: 3377 D: 33555
Ptnml(0-2): 134, 2734, 14388, 2795, 149
https://tests.stockfishchess.org/tests/view/60c93e5a457376eb8bcab15f
LTC:
LLR: 2.94 (-2.94,2.94) <-2.50,0.50>
Total: 34200 W: 1190 L: 1128 D: 31882
Ptnml(0-2): 22, 998, 15001, 1054, 25
https://tests.stockfishchess.org/tests/view/60c96a1a457376eb8bcab180
closes https://github.com/official-stockfish/Stockfish/pull/3559
bench: 5629669
2021-06-17 02:08:33 +02:00
bmc4 and Stéphane Nicolet
785b708097
Simplify promotion move generator
...
This patch removes Knight promotion checks from Captures. As a consequence,
it also removes this underpromotion from qsearch.
STC:
LLR: 2.93 (-2.94,2.94) <-2.50,0.50>
Total: 37776 W: 3113 L: 3023 D: 31640
Ptnml(0-2): 103, 2419, 13755, 2507, 104
https://tests.stockfishchess.org/tests/view/60be6a06457376eb8bcaa775
LTC:
LLR: 2.93 (-2.94,2.94) <-2.50,0.50>
Total: 39760 W: 1257 L: 1203 D: 37300
Ptnml(0-2): 11, 1079, 17646, 1133, 11
https://tests.stockfishchess.org/tests/view/60beb972457376eb8bcaa7c5
closes https://github.com/official-stockfish/Stockfish/pull/3536
Bench: 5530620
2021-06-08 20:16:20 +02:00
bmc4 and Joost VandeVondele
999e142c54
Reduce in LMR reduction on PvNode
...
reduce reduction in LMR by 1 on PvNode.
STC:
LLR: 2.93 (-2.94,2.94) <-0.50,2.50>
Total: 266080 W: 22438 L: 21996 D: 221646
Ptnml(0-2): 774, 17874, 95376, 18168, 848
https://tests.stockfishchess.org/tests/view/60bc0661457376eb8bcaa4bb
LTC:
LLR: 2.93 (-2.94,2.94) <0.50,3.50>
Total: 20144 W: 698 L: 587 D: 18859
Ptnml(0-2): 2, 529, 8906, 626, 9
https://tests.stockfishchess.org/tests/view/60bcc3f2457376eb8bcaa58d
closes https://github.com/official-stockfish/Stockfish/pull/3534
bench: 5173012
2021-06-06 21:22:39 +02:00
bmc4 and Stéphane Nicolet
0b7cc8bd2f
Introducing NodeType Root
...
We transform rootNode into constexpr by adding a new NodeType `Root`,
which causes a speed up.
Local test:
```
Build Tester: 1.4.7.0
Windows 10 (Version 10.0, Build 0, 64-bit Edition)
Intel(R) Core(TM) i7-8750H CPU @ 2.20GHz
SafeMode: No
Running In VM: No
HyperThreading Enabled: Yes
CPU Warmup: Yes
Command Line: bench
Tests per Build: 25
ANOVA: n/a
Engine# (NPS) Speedup Sp Conf. 95% S.S.
patch (920.179,4) ---> master (906.329,2) ---> 1,528% 20.336,5 Yes No
```
---------
STC:
LLR: 2.94 (-2.94,2.94) <-0.50,2.50>
Total: 98216 W: 8348 L: 8102 D: 81766
Ptnml(0-2): 295, 6357, 35549, 6621, 286
https://tests.stockfishchess.org/tests/view/60b797e2457376eb8bcaa0ab
Yellow LTC:
LLR: -2.95 (-2.94,2.94) <0.50,3.50>
Total: 76936 W: 2651 L: 2626 D: 71659
Ptnml(0-2): 29, 2233, 33916, 2264, 26
https://tests.stockfishchess.org/tests/view/60b80d6d457376eb8bcaa145
closes https://github.com/official-stockfish/Stockfish/pull/3522
No functional change
2021-06-04 01:23:49 +02:00
bmc4 and Joost VandeVondele
e044068b43
Increased reduction for captures in LMR
...
