Rui Coelho
2b0372319d
Use average complexity for time management
...
This patch is a variant of the idea by locutus2 (https://tests.stockfishchess.org/tests/view/61e1f24cb1f9959fe5d88168 ) to adjust the total time depending on the average complexity of the position.
Passed STC
LLR: 2.94 (-2.94,2.94) <0.00,2.50>
Total: 39664 W: 10765 L: 10487 D: 18412
Ptnml(0-2): 162, 4213, 10837, 4425, 195
https://tests.stockfishchess.org/tests/view/61e2df8b65a644da8c9ea708
Passed LTC
LLR: 2.94 (-2.94,2.94) <0.50,3.00>
Total: 127656 W: 34505 L: 34028 D: 59123
Ptnml(0-2): 116, 12435, 38261, 12888, 128
https://tests.stockfishchess.org/tests/view/61e31db5babab931824dff5e
closes https://github.com/official-stockfish/Stockfish/pull/3892
Bench: 4464962
2022-01-17 19:48:23 +01:00
proukornew
d11101e4c6
Improve logic on mingw
...
There is no need to point g++, if we explicitly choose mingw.
Now for cygwin:
make COMP=mingw ARCH=x86-64-modern build
closes https://github.com/official-stockfish/Stockfish/pull/3860
No functional change
2022-01-17 19:47:32 +01:00
Rui Coelho
7678d63cf2
Use complexity in search
...
This patch uses the complexity measure (from #3875 ) as a heuristic for null move pruning.
Hopefully, there may be room to use it in other pruning techniques.
I would like to thank vondele and locutus2 for the feedback and suggestions during testing.
Passed STC
LLR: 2.95 (-2.94,2.94) <0.00,2.50>
Total: 35000 W: 9624 L: 9347 D: 16029
Ptnml(0-2): 156, 3894, 9137, 4143, 170
https://tests.stockfishchess.org/tests/view/61dda784c65bf87d6c45ab80
Passed LTC
LLR: 2.94 (-2.94,2.94) <0.50,3.00>
Total: 230776 W: 64227 L: 63454 D: 103095
Ptnml(0-2): 1082, 23100, 66380, 23615, 1211
https://tests.stockfishchess.org/tests/view/61ddd0cf3ddbc32543e72c2b
Closes https://github.com/official-stockfish/Stockfish/pull/3890
Bench: 4464962
2022-01-13 22:25:01 +01:00
pschneider1968
c5d45d3220
Fix Makefile for compilation with clang on Windows
...
use static compilation and
added exclusion of -latomic for Clang/MSYS2 as per ppigazzini's suggestion
fixes #3872
closes https://github.com/official-stockfish/Stockfish/pull/3873
No functional change
2022-01-13 22:17:27 +01:00
Michael Chaly
44b1ba89a9
Adjust pruning constants
...
This patch is a modification of original tuning done by vondele that failed yellow.
Value differences are divided by 2.
Passed STC
https://tests.stockfishchess.org/tests/view/61d918239fea7913d9c64cdf
LLR: 2.94 (-2.94,2.94) <0.00,2.50>
Total: 98968 W: 26248 L: 25858 D: 46862
Ptnml(0-2): 392, 11085, 26156, 11443, 408
Passed LTC
https://tests.stockfishchess.org/tests/view/61d99e3c9fea7913d9c663e4
LLR: 2.95 (-2.94,2.94) <0.50,3.00>
Total: 215232 W: 58191 L: 57492 D: 99549
Ptnml(0-2): 271, 22124, 62138, 22801, 282
closes https://github.com/official-stockfish/Stockfish/pull/3885
bench 4572746
2022-01-10 19:35:53 +01:00
Joost VandeVondele
c5a280c012
Tune FRC trapped Bishop patch
...
now that fishtest can deal with FRC, retune this correction.
Add an additional fen to bench with cornered B and N.
passed STC:
LLR: 2.95 (-2.94,2.94) <0.00,2.50>
Total: 49672 W: 7358 L: 7082 D: 35232
Ptnml(0-2): 241, 4329, 15458, 4529, 279
https://tests.stockfishchess.org/tests/view/61d8b7bf9fea7913d9c63cb7
passed LTC:
LLR: 2.95 (-2.94,2.94) <0.50,3.00>
Total: 86688 W: 8308 L: 8007 D: 70373
Ptnml(0-2): 92, 4943, 32989, 5212, 108
https://tests.stockfishchess.org/tests/view/61d92dcb9fea7913d9c650ad
closes https://github.com/official-stockfish/Stockfish/pull/3884
Bench: 4326560
2022-01-09 15:49:19 +01:00
Joost VandeVondele
9ad0ea7382
Tune a few parameters related to evaluation
...
