jirayu_sri/stockfish
1
0
Fork 0
mirror of https://github.com/official-stockfish/Stockfish.git synced 2026-07-22 12:47:08 +00:00
Code Issues Packages Projects Releases Wiki Activity
4,979 Commits 6 Branches 60 Tags
4ab8b0b738fe4ae58588efb421fd7b1643b2ef66
Commit Graph
18 Commits
This Branch
This Branch
All Branches
Author SHA1 Message Date
Moez JellouliandJoost VandeVondele 3368d03285 update Null Move Pruning parameters 
STC: https://tests.stockfishchess.org/tests/view/5f2dc38561e3b6af64881fec
LLR: 2.99 (-2.94,2.94) {-0.50,1.50}
Total: 6120 W: 903 L: 758 D: 4459
Ptnml(0-2): 44, 535, 1775, 644, 62

LTC: https://tests.stockfishchess.org/tests/view/5f2dd55f61e3b6af64882003
LLR: 2.95 (-2.94,2.94) {0.25,1.75}
Total: 7424 W: 577 L: 463 D: 6384
Ptnml(0-2): 16, 375, 2824, 473, 24

closes https://github.com/official-stockfish/Stockfish/pull/2942

bench 4107833
 2020-08-08 22:07:51 +02:00
MJZ1977andJoost VandeVondele 3dca13a958 NNUE evaluation threshold 
The idea is to use NNUE only on quite balanced material positions. This bring a big speedup on research since NNUE eval is slower than classical eval for most of the hardwares and specially on unbalanced positions with LazyEval.

STC: https://tests.stockfishchess.org/tests/view/5f2c2680b3ebe5cbfee85b61
LLR: 2.95 (-2.94,2.94) {-0.50,1.50}
Total: 3168 W: 560 L: 400 D: 2208
Ptnml(0-2): 21, 294, 819, 404, 46

LTC: https://tests.stockfishchess.org/tests/view/5f2c2ca6b3ebe5cbfee85b69
LLR: 2.98 (-2.94,2.94) {0.25,1.75}
Total: 3200 W: 287 L: 183 D: 2730
Ptnml(0-2): 4, 149, 1191, 251, 5

closes https://github.com/official-stockfish/Stockfish/pull/2916

Bench 4746616
 2020-08-06 21:46:31 +02:00
Moez JellouliandJoost VandeVondele 784263596f Minimal thinking time, even if only one rootMove. 
without search, the eval returned can be misleading (e.g. mate instead of draw),
leading to wrong adjudication. With a minimal search, this is avoided.
This patch leads to 1ms long searches if there is only 1 move,
similar patches all indicate a small Elo gain.

Fixes https://github.com/official-stockfish/Stockfish/issues/2707

Passed non-regression STC:
LLR: 2.93 (-2.94,2.94) {-1.50,0.50}
Total: 22312 W: 4350 L: 4204 D: 13758
Ptnml(0-2): 323, 2488, 5437, 2536, 372
https://tests.stockfishchess.org/tests/view/5ed562b0f29b40b0fc95a7d0

closes https://github.com/official-stockfish/Stockfish/pull/2709

Bench: 4733799
 2020-06-06 15:58:50 +02:00
Moez JellouliandJoost VandeVondele 16566a8fcf Singular quiet LMR 
If ttMove is a capture and had a singular extension, it is probably the best move.
No need to make a decrease of LMR on other moves.

STC
LLR: 2.96 (-2.94,2.94) {-0.50,1.50}
Total: 41968 W: 8170 L: 7918 D: 25880
Ptnml(0-2): 733, 4770, 9726, 5022, 733
https://tests.stockfishchess.org/tests/view/5ed6b666f29b40b0fc95a884