It now does, in LMR, an increased on reduction by 1 for captures in cut nodes.
STC:
LLR: 2.93 (-2.94,2.94) <-0.50,2.50>
Total: 30656 W: 2565 L: 2397 D: 25694
Ptnml(0-2): 63, 2012, 11029, 2142, 82
https://tests.stockfishchess.org/tests/view/60a96733ce8ea25a3ef04178
LTC:
LLR: 2.93 (-2.94,2.94) <0.50,3.50>
Total: 124840 W: 4139 L: 3878 D: 116823
Ptnml(0-2): 48, 3480, 55100, 3747, 45
https://tests.stockfishchess.org/tests/view/60a995f5ce8ea25a3ef041b7
closes https://github.com/official-stockfish/Stockfish/pull/3494
bench: 3864295
2021-05-24 15:52:22 +02:00
bmc4 and Stéphane Nicolet
ff4c22238a
Tuning Search
...
This patch tunes constant in search.cpp
STC:
LLR: 2.94 (-2.94,2.94) <-0.50,2.50>
Total: 30648 W: 2580 L: 2410 D: 25658
Ptnml(0-2): 80, 1969, 11093, 2065, 117
https://tests.stockfishchess.org/tests/view/60a71d3cce8ea25a3ef03fae
LTC:
LLR: 2.95 (-2.94,2.94) <0.50,3.50>
Total: 52896 W: 1776 L: 1617 D: 49503
Ptnml(0-2): 13, 1462, 23347, 1605, 21
https://tests.stockfishchess.org/tests/view/60a794ddce8ea25a3ef0400a
closes https://github.com/official-stockfish/Stockfish/pull/3491
Bench: 4004731
2021-05-22 19:23:15 +02:00
bmc4 and Stéphane Nicolet
49c79aa15c
Simplify reduction for consecutive fails
...
Revert the heuristic introduced in #3184 , by which we reduced more
the late sons of the root position after consecutive fail highs.
---
Before new net architecture:
STC:
LLR: 2.95 (-2.94,2.94) <-2.50,0.50>
Total: 226336 W: 20373 L: 20500 D: 185463
Ptnml(0-2): 755, 16087, 79595, 15992, 739
https://tests.stockfishchess.org/tests/view/609dec205085663412d08e9d
LTC:
LLR: 2.93 (-2.94,2.94) <-2.50,0.50>
Total: 67432 W: 2411 L: 2375 D: 62646
Ptnml(0-2): 33, 1944, 29714, 2004, 21
https://tests.stockfishchess.org/tests/view/609ee30f5085663412d08fc3
---
After new net architecture:
STC:
LLR: 2.95 (-2.94,2.94) <-2.50,0.50>
Total: 141752 W: 11591 L: 11617 D: 118544
Ptnml(0-2): 387, 9231, 51674, 9189, 395
https://tests.stockfishchess.org/tests/view/60a4320ace8ea25a3ef03cfd
LTC:
LLR: 2.95 (-2.94,2.94) <-2.50,0.50>
Total: 294072 W: 9825 L: 9950 D: 274297
Ptnml(0-2): 121, 8610, 129681, 8521, 103
https://tests.stockfishchess.org/tests/view/60a51b5ece8ea25a3ef03dcd
---
closes https://github.com/official-stockfish/Stockfish/pull/3490
Bench: 3752892
2021-05-22 19:02:36 +02:00
bmc4 and Stéphane Nicolet
c82f6f56a6
Simplify LMR rules for statScore
...
We simplify two parts of LMR which seem not to bring strength anymore.
---
Individual Tests:
https://tests.stockfishchess.org/tests/view/609d1cc15085663412d0856a
https://tests.stockfishchess.org/tests/view/609cb0cc7746e3dc74ffae8d
https://tests.stockfishchess.org/tests/view/609d1c9f5085663412d08568
---
LTC:
LLR: 2.97 (-2.94,2.94) <-2.50,0.50>
Total: 84184 W: 3093 L: 3066 D: 78025
Ptnml(0-2): 47, 2755, 36458, 2788, 44
https://tests.stockfishchess.org/tests/view/609d84615085663412d08e2f
---
While at it, we also update the Elo estimate of the previous rule in LMR, see:
https://tests.stockfishchess.org/tests/view/609a933c3a33eb67a844f7ca
https://tests.stockfishchess.org/tests/view/609a959c3a33eb67a844f7d5
https://tests.stockfishchess.org/tests/view/609afff73a33eb67a844f870
---
closes https://github.com/official-stockfish/Stockfish/pull/3464
Bench: 4156523
2021-05-15 10:16:01 +02:00
bmc4 and Stéphane Nicolet
24b8b3098b
Remove early return in Probcut code
...