based on a SPSA tune (using Autoselect)
https://tests.stockfishchess.org/tests/view/61d5aa63a314fed318a57046
passed STC:
LLR: 2.93 (-2.94,2.94) <0.00,2.50>
Total: 61960 W: 16640 L: 16316 D: 29004
Ptnml(0-2): 278, 6934, 16204, 7314, 250
https://tests.stockfishchess.org/tests/view/61d7fe4af5fd40f357469a8d
passed LTC:
LLR: 2.97 (-2.94,2.94) <0.50,3.00>
Total: 79408 W: 21994 L: 21618 D: 35796
Ptnml(0-2): 106, 7887, 23331, 8285, 95
https://tests.stockfishchess.org/tests/view/61d836b7f5fd40f35746a3d5
closes https://github.com/official-stockfish/Stockfish/pull/3883
Bench: 4266621
2022-01-08 08:44:49 +01:00
Stéphane Nicolet
2efda17c2a
Update AUTHORS and CPU contributors files
...
closes https://github.com/official-stockfish/Stockfish/pull/3882
No functional change
2022-01-08 08:43:14 +01:00
Brad Knox
ad926d34c0
Update copyright years
...
Happy New Year!
closes https://github.com/official-stockfish/Stockfish/pull/3881
No functional change
2022-01-06 15:45:45 +01:00
lonfom169
0b41887527
Simplify away rangeReduction
...
Remove rangeReduction, introduced in [#3717 ](https://github.com/official-stockfish/Stockfish/pull/3717 ),
as it seemingly doesn't bring enough ELO anymore. It might be interesting to add
new forms of reduction or tune the reduction formula in the future.
STC:
LLR: 2.95 (-2.94,2.94) <-2.25,0.25>
Total: 45008 W: 12114 L: 11972 D: 20922
Ptnml(0-2): 174, 5031, 11952, 5173, 174
https://tests.stockfishchess.org/tests/view/61d08b7b069ca917749c9f6f
LTC:
LLR: 2.94 (-2.94,2.94) <-2.25,0.25>
Total: 30792 W: 8235 L: 8086 D: 14471
Ptnml(0-2): 24, 3162, 8882, 3297, 31
https://tests.stockfishchess.org/tests/view/61d0a6ad069ca917749ca420
closes https://github.com/official-stockfish/Stockfish/pull/3878
Bench: 4048312
2022-01-02 17:49:44 +01:00
lonfom169
061f98a9e3
Smooth out doDeeperSearch
...
Adjust threshold based on the difference between newDepth and LMR depth.
With more reduction, bigger fail-high is required in order to perform the deeper search.
STC:
LLR: 2.96 (-2.94,2.94) <0.00,2.50>
Total: 93576 W: 24133 L: 23758 D: 45685
Ptnml(0-2): 260, 10493, 24935, 10812, 288
https://tests.stockfishchess.org/tests/view/61cbb5cee68b2a714b6eaf09
LTC:
LLR: 2.94 (-2.94,2.94) <0.50,3.00>
Total: 109280 W: 28198 L: 27754 D: 53328
Ptnml(0-2): 60, 11225, 31637, 11647, 71
https://tests.stockfishchess.org/tests/view/61cc03fee68b2a714b6ec091
closes https://github.com/official-stockfish/Stockfish/pull/3877
Bench: 4464723
2021-12-31 07:44:15 +01:00
Stéphane Nicolet
1066119083
Tweak optimism with complexity
...
This patch increases the optimism bonus for "complex positions", where the
complexity is measured as the absolute value of the difference between material
and the sophisticated NNUE evaluation (idea by Joost VandeVondele).
Also rename some variables in evaluate() while there.
passed STC:
LLR: 2.94 (-2.94,2.94) <0.00,2.50>
Total: 88392 W: 23150 L: 22781 D: 42461
Ptnml(0-2): 318, 9961, 23257, 10354, 306
https://tests.stockfishchess.org/tests/view/61cbbedee68b2a714b6eb110
passed LTC:
LLR: 2.93 (-2.94,2.94) <0.50,3.00>
Total: 37848 W: 10043 L: 9766 D: 18039
Ptnml(0-2): 26, 3815, 10961, 4100, 22
https://tests.stockfishchess.org/tests/view/61cc0cc3e68b2a714b6ec28c
Closes https://github.com/official-stockfish/Stockfish/pull/3875
Follow-up from a5a89b27c8
2021-12-30 11:59:23 +01:00
bmc4
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
Joost VandeVondele
7d82f0d1f4
Update default net to nn-ac07bd334b62.nnue
...
Trained with essentially the same data as provided and used by Farseer (mbabigian)
for the previous master net.