LTC
LLR: 2.95 (-2.94,2.94) {0.25,1.75}
Total: 71376 W: 9200 L: 8827 D: 53349
Ptnml(0-2): 486, 6544, 21342, 6743, 573
https://tests.stockfishchess.org/tests/view/5ed7578bf29b40b0fc95a8c9

closes https://github.com/official-stockfish/Stockfish/pull/2713

Bench: 4733799
 2020-06-04 19:03:54 +02:00
Moez JellouliandJoost VandeVondele 7f2c8a2b81 Remove attacked pawns from storm evaluation 
STC:
LLR: 2.96 (-2.94,2.94) {-0.50,1.50}
Total: 54456 W: 11009 L: 10737 D: 32710
Ptnml(0-2): 929, 6326, 12523, 6444, 1006
https://tests.stockfishchess.org/tests/view/5ec962e4404591b2793008a5

LTC:
LLR: 2.94 (-2.94,2.94) {0.25,1.75}
Total: 62448 W: 9018 L: 8664 D: 44766
Ptnml(0-2): 462, 5928, 18121, 6220, 493
https://tests.stockfishchess.org/tests/view/5ec976a8a586eee45aa2ab40

Non regression STC with "noob_3moves.epd" opening book
LLR: 3.81 (-2.94,2.94) {-1.50,0.50}
Total: 91896 W: 17770 L: 17653 D: 56473
Ptnml(0-2): 1598, 10782, 21124, 10793, 1651
https://tests.stockfishchess.org/tests/view/5ec9b83ea586eee45aa2ab96

closes https://github.com/official-stockfish/Stockfish/pull/2698

Bench 4488597
 2020-05-25 22:15:13 +02:00
Moez JellouliandJoost VandeVondele 66ed8b6c47 Tune pawn value 
Small tune of PawnValue parameters -4 / -7 with "closedpos.epd" opening book.

STC:
LLR: 2.96 (-2.94,2.94) {-0.50,1.50}
Total: 58776 W: 11787 L: 11511 D: 35478
Ptnml(0-2): 975, 6876, 13443, 7086, 1008
https://tests.stockfishchess.org/tests/view/5eb5aa712326444a3b6d3e33

LTC:
LLR: 2.98 (-2.94,2.94) {0.25,1.75}
Total: 137544 W: 19687 L: 19115 D: 98742
Ptnml(0-2): 988, 13219, 39901, 13561, 1103
https://tests.stockfishchess.org/tests/view/5eb67a392326444a3b6d3e9a

Non regression STC with "noob_3moves.epd" opening book
LLR: 2.94 (-2.94,2.94) {-1.50,0.50}
Total: 98168 W: 18545 L: 18499 D: 61124
Ptnml(0-2): 1647, 11396, 22951, 11444, 1646
https://tests.stockfishchess.org/tests/view/5eb7e489e0300e8e8c896203

closes https://github.com/official-stockfish/Stockfish/pull/2670

Bench 4696646
 2020-05-11 20:46:39 +02:00
Moez JellouliandJoost VandeVondele 09f53dbfa5 Weak queen protection 
Extra penalty if weak piece is only protected by a queen.

STC:
http://tests.stockfishchess.org/tests/view/5e53c6ab84a82b4acd4148fa
LLR: 2.96 (-2.94,2.94) {-0.50,1.50}
Total: 44630 W: 8615 L: 8359 D: 27656
Ptnml(0-2): 746, 5156, 10323, 5276, 814

LTC:
http://tests.stockfishchess.org/tests/view/5e54e05d84a82b4acd414947
LLR: 2.94 (-2.94,2.94) {0.25,1.75}
Total: 175480 W: 23085 L: 22409 D: 129986
Ptnml(0-2): 1264, 16494, 51678, 16910, 1394

closes https://github.com/official-stockfish/Stockfish/pull/2564

Bench: 4923286
 2020-02-27 13:14:51 +01:00
Moez JellouliandStéphane Nicolet 53125902e4 Extend last non-pawn captures 
Extend last non-pawn captures at principal variation nodes because
they are in general decisive moves with clear endgame result.