We simplify away early return in ProbCut, as it seems not to bring any strength anymore.
STC:
LLR: 2.93 (-2.94,2.94) <-2.50,0.50>
Total: 42632 W: 3705 L: 3617 D: 35310
Ptnml(0-2): 123, 2947, 15110, 2991, 145
https://tests.stockfishchess.org/tests/view/609c49da7746e3dc74ffae02
LTC:
LLR: 2.96 (-2.94,2.94) <-2.50,0.50>
Total: 35384 W: 1314 L: 1251 D: 32819
Ptnml(0-2): 11, 1130, 15355, 1177, 19
https://tests.stockfishchess.org/tests/view/609c71467746e3dc74ffae47
---
While at it, we also update the Elo estimate of ProbCut
(see https://tests.stockfishchess.org/tests/view/609bfb597746e3dc74ffabe3 ).
closes https://github.com/official-stockfish/Stockfish/pull/3462
bench: 3764662
2021-05-15 10:07:40 +02:00
bmc4 and Stéphane Nicolet
594e2ac999
Simplify LMR rule for non-checking captures
...
We simplify away the complicated rule in LMR for "non-checking captures
likely to be bad", as it seems not to bring any strength anymore.
STC:
LLR: 2.94 (-2.94,2.94) <-2.50,0.50>
Total: 55256 W: 4972 L: 4897 D: 45387
Ptnml(0-2): 177, 3976, 19234, 4077, 164
https://tests.stockfishchess.org/tests/view/609adf3b3a33eb67a844f842
LTC:
LLR: 2.95 (-2.94,2.94) <-2.50,0.50>
Total: 10344 W: 437 L: 353 D: 9554
Ptnml(0-2): 1, 322, 4449, 392, 8
https://tests.stockfishchess.org/tests/view/609b3dfa3a33eb67a844f88e
--
While at it, we also update the Elo estimate of the previous rule in LMR
(see https://tests.stockfishchess.org/tests/view/609af2a63a33eb67a844f867 ).
closes https://github.com/official-stockfish/Stockfish/pull/3460
Bench: 3840688
2021-05-12 17:13:52 +02:00
bmc4 and Joost VandeVondele
a0e2debe3f
Remove coordination between searching threads
...
In summary, this revert #2204 , as it seems not to bring any strength anymore, so it's no long needed.
STC (5+0.05 @ 8 threads):
LLR: 2.96 (-2.94,2.94) <-2.50,0.50>
Total: 105728 W: 6406 L: 6393 D: 92929
Ptnml(0-2): 154, 5479, 41599, 5464, 168
https://tests.stockfishchess.org/tests/view/6096994095e7f1852abd3154
LTC (20+0.2 @ 8 threads):
LLR: 2.96 (-2.94,2.94) <-2.50,0.50>
Total: 26336 W: 774 L: 712 D: 24850
Ptnml(0-2): 9, 641, 11810, 695, 13
https://tests.stockfishchess.org/tests/view/6097c62995e7f1852abd31e8
closes https://github.com/official-stockfish/Stockfish/pull/3459
No functional change.
2021-05-11 19:41:44 +02:00
bmc4 and Joost VandeVondele
602687801b
Simplify LMR
...
as it seems not to bring any strength and thus is no longer needed.