T60T70wIsRightFarseerT60T74T75T76.binpack (99GB):
['T60T70wIsRightFarseer.binpack', 'farseerT74.binpack', 'farseerT75.binpack', 'farseerT76.binpack']
using the trainer branch tweakLR1PR (https://github.com/glinscott/nnue-pytorch/pull/158 ) and
`--gpus 1 --threads 4 --num-workers 4 --batch-size 16384 --progress_bar_refresh_rate 300 --smart-fen-skipping --random-fen-skipping 12 --features=HalfKAv2_hm^ --lambda=1.00` options
passed STC:
LLR: 2.95 (-2.94,2.94) <0.00,2.50>
Total: 108280 W: 28042 L: 27636 D: 52602
Ptnml(0-2): 328, 12382, 28401, 12614, 415
https://tests.stockfishchess.org/tests/view/61bcd8c257a0d0f327c34fbd
passed LTC:
LLR: 2.94 (-2.94,2.94) <0.50,3.00>
Total: 259296 W: 66974 L: 66175 D: 126147
Ptnml(0-2): 146, 27096, 74452, 27721, 233
https://tests.stockfishchess.org/tests/view/61bda70957a0d0f327c37817
closes https://github.com/official-stockfish/Stockfish/pull/3870
Bench: 4633875
2021-12-22 11:02:34 +01:00
Michael Chaly
0a6168089d
Fall back to NNUE if classical evaluation is much lower than threshold
...
The idea is that if classical eval returns a value much lower than the threshold of
its usage it most likely means that position isn't that simple
so we need the more precise NNUE evaluation.
passed STC:
https://tests.stockfishchess.org/tests/view/61bf3e7557a0d0f327c3c47a
LLR: 2.95 (-2.94,2.94) <0.00,2.50>
Total: 108072 W: 28007 L: 27604 D: 52461
Ptnml(0-2): 352, 12147, 28650, 12520, 367
passed LTC:
https://tests.stockfishchess.org/tests/view/61c0581657a0d0f327c3fa0c
LLR: 2.95 (-2.94,2.94) <0.50,3.00>
Total: 155096 W: 40392 L: 39841 D: 74863
Ptnml(0-2): 88, 15983, 44843, 16558, 76
closes https://github.com/official-stockfish/Stockfish/pull/3869
bench 4310422
2021-12-22 08:18:35 +01:00
bmc4
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
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
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
Stéphane Nicolet
74776dbcd5
Simplification in evaluate_nnue.cpp
...
Removes the test on non-pawn-material before applying the positional/materialistic bonus.
Passed STC:
LLR: 2.94 (-2.94,2.94) <-2.25,0.25>
Total: 46904 W: 12197 L: 12059 D: 22648
Ptnml(0-2): 170, 5243, 12479, 5399, 161
https://tests.stockfishchess.org/tests/view/61be57cf57a0d0f327c3999d
Passed LTC:
LLR: 2.95 (-2.94,2.94) <-2.25,0.25>
Total: 18760 W: 4958 L: 4790 D: 9012
Ptnml(0-2): 14, 1942, 5301, 2108, 15
https://tests.stockfishchess.org/tests/view/61bed1fb57a0d0f327c3afa9
closes https://github.com/official-stockfish/Stockfish/pull/3866
Bench: 4826206
2021-12-19 15:44:01 +01:00
George Sobala
ca51b45649
Fixes build failure on Apple M1 Silicon
...
This pull request selectively avoids `-mdynamic-no-pic` for gcc on Apple Silicon
(there was no problem with the default clang compiler).
fixes https://github.com/official-stockfish/Stockfish/issues/3847
closes https://github.com/official-stockfish/Stockfish/pull/3850
No functional change
2021-12-19 11:43:18 +01:00
Michael Chaly
fb7d3ab32e
Reintroduce futility pruning for captures
...
This is a reintroduction of an idea that was simplified away approximately 1 year ago.
There are some tweaks to it :
a) exclude promotions;
b) exclude Pv Nodes from it - Pv Nodes logic for captures is really different from non Pv nodes so it makes a lot of sense;
c) use a big grain of capture history - idea is taken from my recent patches in futility pruning.
passed STC
https://tests.stockfishchess.org/tests/view/61bd90f857a0d0f327c373b7
LLR: 2.96 (-2.94,2.94) <0.00,2.50>
Total: 86640 W: 22474 L: 22110 D: 42056
Ptnml(0-2): 268, 9732, 22963, 10082, 275
passed LTC
https://tests.stockfishchess.org/tests/view/61be094457a0d0f327c38aa3
LLR: 2.95 (-2.94,2.94) <0.50,3.00>
Total: 23240 W: 6079 L: 5838 D: 11323
Ptnml(0-2): 14, 2261, 6824, 2512, 9
https://github.com/official-stockfish/Stockfish/pull/3864
bench 4493723
2021-12-19 08:03:41 +01:00
Michael Chaly
0a318cdddf
Adjust reductions based on current node delta and root delta
...
