SFisGOD and Joost VandeVondele
f4c27cda1a
Reintroduce late irreversible move extension
...
Reintroduce vondele's late irreversible move extension for fortress keeping.
This was removed when we only had classical eval.
Now that we have the NNUE net, it seems that this is useful again.
STC:
LLR: 2.93 (-2.94,2.94) {-0.50,1.50}
Total: 5352 W: 787 L: 653 D: 3912
Ptnml(0-2): 34, 451, 1579, 571, 41
https://tests.stockfishchess.org/tests/view/5f2dc8ad61e3b6af64881ff0
LTC:
LLR: 2.94 (-2.94,2.94) {0.25,1.75}
Total: 14416 W: 1013 L: 891 D: 12512
Ptnml(0-2): 15, 722, 5623, 822, 26
https://tests.stockfishchess.org/tests/view/5f2e0e3661e3b6af6488201e
closes https://github.com/official-stockfish/Stockfish/pull/2936
Bench: 4154696
2020-08-08 08:33:24 +02:00
SFisGOD and Joost VandeVondele
1f3bd968bb
Introduce bad outpost penalty
...
In some French games, Stockfish likes to bring the Knight to a bad outpost spot. This is evident in TCEC S18 Superfinal Game 63, where there is a Knight outpost on the queenside but is actually useless. Stockfish is effectively playing a piece down while holding ground against Leela's break on the kingside.
This patch turns the +56 mg bonus for a Knight outpost into a -7 mg penalty if it satisfies the following conditions:
* The outpost square is not on the CenterFiles (i.e. not on files C,D,E and F)
* The knight is not attacking non pawn enemies.
* The side where the outpost is located contains only few enemies, with a particular conditional_more_than_two() implementation
Thank you to apospa...@gmail.com for bringing this to our attention and for providing insights.
See https://groups.google.com/forum/?fromgroups=#!topic/fishcooking/dEXNzSIBgZU
Reference game: https://tcec-chess.com/#div=sf&game=63&season=18
Passed STC:
LLR: 2.93 (-2.94,2.94) {-0.50,1.50}
Total: 6960 W: 1454 L: 1247 D: 4259
Ptnml(0-2): 115, 739, 1610, 856, 160
https://tests.stockfishchess.org/tests/view/5f08221059f6f0353289477e
Passed LTC:
LLR: 2.98 (-2.94,2.94) {0.25,1.75}
Total: 21440 W: 2767 L: 2543 D: 16130
Ptnml(0-2): 122, 1904, 6462, 2092, 140
https://tests.stockfishchess.org/tests/view/5f0838ed59f6f035328947a2
various related tests show strong test results, but so far no generalizations or simplifications of conditional_more_than_two() are found. See PR for details.
closes https://github.com/official-stockfish/Stockfish/pull/2803
Bench: 4366686
2020-07-11 11:23:55 +02:00
SFisGOD and Joost VandeVondele
67818ee948
Remove passed pawn condition.
...
This will help scale down relatively high eval in drawish rook endgames with passed pawn like in TCEC S18 Superfinal Game 90.
Passed STC
LLR: 2.94 (-2.94,2.94) {-1.50,0.50}
Total: 50456 W: 9644 L: 9540 D: 31272
Ptnml(0-2): 760, 5637, 12332, 5737, 762
https://tests.stockfishchess.org/tests/view/5efcb76e59f6f035328940ed
Passed LTC
LLR: 2.94 (-2.94,2.94) {-1.50,0.50}
Total: 77264 W: 9518 L: 9518 D: 58228
Ptnml(0-2): 402, 6766, 24321, 6716, 427
https://tests.stockfishchess.org/tests/view/5efd2ad759f6f03532894143
closes https://github.com/official-stockfish/Stockfish/pull/2792
Bench: 4431626
2020-07-03 21:09:22 +02:00
SFisGOD and Stéphane Nicolet
1fdf1f1ff5
Simplify endgame factor for opposite colored bishops
...