Tests for updating elo estimates:
https://tests.stockfishchess.org/tests/view/6099ff123a33eb67a844f789
https://tests.stockfishchess.org/tests/view/60953e6695e7f1852abd305b
Individual simplification tests:
https://tests.stockfishchess.org/tests/view/6098cfc73a33eb67a844f6a1
https://tests.stockfishchess.org/tests/view/6095539495e7f1852abd308b
LTC:
LLR: 2.93 (-2.94,2.94) <-2.50,0.50>
Total: 96984 W: 3624 L: 3608 D: 89752
Ptnml(0-2): 45, 3222, 41939, 3244, 42
https://tests.stockfishchess.org/tests/view/6099921a3a33eb67a844f74f
closes https://github.com/official-stockfish/Stockfish/pull/3458
bench: 3836428
2021-05-11 19:37:39 +02:00
bmc4 and Stéphane Nicolet
84b42b3ab3
Simplify pawn moves generator
...
This patch simplifies QUIET_CHECKS pawn move generator by merging discovery check
move generator with direct check move generator. It also simplifies emptySquares
instantiation. In addition, I added a comment in generate_moves() to clarify Check
branches.
STC:
LLR: 2.95 (-2.94,2.94) <-2.50,0.50>
Total: 112648 W: 9952 L: 9945 D: 92751
Ptnml(0-2): 369, 7682, 40195, 7729, 349
https://tests.stockfishchess.org/tests/view/6088226895e7f1852abd2978
LTC:
LLR: 2.93 (-2.94,2.94) <-2.50,0.50>
Total: 74656 W: 2797 L: 2765 D: 69094
Ptnml(0-2): 38, 2328, 32554, 2380, 28
https://tests.stockfishchess.org/tests/view/60884e5095e7f1852abd2994
closes https://github.com/official-stockfish/Stockfish/pull/3447
No functional change
2021-04-28 13:38:28 +02:00
bmc4 and Joost VandeVondele
32d781769d
Merge all move generators
...
Merging `generate<EVASIONS>` and `generate<QUIET_CHECKS>` into `generate_all()`.
verified to yield correct perft results, even though bench changes due to different order of generated moves.
No regresion playing games:
passed STC:
LLR: 2.94 (-2.94,2.94) {-1.00,0.20}
Total: 161800 W: 14585 L: 14624 D: 132591
Ptnml(0-2): 577, 11681, 56451, 11586, 605
https://tests.stockfishchess.org/tests/view/606532732b2df919fd5f026d
passed LTC:
LLR: 2.98 (-2.94,2.94) {-0.70,0.20}
Total: 188504 W: 6906 L: 6961 D: 174637
Ptnml(0-2): 87, 6272, 81610, 6175, 108
https://tests.stockfishchess.org/tests/view/6065b0772b2df919fd5f02ae
closes https://github.com/official-stockfish/Stockfish/pull/3418
Bench: 4536129
2021-04-24 12:55:33 +02:00
bmc4 and Stéphane Nicolet
79bb28281c
Merge all move generators
...
Merging `generate<EVASIONS>` and `generate<QUIET_CHECKS>` into `generate_all()`.
STC:
LLR: 2.94 (-2.94,2.94) {-1.00,0.20}
Total: 161800 W: 14585 L: 14624 D: 132591
Ptnml(0-2): 577, 11681, 56451, 11586, 605
https://tests.stockfishchess.org/tests/view/606532732b2df919fd5f026d
LTC:
LLR: 2.98 (-2.94,2.94) {-0.70,0.20}
Total: 188504 W: 6906 L: 6961 D: 174637
Ptnml(0-2): 87, 6272, 81610, 6175, 108
https://tests.stockfishchess.org/tests/view/6065b0772b2df919fd5f02ae
------------
Verified for correctness of `EVASIONS` by running perft:
```
./stockfish b3nch 16 1 6 default perft (replace 3 by e in b3nch)
Nodes searched : 71608931810
```
Also tested for correctness on Chess960 with a similar code shown here:
https://github.com/official-stockfish/Stockfish/pull/3418#issuecomment-816630295
```
./stockfish b3nch 16 1 6 fischer.txt perft
Nodes searched : 506736009395
```
------------
Closes https://github.com/official-stockfish/Stockfish/pull/3418
No functional change
2021-04-15 10:53:51 +02:00
bmc4 and Stéphane Nicolet
c489df6f5b
Simplify King Evasion
...