This patch is a follow up of previous 2 patches that introduced more reductions for PV nodes with low delta and more pruning for nodes with low delta. Instead of writing separate heuristics now it adjust reductions based on delta / rootDelta - it allows to remove 3 separate adjustements of pruning/LMR in different places and also makes reduction dependence on delta and rootDelta smoother. Also now it works for all pruning heuristics and not just 2.
Passed STC
https://tests.stockfishchess.org/tests/view/61ba9b6c57a0d0f327c2d48b
LLR: 2.94 (-2.94,2.94) <0.00,2.50>
Total: 79192 W: 20513 L: 20163 D: 38516
Ptnml(0-2): 238, 8900, 21024, 9142, 292
passed LTC
https://tests.stockfishchess.org/tests/view/61baf77557a0d0f327c2eb8e
LLR: 2.96 (-2.94,2.94) <0.50,3.00>
Total: 158400 W: 41134 L: 40572 D: 76694
Ptnml(0-2): 101, 16372, 45745, 16828, 154
closes https://github.com/official-stockfish/Stockfish/pull/3862
bench 4651538
2021-12-18 17:19:21 +01:00
George Sobala
939b694bfd
Fix for profile-build failure using gcc on MacOS
...
Fixes https://github.com/official-stockfish/Stockfish/issues/3846 ,
where the profiling SF binary generated by GCC on MacOS would launch
but failed to quit. Tested with gcc-8, gcc9, gcc10, gcc-11.
The problem can be fixed by adding -fvisibility=hidden to the compiler
flags, see for example the following piece of Apple documentation:
https://developer.apple.com/library/archive/documentation/DeveloperTools/Conceptual/CppRuntimeEnv/Articles/SymbolVisibility.html
For instance this now works:
make -j8 profile-build ARCH=x86-64-avx2 COMP=gcc COMPCXX=g++-11
No functional change
2021-12-17 18:52:09 +01:00
pb00067
dc5d9bdfee
Remove lowPly history
...
Seems that after pull request #3731 (Capping stat bonus at 2000) this
heuristic is no longer useful.
STC:
https://tests.stockfishchess.org/tests/view/61b8d0e2dffbe89a35815444
LLR: 2.94 (-2.94,2.94) <-2.25,0.25>
Total: 30672 W: 7974 L: 7812 D: 14886
Ptnml(0-2): 106, 3436, 8072, 3634, 88
LTC:
https://tests.stockfishchess.org/tests/view/61b8e90cdffbe89a35815a67
LLR: 2.94 (-2.94,2.94) <-2.25,0.25>
Total: 42448 W: 10884 L: 10751 D: 20813
Ptnml(0-2): 23, 4394, 12267, 4507, 33
closes https://github.com/official-stockfish/Stockfish/pull/3853
bench: 4474950
2021-12-17 18:37:41 +01:00
bmc4
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
farseer
3bea736a2a
Update default net to nn-4401e826ebcc.nnue
...
Using data T60 12/1/20 to 11/2/2021, T74 4/22/21 to 7/27/21, T75 6/3/21 to 10/16/21, T76
(half of the randomly interleaved dataset due to a mistake merging) 11/10/21 to 11/21/21,
wrongIsRight_nodes5000pv2.binpack, and WrongIsRight-Reloaded.binpack combined and shuffled
position by position.
Trained with LR=4.375e-4 and WDL filtering enabled:
python train.py --smart-fen-skipping --random-fen-skipping 0 --features=HalfKAv2_hm^
--lambda=1.0 --max_epochs=800 --seed 910688689 --batch-size 16384
--progress_bar_refresh_rate 30 --threads 4 --num-workers 4 --gpus 1
--resume-from-model C:\msys64\home\Mike\nnue-pytorch\9b3d.pt
E:\trainingdata\T60-T74-T75-T76-WiR-WiRR-PbyP.binpack
E:\trainingdata\T60-T74-T75-T76-WiR-WiRR-PbyP.binpack
Passed STC
LLR: 2.94 (-2.94,2.94) <0.00,2.50>
Total: 41848 W: 10962 L: 10676 D: 20210 Elo +2.16
Ptnml(0-2): 142, 4699, 11016, 4865, 202
https://tests.stockfishchess.org/tests/view/61ba886857a0d0f327c2cfd6
Passed LTC
LLR: 2.94 (-2.94,2.94) <0.50,3.00>
Total: 27776 W: 7208 L: 6953 D: 13615 Elo + 3.00
Ptnml(0-2): 14, 2808, 8007, 3027, 32
https://tests.stockfishchess.org/tests/view/61baae4d57a0d0f327c2d96f
closes https://github.com/official-stockfish/Stockfish/pull/3856
Bench: 4667591
2021-12-17 18:12:47 +01:00
Joost VandeVondele
c6edf33f53
Remove NNUE scaling term
...