Stockfish is continually improving. Patches that gain elo in the past may
no longer be needed as stockfish improved elsewhere. This patch removes
passed pawns count dependence in opposite colored bishops scale factor.
We used the mean of passed count pawns (~1.4) to compensate, and changed
the base value from 16 to 22.
Passed STC:
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 57879 W: 12657 L: 12607 D: 32615
http://tests.stockfishchess.org/tests/view/5dd1644f42928ff08153dc1e
Passed LTC:
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 121648 W: 19622 L: 19659 D: 82367
http://tests.stockfishchess.org/tests/view/5dd24572ccb823d41d4b47bb
Closes https://github.com/official-stockfish/Stockfish/pull/2419
Bench: 5067864
2019-11-24 00:23:06 +01:00
SFisGOD and Stéphane Nicolet
a131975170
Rank-based outposts
...
Introduce OutpostRank[RANK_NB] which contains a bonus according to
the rank of the outpost. We use it for the primary Outpost bonus.
The values are based on the trends of the SPSA tuning run with some
manual tweaks.
Passed STC:
LLR: 2.96 (-2.94,2.94) [-1.50,4.50]
Total: 27454 W: 6059 L: 5869 D: 15526
http://tests.stockfishchess.org/tests/view/5dcadba20ebc590256922f09
Passed LTC:
LLR: 2.94 (-2.94,2.94) [0.00,3.50]
Total: 57950 W: 9443 L: 9112 D: 39395
http://tests.stockfishchess.org/tests/view/5dcaea880ebc5902569230bc
Bench: 4778405
----------------------------
The inspiration for this patch came from Stefan Geschwentner's attempt
of modifying BishopPawns into a rank-based penalty. Michael Stembera
suggested that maybe the S(0, 0) ranks (3rd, 7th and also maybe 8th)
can still be tuned. This would expand our definition of Outpost and
OutpostRanks would be removed altogether. Special thanks to Mark Tenzer
for all the help and excellent suggestions.
2019-11-13 11:01:00 +01:00
SFisGOD and Stéphane Nicolet
3804effb34
Rook PSQT Tuned
...
This patch uses about half the changes of the SPSA tuning run:
http://tests.stockfishchess.org/tests/view/5dba93d30ebc5925b64ed3bf
About a month ago, xoto10's patch raised the mg value of the third rank
center files from -1 to 7 to encourage rook lifts to the third rank. About
three days later, Rocky's patch lowered this value from 7 to 3. This patch
raises that again from 3 to 12 and ends up greater than the original rook
lift patch.
Passed STC:
LLR: 2.95 (-2.94,2.94) [-1.50,4.50]
Total: 104094 W: 22573 L: 22161 D: 59360
http://tests.stockfishchess.org/tests/view/5dbc77f20ebc5925b64ef1d0
Passed LTC:
LLR: 2.96 (-2.94,2.94) [0.00,3.50]
Total: 168291 W: 27410 L: 26777 D: 114104
http://tests.stockfishchess.org/tests/view/5dbd9f1e0ebc5925b64f0647
Bench: 4707799
2019-11-05 00:15:23 +01:00
SFisGOD and Stéphane Nicolet
474d133565
Combo of Parameter Tweaks
...
This patch is a combo of the following tweaks:
Complexity parameters
Knight PSQT
Bishop PSQT
King PSQT
Piece Values
Passed STC:
LLR: 2.95 (-2.94,2.94) [-1.50,4.50]
Total: 56527 W: 12326 L: 12052 D: 32149
http://tests.stockfishchess.org/tests/view/5dbbca3f0ebc5925b64ee6d6
Passed LTC:
LLR: 2.95 (-2.94,2.94) [0.00,3.50]
Total: 64010 W: 10549 L: 10199 D: 43262
http://tests.stockfishchess.org/tests/view/5dbc30dc0ebc5925b64eee0c
Closes https://github.com/official-stockfish/Stockfish/pull/2390
Bench: 4312945
2019-11-02 21:19:35 +01:00
SFisGOD and Stéphane Nicolet
0b0b21c608
Tweak kingFlankAttacks factor in kingDanger
...