STC
http://tests.stockfishchess.org/tests/view/5ddafc86e75c0005326d2140
LLR: 2.96 (-2.94,2.94) [-1.50,4.50]
Total: 9892 W: 2238 L: 2099 D: 5555

LTC
http://tests.stockfishchess.org/tests/view/5ddb0401e75c0005326d2150
LLR: 2.95 (-2.94,2.94) [0.00,3.50]
Total: 30369 W: 5013 L: 4756 D: 20600

Closes https://github.com/official-stockfish/Stockfish/pull/2425

Bench: 5059526
 2019-11-26 00:01:49 +01:00
Moez JellouliandStéphane Nicolet e6f4b5f463 More accurate pawn attack span definition 
Tweak the pawn attack span for backward pawns and the zone behind
opponent opposing pawns. This is important in positional play and
one of weaknesses of the engine in recent high level games.

STC
LLR: -2.95 (-2.94,2.94) [0.50,4.50]
Total: 66843 W: 14884 L: 14717 D: 37242
http://tests.stockfishchess.org/tests/view/5d8dcb1b0ebc590f3beb2956

LTC
LLR: 2.96 (-2.94,2.94) [0.00,3.50]
Total: 77699 W: 12993 L: 12602 D: 52104
http://tests.stockfishchess.org/tests/view/5d8de9bc0ebc590f3beb3d00

See discussion in https://github.com/official-stockfish/Stockfish/pull/2332

Bench: 4012371
 2019-10-02 13:37:00 +02:00
Moez JellouliandMarco Costalba 2d9fac1e13 Simplify reduction formula #2122 
Simplify reduction formula

No functional change.
 2019-05-15 10:26:32 +02:00
MJZ1977andMarco Costalba e89bc30fdc Shuffle detection #2108 
Bench: 3402947
 2019-04-27 11:25:23 +02:00
Moez JellouliandMarco Costalba 0f63b35120 Remove pureStaticEval #2069 
Remove pureStaticEval variable and keep only one
static evaluation (ss->staticEval).

STC
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 64617 W: 14348 L: 14312 D: 35957 Elo -0.24
http://tests.stockfishchess.org/tests/view/5c9e1ad70ebc5925cfffc106

LTC
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 82200 W: 13703 L: 13680 D: 54817 Elo -0.24
http://tests.stockfishchess.org/tests/view/5c9e4efd0ebc5925cfffc68b

Bench : 3506898
 2019-04-04 09:40:34 +02:00
Moez JellouliandMarco Costalba aa0166fba6 Add attacked by 2 pawns to attackedBy2 (#2074) 
Add squares attacked by 2 pawns to the attackedBy2 array

STC :
LLR: -2.95 (-2.94,2.94) [0.50,4.50]
Total: 132722 W: 29583 L: 29090 D: 74049
http://tests.stockfishchess.org/tests/view/5ca231ba0ebc5925cf000794

LTC :
LLR: 2.95 (-2.94,2.94) [0.00,3.50]
Total: 94589 W: 16161 L: 15718 D: 62710
http://tests.stockfishchess.org/tests/view/5ca25d180ebc5925cf000ba4

Bench: 3337864
 2019-04-04 08:49:35 +02:00
Moez JellouliandMarco Costalba 76f1807baa Shuffle detection #2064 
Shuffle detection procedure :

Shuffling positions are detected if

    the last 36 moves are reversible (rule50_count() > 36),
    the position have been already in the TT,
    there is a still a pawn on the board (to avoid special endings like KBN vs K).

The position is then judged as a draw.

An extension is realized if we already made 14 successive reversible moves in PV to accelerate the detection of the eventual draw.

To go further : we can still improve the idea. The length of the tests need a lot of ressources.

    the limit of 36 is logic but must be checked again for special zugzwang positions,
    this limit can be decreased in special positions,
    the limit of 14 moves for extension has not been tuned.