remove pawns scaling, probably correlated with piece scaling, and might be less useful with the recent improved nets. Might allow for another tune of the scaling params.
passed STC
https://tests.stockfishchess.org/tests/view/61afdb2e56fcf33bce7df31a
LLR: 2.95 (-2.94,2.94) <-2.25,0.25>
Total: 280864 W: 72198 L: 72399 D: 136267
Ptnml(0-2): 854, 32356, 74346, 31889, 987
passed LTC
https://tests.stockfishchess.org/tests/view/61b233a606b4c2dcb1b16140
LLR: 2.95 (-2.94,2.94) <-2.25,0.25>
Total: 400136 W: 102669 L: 103012 D: 194455
Ptnml(0-2): 212, 42005, 116047, 41522, 282
closes https://github.com/official-stockfish/Stockfish/pull/3851
Bench: 4735679
2021-12-14 13:41:12 +01:00
Joost VandeVondele
ea1ddb6aef
Update default net to nn-d93927199b3d.nnue
...
Using the same dataset as before but slightly reduced initial LR as in
https://github.com/vondele/nnue-pytorch/tree/tweakLR1
passed STC:
LLR: 2.94 (-2.94,2.94) <0.00,2.50>
Total: 51368 W: 13492 L: 13191 D: 24685
Ptnml(0-2): 168, 5767, 13526, 6042, 181
https://tests.stockfishchess.org/tests/view/61b61f43dffbe89a3580b529
passed LTC:
LLR: 2.94 (-2.94,2.94) <0.50,3.00>
Total: 45128 W: 11763 L: 11469 D: 21896
Ptnml(0-2): 24, 4583, 13063, 4863, 31
https://tests.stockfishchess.org/tests/view/61b6612edffbe89a3580c447
closes https://github.com/official-stockfish/Stockfish/pull/3848
Bench: 5121336
2021-12-13 07:17:25 +01:00
Stefan Geschwentner
d579db34a3
Simplify falling eval time factor.
...
Remove the difference to previous best score in falling eval calculation. As compensation double the effect of the difference to previous best average score.
STC:
LLR: 2.95 (-2.94,2.94) <-2.25,0.25>
Total: 86944 W: 22363 L: 22285 D: 42296
Ptnml(0-2): 273, 9227, 24396, 9301, 275
https://tests.stockfishchess.org/tests/view/61b111ce06b4c2dcb1b11546
LTC:
LLR: 2.96 (-2.94,2.94) <-2.25,0.25>
Total: 134944 W: 34606 L: 34596 D: 65742
Ptnml(0-2): 66, 12941, 41456, 12935, 74
https://tests.stockfishchess.org/tests/view/61b19ca206b4c2dcb1b13a8b
closes https://github.com/official-stockfish/Stockfish/pull/3841
Bench: 4729473
2021-12-11 15:56:38 +01:00
Joost VandeVondele
9db6ca8592
Update Top CPU Contributors
...
closes https://github.com/official-stockfish/Stockfish/pull/3842
No functional change
2021-12-11 15:55:32 +01:00
Michael Chaly
8e82345931
Adjust singular extension depth restriction
...
This patch is a modification of original idea by lonfom169 which had a good yellow run
- do singular extension search with depth threshold 6 unless this is a PvNode with is a part of a PV line -
for them set threshold to 8 instead.
Passed STC
https://tests.stockfishchess.org/tests/view/61b1080406b4c2dcb1b1128c
LLR: 2.95 (-2.94,2.94) <0.00,2.50>
Total: 84352 W: 21917 L: 21555 D: 40880
Ptnml(0-2): 288, 9524, 22185, 9896, 283
Passed LTC
https://tests.stockfishchess.org/tests/view/61b1860a06b4c2dcb1b134a1
LLR: 2.95 (-2.94,2.94) <0.50,3.00>
Total: 63520 W: 16575 L: 16237 D: 30708
Ptnml(0-2): 27, 6519, 18350, 6817, 47
https://github.com/official-stockfish/Stockfish/pull/3840
bench 4729473
2021-12-09 20:50:00 +01:00
Stefan Geschwentner
9451419912
Improve transposition table remplacement strategy
...
Increase chance that PV node replaces old entry in transposition table.
STC:
LLR: 2.93 (-2.94,2.94) <0.00,2.50>
Total: 46744 W: 12108 L: 11816 D: 22820
Ptnml(0-2): 156, 5221, 12344, 5477, 174
https://tests.stockfishchess.org/tests/view/61ae068356fcf33bce7d99d0
LTC:
LLR: 2.94 (-2.94,2.94) <0.50,3.00>
Total: 88464 W: 22912 L: 22513 D: 43039
Ptnml(0-2): 84, 9133, 25393, 9544, 78
https://tests.stockfishchess.org/tests/view/61ae973656fcf33bce7db3e1
closes https://github.com/official-stockfish/Stockfish/pull/3839
Bench: 5292488
2021-12-08 17:16:17 +01:00
Michael Chaly
c228f3196a
Introduce post-lmr extensions
...