Simplify away the removal of some illegal `KING`-evasion moves during move
generation. Verified for correctness by running perft on the following positions:
```
./stockfish
bench 16 1 6 default perft
Nodes searched: 71608931810
./stockfish
position fen 4rrk1/1p1nq3/p7/2p1P1pp/3P2bp/3Q1Bn1/PPPB4/1K2R1NR w - - 40 21
go perft 6
Nodes searched: 6136386434
```
Passed STC:
LLR: 2.94 (-2.94,2.94) {-1.00,0.20}
Total: 16072 W: 1473 L: 1349 D: 13250
Ptnml(0-2): 57, 1047, 5710, 1159, 63
https://tests.stockfishchess.org/tests/view/60629e7ef183b42957b423b1
Passed LTC:
LLR: 2.94 (-2.94,2.94) {-0.70,0.20}
Total: 59064 W: 2214 L: 2177 D: 54673
Ptnml(0-2): 26, 1944, 25556, 1979, 27
https://tests.stockfishchess.org/tests/view/6062dce4f183b42957b423de
closes https://github.com/official-stockfish/Stockfish/pull/3415
No functional change
2021-03-31 07:47:15 +02:00
bmc4 and Stéphane Nicolet
5089061659
Change definition of between_bb()
...
We remark that in current master, most of our use cases for between_bb() can be
optimized if the second parameter of the function is added to the segment. So we
change the definition of between_bb(s1, s2) such that it excludes s1 but includes s2.
We also use a precomputed array for between_bb() for another small speed gain
(see https://tests.stockfishchess.org/tests/view/604d09f72433018de7a389fb ).
Passed STC:
LLR: 2.96 (-2.94,2.94) {-0.25,1.25}
Total: 18736 W: 1746 L: 1607 D: 15383
Ptnml(0-2): 61, 1226, 6644, 1387, 50
https://tests.stockfishchess.org/tests/view/60428c84ddcba5f0627bb6e4
Yellow LTC:
LTC:
LLR: -3.00 (-2.94,2.94) {0.25,1.25}
Total: 39144 W: 1431 L: 1413 D: 36300
Ptnml(0-2): 13, 1176, 17184, 1178, 21
https://tests.stockfishchess.org/tests/view/605128702433018de7a38ca1
Closes https://github.com/official-stockfish/Stockfish/pull/3397
---------
Verified for correctness by running perft on the following position:
./stockfish
position fen 4rrk1/1p1nq3/p7/2p1P1pp/3P2bp/3Q1Bn1/PPPB4/1K2R1NR w - - 40 21
go perft 6
Nodes searched: 6136386434
--------
No functional change
2021-03-18 00:21:41 +01:00
bmc4 and Stéphane Nicolet
830f597134
Simplify move generation (2/2)
...
STC:
LLR: 2.97 (-2.94,2.94) {-1.25,0.25}
Total: 39352 W: 3551 L: 3493 D: 32308
Ptnml(0-2): 143, 2695, 13928, 2781, 129
https://tests.stockfishchess.org/tests/view/6050007a2433018de7a38bbb
LTC:
LLR: 2.96 (-2.94,2.94) {-0.75,0.25}
Total: 44944 W: 1629 L: 1596 D: 41719
Ptnml(0-2): 22, 1319, 19762, 1342, 27
https://tests.stockfishchess.org/tests/view/60500e892433018de7a38bc4
Closes https://github.com/official-stockfish/Stockfish/pull/3399
No functional change
2021-03-16 22:34:23 +01:00
bmc4 and Stéphane Nicolet
4b509559fb
Simplify move generation (1/2)
...
STC:
LLR: 2.95 (-2.94,2.94) {-1.25,0.25}
Total: 29792 W: 2611 L: 2545 D: 24636
Ptnml(0-2): 94, 1982, 10659, 2086, 75
https://tests.stockfishchess.org/tests/view/604fe5b62433018de7a38ba8
LTC:
LLR: 2.92 (-2.94,2.94) {-0.75,0.25}
Total: 22040 W: 826 L: 777 D: 20437
Ptnml(0-2): 8, 646, 9664, 693, 9
https://tests.stockfishchess.org/tests/view/604fec892433018de7a38bac
Closes https://github.com/official-stockfish/Stockfish/pull/3399
No functional change
2021-03-16 22:32:53 +01:00
bmc4 and Stéphane Nicolet
939395729c
Introduce least_significant_square_bb()
...