Increase kingFlankAttacks factor in kingDanger from 5/16 to 6/16.
Failed STC:
LLR: -2.96 (-2.94,2.94) [0.00,4.00]
Total: 77947 W: 16989 L: 16848 D: 44110
http://tests.stockfishchess.org/tests/view/5d9ac0280ebc5902b6cf63cd
Passed LTC 1:
LLR: 2.96 (-2.94,2.94) [0.00,4.00]
Total: 13443 W: 2231 L: 2037 D: 9175
http://tests.stockfishchess.org/tests/view/5d9ac88d0ebc5902b6cf6ffb
Passed LTC 2:
LLR: 2.96 (-2.94,2.94) [0.00,4.00]
Total: 23340 W: 3842 L: 3617 D: 15881
http://tests.stockfishchess.org/tests/view/5d9acf7f0ebc5902b6cf7c27
Closes https://github.com/official-stockfish/Stockfish/pull/2349
Bench: 4042155
2019-10-07 11:14:33 +02:00
SFisGOD and Marco Costalba
58bbbd176b
Pawn value tweak
...
STC:
LLR: 2.96 (-2.94,2.94) [0.00,4.00]
Total: 47166 W: 10664 L: 10311 D: 26191
http://tests.stockfishchess.org/tests/view/5c7dfc370ebc5925cffdf830
LTC:
LLR: 2.95 (-2.94,2.94) [0.00,4.00]
Total: 35439 W: 6034 L: 5767 D: 23638
http://tests.stockfishchess.org/tests/view/5c7e41020ebc5925cffdfe9b
Bench: 3470519
2019-03-05 14:54:25 +01:00
SFisGOD and Stéphane Nicolet
31ac538f96
A combo of parameter tweaks
...
Joint work by SFisGOD, xoroshiro and Chess13234.
This combo consists of the following tweaks:
Assorted bonuses and penalties by SFisGOD
Bishop and Rook PSQT by SFisGOD
Tempo Value by xoroshiro
Futility pruning by Chess13234
STC:
LLR: 2.95 (-2.94,2.94) [0.00,4.00]
Total: 9005 W: 2082 L: 1882 D: 5041
http://tests.stockfishchess.org/tests/view/5c11628c0ebc5902ba119e90
LTC:
LLR: 2.95 (-2.94,2.94) [0.00,4.00]
Total: 44207 W: 7451 L: 7157 D: 29599
http://tests.stockfishchess.org/tests/view/5c1172a40ebc5902ba119fa3
Bench: 3332460
2018-12-13 13:35:35 +01:00
SFisGOD and Stéphane Nicolet
3f2ec5b3d5
Tweak Queen PSQT based on tuned values
...
STC: (Yellow)
LLR: -2.96 (-2.94,2.94) [0.00,4.00]
Total: 63140 W: 13433 L: 13353 D: 36354
http://tests.stockfishchess.org/tests/view/5bed42c90ebc595e0ae37cf5
LTC: (Green)
LLR: 2.95 (-2.94,2.94) [0.00,4.00]
Total: 47714 W: 7785 L: 7485 D: 32444
http://tests.stockfishchess.org/tests/view/5bec3b8c0ebc595e0ae36dec
Closes https://github.com/official-stockfish/Stockfish/pull/1816
Bench: 3717396
2018-11-19 10:50:55 +01:00
SFisGOD and Stéphane Nicolet
8a9c298dee
Rook PSQT Tuned
...
Failed STC (Yellow )
LLR: -2.96 (-2.94,2.94) [0.00,4.00]
Total: 56302 W: 12007 L: 11953 D: 32342
http://tests.stockfishchess.org/tests/view/5be69d210ebc595e0ae3185b
Passed 1st LTC (Green)
LLR: 2.95 (-2.94,2.94) [0.00,4.00]
Total: 8745 W: 1480 L: 1301 D: 5964
http://tests.stockfishchess.org/tests/view/5be682960ebc595e0ae31818
Failed 2nd LTC (Red)
LLR: -2.96 (-2.94,2.94) [0.00,4.00]
Total: 19398 W: 3040 L: 3133 D: 13225
http://tests.stockfishchess.org/tests/view/5be69b840ebc595e0ae31856
Passed 3rd LTC (Green)
LLR: 2.96 (-2.94,2.94) [0.00,4.00]
Total: 107516 W: 17342 L: 16858 D: 73316
http://tests.stockfishchess.org/tests/view/5bea879a0ebc595e0ae34d80
Closes https://github.com/official-stockfish/Stockfish/pull/1809
How to continue from there?