This idea is somewhat similar to extentions in LMR but has a different flavour.
If result of LMR was really good - thus exceeded alpha by some pretty
big given margin, we can extend move after LMR in full depth search with 0 window.
The idea is that this move is probably a fail high with somewhat of a big
probability so extending it makes a lot of sense
passed STC
https://tests.stockfishchess.org/tests/view/61ad45ea56fcf33bce7d74b7
LLR: 2.94 (-2.94,2.94) <0.00,2.50>
Total: 59680 W: 15531 L: 15215 D: 28934
Ptnml(0-2): 193, 6711, 15734, 6991, 211
passed LTC
https://tests.stockfishchess.org/tests/view/61ad9ff356fcf33bce7d8646
LLR: 2.95 (-2.94,2.94) <0.50,3.00>
Total: 59104 W: 15321 L: 14992 D: 28791
Ptnml(0-2): 53, 6023, 17065, 6364, 47
closes https://github.com/official-stockfish/Stockfish/pull/3838
bench 4881329
2021-12-07 18:15:06 +01:00
Tomasz Sobczyk
4766dfc395
Optimize FT activation and affine transform for NEON.
...
This patch optimizes the NEON implementation in two ways.
The activation layer after the feature transformer is rewritten to make it easier for the compiler to see through dependencies and unroll. This in itself is a minimal, but a positive improvement. Other architectures could benefit from this too in the future. This is not an algorithmic change.
The affine transform for large matrices (first layer after FT) on NEON now utilizes the same optimized code path as >=SSSE3, which makes the memory accesses more sequential and makes better use of the available registers, which allows for code that has longer dependency chains.
Benchmarks from Redshift#161, profile-build with apple clang
george@Georges-MacBook-Air nets % ./stockfish-b82d93 bench 2>&1 | tail -4 (current master)
===========================
Total time (ms) : 2167
Nodes searched : 4667742
Nodes/second : 2154011
george@Georges-MacBook-Air nets % ./stockfish-7377b8 bench 2>&1 | tail -4 (this patch)
===========================
Total time (ms) : 1842
Nodes searched : 4667742
Nodes/second : 2534061
This is a solid 18% improvement overall, larger in a bench with NNUE-only, not mixed.
Improvement is also observed on armv7-neon (Raspberry Pi, and older phones), around 5% speedup.
No changes for architectures other than NEON.
closes https://github.com/official-stockfish/Stockfish/pull/3837
No functional changes.
2021-12-07 18:08:54 +01:00
Joost VandeVondele
b82d93ece4
Update default net to nn-63376713ba63.nnue.
...
same data set as previous trained nets, tuned the wdl model slightly for training.
https://github.com/vondele/nnue-pytorch/tree/wdlTweak1
passed STC:
https://tests.stockfishchess.org/tests/view/61abe9e456fcf33bce7d2834
LLR: 2.93 (-2.94,2.94) <0.00,2.50>
Total: 31720 W: 8385 L: 8119 D: 15216
Ptnml(0-2): 117, 3534, 8273, 3838, 98
passed LTC:
https://tests.stockfishchess.org/tests/view/61ac293756fcf33bce7d36cf
LLR: 2.96 (-2.94,2.94) <0.50,3.00>
Total: 136136 W: 35255 L: 34741 D: 66140
Ptnml(0-2): 114, 14217, 38894, 14727, 116
closes https://github.com/official-stockfish/Stockfish/pull/3836
Bench: 4667742
2021-12-07 12:40:48 +01:00
Michael Chaly
a3d425cf55
Assign extra bonus for previous move that caused a fail low more often
...
This patch allows to assign extra bonus for previous move that caused a fail low not only for PvNodes and cutNodes but also fo some allNodes - namely if the best result we could've got from the search is still far below alpha.
passed STC
https://tests.stockfishchess.org/tests/view/61aa26a49e8855bba1a36d96
LLR: 2.94 (-2.94,2.94) <0.00,2.50>
Total: 73808 W: 19183 L: 18842 D: 35783
Ptnml(0-2): 251, 8257, 19564, 8564, 268
passed LTC
https://tests.stockfishchess.org/tests/view/61aa7dc29e8855bba1a3814f
LLR: 2.94 (-2.94,2.94) <0.50,3.00>
Total: 142416 W: 36717 L: 36192 D: 69507
Ptnml(0-2): 106, 14799, 40862, 15346, 95
closes https://github.com/official-stockfish/Stockfish/pull/3835
bench 4724181
2021-12-06 07:42:04 +01:00
Stefan Geschwentner
7d44b43b3c
Tweak history initialization
...