Introducing least_significant_square_bb(). It is a function that returns a value equal
to square_bb(lsb(bb)), but it uses fewer instruction. It should speed up more on older
processors like armv7-a Clang.
Passed STC:
LLR: 2.93 (-2.94,2.94) {-0.25,1.25}
Total: 213200 W: 19171 L: 18753 D: 175276
Ptnml(0-2): 680, 14513, 75831, 14861, 715
https://tests.stockfishchess.org/tests/view/604bc7632433018de7a38982
Closes https://github.com/official-stockfish/Stockfish/pull/3391
No functional change
2021-03-16 20:54:52 +01:00
bmc4 and Joost VandeVondele
b74274628c
Use Bitboard over Square in movegen
...
It uses pos.checkers() on target when movegen is the type of EVASION.
It simplify the code. And it's also expected a slightly speed up,
because Bitboard is more direct when doing bitwise.
Passed STC:
LLR: 2.93 (-2.94,2.94) {-1.25,0.25}
Total: 28176 W: 2506 L: 2437 D: 23233
Ptnml(0-2): 80, 1904, 10063, 1949, 92
https://tests.stockfishchess.org/tests/view/60421d18ddcba5f0627bb6a9
Passed LTC:
LLR: 2.93 (-2.94,2.94) {-0.75,0.25}
Total: 9704 W: 402 L: 341 D: 8961
Ptnml(0-2): 3, 279, 4230, 334, 6
https://tests.stockfishchess.org/tests/view/60422823ddcba5f0627bb6ae
closes https://github.com/official-stockfish/Stockfish/pull/3383
No functional change
2021-03-07 21:16:38 +01:00
bmc4 and Joost VandeVondele
29ed22de8c
Search Parameters Tuning
...
A simple tuning on search.cpp.
based SPSA test:
https://tests.stockfishchess.org/tests/view/601f2a787f517a561bc493cd
passed STC:
LLR: 2.94 (-2.94,2.94) {-0.25,1.25}
Total: 117840 W: 10796 L: 10508 D: 96536
Ptnml(0-2): 422, 8381, 41041, 8639, 437
https://tests.stockfishchess.org/tests/view/602144c37f517a561bc494ae
passed LTC:
LLR: 2.96 (-2.94,2.94) {0.25,1.25}
Total: 25024 W: 972 L: 847 D: 23205
Ptnml(0-2): 7, 767, 10847, 876, 15
https://tests.stockfishchess.org/tests/view/602156877f517a561bc494be
closes https://github.com/official-stockfish/Stockfish/pull/3340
Bench: 3974098
2021-02-08 21:42:03 +01:00
bmc4 and Joost VandeVondele
9f8058bd26
Simplify En Passant
...
simplifies the handling of en passant during search, needs a little more care in initialization.
Passed STC:
LLR: 2.95 (-2.94,2.94) {-1.25,0.25}
Total: 72608 W: 6569 L: 6559 D: 59480
Ptnml(0-2): 233, 5117, 25629, 5057, 268
https://tests.stockfishchess.org/tests/view/600f1363735dd7f0f0352ce7
Passed LTC:
LLR: 2.92 (-2.94,2.94) {-0.75,0.25}
Total: 24328 W: 913 L: 864 D: 22551
Ptnml(0-2): 10, 731, 10633, 780, 10
https://tests.stockfishchess.org/tests/view/600f2e93735dd7f0f0352cf6
closes https://github.com/official-stockfish/Stockfish/pull/3330
No functional change.
2021-02-08 21:35:59 +01:00
bmc4 and Stéphane Nicolet
6617ad6e03
Tune ordering of moves at internal nodes
...
We change the relative weights of the function used to order
quiet moves in our MovePicker class.