The values in the rook table now look a bit strange for a human eye
and are hard to explain, maybe it would be nice to simplify them
by hand and see if we can pass another (clean) double green with a
more regular array.
Bench: 3188070
2018-11-19 10:02:31 +01:00
SFisGOD and Stephane Nicolet
cd732c080b
Pawn and Piece Values Tuned at LTC
...
Failed STC
LLR: -2.96 (-2.94,2.94) [0.00,4.00]
Total: 27487 W: 5846 L: 5903 D: 15738
http://tests.stockfishchess.org/tests/view/5be1d3190ebc595e0ae2e5b8
Passed 1st LTC
LLR: 2.95 (-2.94,2.94) [0.00,4.00]
Total: 38503 W: 6270 L: 5999 D: 26234
http://tests.stockfishchess.org/tests/view/5be1f5ef0ebc595e0ae2e750
Passed 2nd LTC
LLR: 2.95 (-2.94,2.94) [0.00,4.00]
Total: 34016 W: 5584 L: 5326 D: 23106
http://tests.stockfishchess.org/tests/view/5be2a1970ebc595e0ae2f1b4
This pull request lead to an interesting discussion about testing
methodology for Stockfish:
https://github.com/official-stockfish/Stockfish/pull/1804
Bench: 3647775
2018-11-08 16:34:10 +01:00
SFisGOD and Stéphane Nicolet
4a0db9ea3c
Combo
...
Combo of two parameter tweaks and tuned values for Queen and ThreatByKing.
STC
LLR: 2.95 (-2.94,2.94) [0.00,4.00]
Total: 20180 W: 4439 L: 4198 D: 11543
http://tests.stockfishchess.org/tests/view/5bd7b8250ebc595e0ae22e97
LTC
LLR: 2.95 (-2.94,2.94) [0.00,4.00]
Total: 86312 W: 14106 L: 13685 D: 58521
http://tests.stockfishchess.org/tests/view/5bd803560ebc595e0ae23213
This combo consists of the following:
Queen Value (tuned values)
Iter: 72056, A: 5000, alpha 0.602000, gamma 0.101000, clipping old, rounding deterministic
param: QueenValueMg, best: 2528.91, start: 2528.00
param: QueenValueEg, best: 2687.12, start: 2698.00
ThreatByKing (tuned values)
Green STC (50.8k games)
http://tests.stockfishchess.org/tests/view/5bd1d5a00ebc595e0ae1cbec
LTC (I stopped this test at 71.2k games. It's likely yellow.)
http://tests.stockfishchess.org/tests/view/5bd263e70ebc595e0ae1d77e
WeakUnopposedPawn (tweak) by xoto (https://github.com/xoto10 )
Green STC (102.8k games)
http://tests.stockfishchess.org/tests/view/5bd306bb0ebc595e0ae1e146
Yellow LTC (90.8k games)
http://tests.stockfishchess.org/tests/view/5bd3ea660ebc595e0ae1f16b
aspiTune1 (tweak) by vondele (https://github.com/vondele )
Green STC (125.9k games)
http://tests.stockfishchess.org/tests/view/5bd2ae100ebc595e0ae1dab0
Yellow LTC (107.9k games)
http://tests.stockfishchess.org/tests/view/5bd3eb700ebc595e0ae1f16f
Thank you @31m059 (Mark Tenzer) for helping me! Also, thank you very much
for recognizing my efforts. I genuinely appreciate it.
Bench: 3556672
2018-11-01 15:39:19 +01:00