Initialize continuation history with a slighlty negative value -71 instead of zero.
The idea is, because the most history entries will be later negative anyway, to shift
the starting values a little bit in the "correct" direction. Of course the effect of
initialization dimishes with greater depth so I had the apprehension that the LTC test
would be difficult to pass, but it passed.
STC:
LLR: 2.94 (-2.94,2.94) <0.00,2.50>
Total: 34520 W: 9076 L: 8803 D: 16641
Ptnml(0-2): 136, 3837, 9047, 4098, 142
https://tests.stockfishchess.org/tests/view/61aa52e39e8855bba1a3776b
LTC:
LLR: 2.93 (-2.94,2.94) <0.50,3.00>
Total: 75568 W: 19620 L: 19254 D: 36694
Ptnml(0-2): 44, 7773, 21796, 8115, 56
https://tests.stockfishchess.org/tests/view/61aa87d39e8855bba1a383a5
closes https://github.com/official-stockfish/Stockfish/pull/3834
Bench: 4674029
2021-12-05 18:13:49 +01:00
Stefan Geschwentner
18f2b12cd0
Tweak time management
...
Use for adjustment of the falling eval time factor now also the difference
between previous best average score and current best score.
STC:
LLR: 2.95 (-2.94,2.94) <0.00,2.50>
Total: 109216 W: 28296 L: 27900 D: 53020
Ptnml(0-2): 312, 11759, 30148, 11999, 390
https://tests.stockfishchess.org/tests/view/61aafa8d1b31b85bcfa29d9c
LTC:
LLR: 2.93 (-2.94,2.94) <0.50,3.00>
Total: 54096 W: 14091 L: 13787 D: 26218
Ptnml(0-2): 29, 5124, 16447, 5410, 38
https://tests.stockfishchess.org/tests/view/61abbbbd56fcf33bce7d1d64
closes https://github.com/official-stockfish/Stockfish/pull/3833
Bench: 4829419
2021-12-05 17:56:54 +01:00
bmc4
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
Joost VandeVondele
327060232a
Update default net to nn-cdf1785602d6.nnue
...
Same process as in e4a0c6c759https://tests.stockfishchess.org/tests/view/61a8611e4ed77d629d4e836e
passed LTC:
LLR: 2.94 (-2.94,2.94) <0.50,3.00>
Total: 115176 W: 29783 L: 29321 D: 56072
Ptnml(0-2): 68, 12039, 32936, 12453, 92
https://tests.stockfishchess.org/tests/view/61a8963e4ed77d629d4e8d9b
closes https://github.com/official-stockfish/Stockfish/pull/3830
Bench: 4829419
2021-12-04 10:31:22 +01:00
Michael Chaly
e4b7403f12
Do more aggressive pruning for some node types
...
This patch allows more aggressive futility/see based pruning for PV nodes with low delta and non-pv nodes.
Fixes some white space issues.
Passed STC
https://tests.stockfishchess.org/tests/view/61a5ed33d16c530b5dcc27cc
LLR: 2.95 (-2.94,2.94) <0.00,2.50>
Total: 182088 W: 47121 L: 46584 D: 88383
Ptnml(0-2): 551, 20687, 48037, 21212, 557
Passed LTC
https://tests.stockfishchess.org/tests/view/61a74dfdbd5c4360bcded0ac
LLR: 2.94 (-2.94,2.94) <0.50,3.00>
Total: 87136 W: 22494 L: 22103 D: 42539
Ptnml(0-2): 38, 8918, 25272, 9295, 45
closes https://github.com/official-stockfish/Stockfish/pull/3828
closes https://github.com/official-stockfish/Stockfish/pull/3829
bench 4332259
2021-12-03 08:54:46 +01:00
Gian-Carlo Pascutto
c9977aa0a8
Add AVX-VNNI support for Alder Lake and later.
...
In their infinite wisdom, Intel axed AVX512 from Alder Lake
chips (well, not entirely, but we kind of want to use the Gracemont
cores for chess!) but still added VNNI support.
Confusingly enough, this is not the same as VNNI256 support.
This adds a specific AVX-VNNI target that will use this AVX-VNNI
mode, by prefixing the VNNI instructions with the appropriate VEX
prefix, and avoiding AVX512 usage.
This is about 1% faster on P cores:
Result of 20 runs
==================
base (./clang-bmi2 ) = 3306337 +/- 7519
test (./clang-vnni ) = 3344226 +/- 7388
diff = +37889 +/- 4153
speedup = +0.0115
P(speedup > 0) = 1.0000
But a nice 3% faster on E cores:
Result of 20 runs
==================
base (./clang-bmi2 ) = 1938054 +/- 28257
test (./clang-vnni ) = 1994606 +/- 31756
diff = +56552 +/- 3735
speedup = +0.0292
P(speedup > 0) = 1.0000
This was measured on Clang 13. GCC 11.2 appears to generate
worse code for Alder Lake, though the speedup on the E cores
is similar.