Passed STC:
LLR: 2.94 (-2.94,2.94) {-0.25,1.25}
Total: 32184 W: 2936 L: 2773 D: 26475
Ptnml(0-2): 115, 2196, 11328, 2317, 136
https://tests.stockfishchess.org/tests/view/60161ee1735dd7f0f03530f8
Passed LTC:
LLR: 2.93 (-2.94,2.94) {0.25,1.25}
Total: 33088 W: 1292 L: 1149 D: 30647
Ptnml(0-2): 14, 1030, 14318, 1163, 19
https://tests.stockfishchess.org/tests/view/60163146735dd7f0f03530ff
The new weight were chosen after the following SPSA session:
https://tests.stockfishchess.org/tests/view/60136857735dd7f0f0352f6c
Closes https://github.com/official-stockfish/Stockfish/pull/3331
Bench: 4398803
2021-01-31 16:00:06 +01:00
bmc4 and Joost VandeVondele
dd96095214
Simplify Chess 960 castling
...
a little cleanup, and small speedup (about 0.3%) for Chess 960.
Verified with perft on a large set of chess960 positions.
Closes https://github.com/official-stockfish/Stockfish/pull/3317
No functional change
2021-01-31 10:07:02 +01:00
bmc4 and Joost VandeVondele
0db374777e
Speed Up Perft Search
...
It speeds up generate<LEGAL>, and thus perft, roughly by 2-3%.
closes https://github.com/official-stockfish/Stockfish/pull/3312
No functional change
2021-01-31 10:04:41 +01:00
bmc4 and Joost VandeVondele
befbcffb4e
Clean Up Castling in gives_check
...
There is no need to add rto or kto on the Bitboard which represents the pieces.
STC:
LLR: 2.93 (-2.94,2.94) {-1.25,0.25}
Total: 57064 W: 5096 L: 5067 D: 46901
Ptnml(0-2): 202, 3862, 20355, 3931, 182
https://tests.stockfishchess.org/tests/view/6005ea2c6019e097de3efa55
LTC:
LLR: 2.92 (-2.94,2.94) {-0.75,0.25}
Total: 30088 W: 1094 L: 1052 D: 27942
Ptnml(0-2): 10, 882, 13217, 926, 9
https://tests.stockfishchess.org/tests/view/6006115a6019e097de3efa6e
closes https://github.com/official-stockfish/Stockfish/pull/3311
No functional change.
2021-01-31 10:02:10 +01:00
bmc4 and Joost VandeVondele
7d0a16e06d
Avoid more expensive legality check
...
speedup of the code, enough to pass STC, failed LTC.
Passed STC:
LLR: 2.93 (-2.94,2.94) {-0.25,1.25}
Total: 68928 W: 6334 L: 6122 D: 56472
Ptnml(0-2): 233, 4701, 24369, 4943, 218
https://tests.stockfishchess.org/tests/view/6002747f6019e097de3ef8dc
Failed LTC:
LLR: -2.96 (-2.94,2.94) {0.25,1.25}
Total: 44560 W: 1702 L: 1675 D: 41183
Ptnml(0-2): 25, 1383, 19438, 1408, 26
https://tests.stockfishchess.org/tests/view/6002a4836019e097de3ef8e3
About 1% speedup:
Result of 50 runs
==================
base (...kfish.master) = 2237500 +/- 7428
test (...ckfish.patch) = 2267003 +/- 7017
diff = +29503 +/- 4774
speedup = +0.0132
P(speedup > 0) = 1.0000
closes https://github.com/official-stockfish/Stockfish/pull/3304
No functional change.
2021-01-31 10:00:17 +01:00
bmc4 and Joost VandeVondele
4d30438400
Remove Condition from Generate_Move Loop
...
it seems it's faster to handle blockers_for_king(~Us) outside loops
Passed STC:
LLR: 2.96 (-2.94,2.94) {-0.25,1.25}
Total: 22184 W: 2063 L: 1919 D: 18202
Ptnml(0-2): 63, 1485, 7855, 1623, 66
https://tests.stockfishchess.org/tests/view/5ffbee2f6019e097de3ef18d
closes https://github.com/official-stockfish/Stockfish/pull/3299
No functional change
2021-01-11 18:41:47 +01:00