STC
LLR: -2.94 (-2.94,2.94) [0.50,4.50]
Total: 32595 W: 7273 L: 7275 D: 18047 Elo +0.43
http://tests.stockfishchess.org/tests/view/5c90aa330ebc5925cfff1768

LTC
LLR: 2.95 (-2.94,2.94) [0.00,3.50]
Total: 51249 W: 8807 L: 8486 D: 33956 Elo +1.85
http://tests.stockfishchess.org/tests/view/5c90b2450ebc5925cfff1800

VLTC
LLR: 2.96 (-2.94,2.94) [0.00,3.50]
Total: 137974 W: 20503 L: 19983 D: 97488 Elo +1.05
http://tests.stockfishchess.org/tests/view/5c9243a90ebc5925cfff2a93

Bench: 3548313
 2019-03-31 10:51:08 +02:00
MJZ1977andStéphane Nicolet e51244cb27 ProbCutCount limit dependancy to cutNode 
Use the ProbCutCount limit `2 + 2 * cutNode` instead of constant 3.

STC
LLR: -2.95 (-2.94,2.94) [0.50,4.50]
Total: 61812 W: 13599 L: 13459 D: 34754
http://tests.stockfishchess.org/tests/view/5c6d19240ebc5925cffca07a

LTC
LLR: 2.96 (-2.94,2.94) [0.00,3.50]
Total: 27549 W: 4614 L: 4363 D: 18572
http://tests.stockfishchess.org/tests/view/5c6d45c10ebc5925cffca7a6

Closes https://github.com/official-stockfish/Stockfish/pull/2015

Bench: 3368889
 2019-02-21 19:36:48 +01:00
MJZ1977andStéphane Nicolet 70880b8e24 Flag critical search tree in hash table 
Introducing new concept, saving principal lines into the transposition table
to generate a "critical search tree" which we can reuse later for intelligent
pruning/extension decisions.

For instance in this patch we just reduce reduction for these lines. But a lot
of other ideas are possible.

To go further : tune some parameters, how to add or remove lines from the
critical search tree, how to use these lines in search choices, etc.

STC :
LLR: 2.94 (-2.94,2.94) [0.50,4.50]
Total: 59761 W: 13321 L: 12863 D: 33577 +2.23 ELO
http://tests.stockfishchess.org/tests/view/5c34da5d0ebc596a450c53d3

LTC :
LLR: 2.96 (-2.94,2.94) [0.00,3.50]
Total: 26826 W: 4439 L: 4191 D: 18196 +2.9 ELO
http://tests.stockfishchess.org/tests/view/5c35ceb00ebc596a450c65b2

Special thanks to Miguel Lahoz for his help in transposition table in/out.

Bench: 3399866
 2019-01-09 15:05:33 +01:00
MJZ1977andStéphane Nicolet 10bb2e6cdb Fix bug with "excludedMove" for probcut 
Bugfix: "excludedMove" has to be skipped in the probcut loop too.
If it is not skipped, the probcut can exit quickly with a wrong return
value corresponding to the excluded move. See the following forum
thread for a discussion:
https://groups.google.com/forum/?fromgroups=#!topic/fishcooking/GGithf_VwSU

STC :
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 17130 W: 3747 L: 3617 D: 9766
http://tests.stockfishchess.org/tests/view/5b8460c40ebc5902bdbb999a

LTC :
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 12387 W: 2064 L: 1930 D: 8393
http://tests.stockfishchess.org/tests/view/5b8466f90ebc5902bdbb9a21

To go further : it can be perhaps useful to tune the singular extension
search parameters.

Closes https://github.com/official-stockfish/Stockfish/pull/1754

Bench: 4308541
 2018-08-29 02:28:09 +02:00
MJZ1977andStéphane Nicolet 5a7cdadfb3 Penalty for bad bishop with blocked central files 
We increase the penalty for bad bishops by a factor proportional
to the number of our blocked pawns in the center files C, D, E or F.

STC:
LLR: 2.97 (-2.94,2.94) [0.00,5.00]
Total: 8868 W: 1870 L: 1700 D: 5298
http://tests.stockfishchess.org/html/live_elo.html?5ae7674f0ebc590e39268b34

LTC:
LLR: 2.95 (-2.94,2.94) [0.00,5.00]
Total: 5813 W: 950 L: 808 D: 4055
http://tests.stockfishchess.org/html/live_elo.html?5ae77bae0ebc5926dba90dd9

Closes https://github.com/official-stockfish/Stockfish/pull/1573

Bench: 5364190
 2018-05-01 07:12:27 +02:00