It is possible to run the engine specifically on the P or E using binding,
for example in linux it is possible to use (for an 8 P + 8 E setup like i9-12900K):
taskset -c 0-15 ./stockfish
taskset -c 16-23 ./stockfish
where the first call binds to the P-cores and the second to the E-cores.
closes https://github.com/official-stockfish/Stockfish/pull/3824
No functional change
2021-12-03 08:51:06 +01:00
bmc4
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
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
Michael Ortmann
4b86ef8c4f
Fix typos in comments, adjust readme
...
closes https://github.com/official-stockfish/Stockfish/pull/3822
also adjusts readme as requested in https://github.com/official-stockfish/Stockfish/pull/3816
No functional change
2021-12-01 18:07:30 +01:00
hengyu
64f21ecdae
Small clean-up
...
remove unneeded calculation.
closes https://github.com/official-stockfish/Stockfish/pull/3807
No functional change.
2021-12-01 17:59:20 +01:00
pb00067
282644f141
Remove depth dependence and use same limit (2000) as stat_bonus
...
STC:
https://tests.stockfishchess.org/tests/view/619df59dc0a4ea18ba95a424
LLR: 2.96 (-2.94,2.94) <-2.25,0.25>
Total: 83728 W: 21329 L: 21242 D: 41157
Ptnml(0-2): 297, 9669, 21847, 9752, 299
LTC:
https://tests.stockfishchess.org/tests/view/619e64d7c0a4ea18ba95a475
LLR: 2.94 (-2.94,2.94) <-2.25,0.25>
Total: 79888 W: 20238 L: 20155 D: 39495
Ptnml(0-2): 57, 8391, 22980, 8444, 73
closes https://github.com/official-stockfish/Stockfish/pull/3806
bench: 6792010
2021-12-01 17:55:23 +01:00
noobpwnftw
ca3c1c5f3a
Enable compilation on older Windows systems
...
Improve compatibility of the last NUMA patch when running under older versions of Windows,
for instance Windows Server 2003. Reported by user "g3g6" in the following comments:
7218ec4df9https://github.com/official-stockfish/Stockfish/pull/3821
No functional change
2021-11-30 20:57:47 +01:00
Joost VandeVondele
e4a0c6c759
Update default net to nn-4f56ecfca5b7.nnue
...
New net trained with nnue-pytorch, started from a master net on a data set of Leela
(T60.binpack+T74.binpck) Stockfish data (wrongIsRight_nodes5000pv2.binpack), and
Michael Babigian's conversion of T60 Leela data (including TB7 rescoring) (farseer.binpack)
available as a single interleaved binpack:
https://drive.google.com/file/d/1_sQoWBl31WAxNXma2v45004CIVltytP8/view?usp=sharing
The nnue-pytorch branch used is https://github.com/vondele/nnue-pytorch/tree/wdl
passed STC:
https://tests.stockfishchess.org/tests/view/61a3cc729f0c43dae1c71f1b
LLR: 2.95 (-2.94,2.94) <0.00,2.50>
Total: 49152 W: 12842 L: 12544 D: 23766
Ptnml(0-2): 154, 5542, 12904, 5804, 172
passed LTC:
https://tests.stockfishchess.org/tests/view/61a43c6260afd064f2d724f1
LLR: 2.96 (-2.94,2.94) <0.50,3.00>
Total: 25528 W: 6676 L: 6425 D: 12427
Ptnml(0-2): 9, 2593, 7315, 2832, 15
closes https://github.com/official-stockfish/Stockfish/pull/3816
Bench: 6885242
2021-11-29 12:56:01 +01:00
Michael Chaly
af050e5eed
Refine futility pruning for parent nodes
...
This patch is a result of refining of tuning vondele did after
new net passed and some hand-made values adjustements - excluding
changes in other pruning heuristics and rounding value of history
divisor to the nearest power of 2.
With this patch futility pruning becomes more aggressive and
history influence on it is doubled again.
passed STC
https://tests.stockfishchess.org/tests/view/61a2c4c1a26505c2278c150d
LLR: 2.94 (-2.94,2.94) <0.00,2.50>
Total: 33848 W: 8841 L: 8574 D: 16433
Ptnml(0-2): 100, 3745, 8988, 3970, 121
passed LTC
https://tests.stockfishchess.org/tests/view/61a327ffa26505c2278c26d9
LLR: 2.94 (-2.94,2.94) <0.50,3.00>
Total: 22272 W: 5856 L: 5614 D: 10802
Ptnml(0-2): 12, 2230, 6412, 2468, 14
closes https://github.com/official-stockfish/Stockfish/pull/3814
bench 6302543
2021-11-28 14:25:06 +01:00
