Stockfish

[Homayoun]

Author: Michael Chaly
Date: Sat Oct 14 16:52:35 2023 +0200
Timestamp: 1697295155

Use more continuation histories.

This patch allows stats updates and movepicker bonuses for continuation history 3 plies deep - so counter counter move.
Updates and movepicker usage are done with 1/4 multiplier compared to other histories.

Passed STC:
https://tests.stockfishchess.org/tests/ ... 8fc7ebb5a3
LLR: 2.96 (-2.94,2.94) <0.00,2.00>
Total: 161344 W: 41369 L: 40868 D: 79107 Elo +1.08
Ptnml(0-2): 535, 18720, 41679, 19185, 553

Passed LTC:
https://tests.stockfishchess.org/tests/ ... 8fc7ebd1d6
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 48564 W: 12556 L: 12215 D: 23793 Elo +2.44
Ptnml(0-2): 25, 5149, 13595, 5486, 27

closes https://github.com/official-stockfish/S ... /pull/4827

bench 1327410
see source:https://github.com/official-stockfish/S ... b6ca4ec2cd

https://abrok.eu/stockfish/

[Homayoun]

Author: mstembera
Date: Sat Oct 21 10:37:27 2023 +0200
Timestamp: 1697877447

Scale down stat bonus

STC https://tests.stockfishchess.org/tests/ ... 2d08d33353
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 88224 W: 22618 L: 22228 D: 43378 Elo +1.54
Ptnml(0-2): 282, 10177, 22783, 10609, 261

LTC https://tests.stockfishchess.org/tests/ ... 2d08d3481a
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 143508 W: 36674 L: 36142 D: 70692 Elo +1.29
Ptnml(0-2): 92, 15240, 40534, 15820, 68

Reduces the stat bonus by 20%. Maybe future patches can tune the actual bonus calculations for different histories.

closes https://github.com/official-stockfish/S ... /pull/4836

bench: 1185932
see source: https://github.com/official-stockfish/S ... 5b07f963b4

https://abrok.eu/stockfish/
Note: Today we had 8 updates. the latest is one described above.

[Sedat Canbaz]

Author: mstembera
Date: Sat Oct 21 10:37:27 2023 +0200
Timestamp: 1697877447

Scale down stat bonus

STC https://tests.stockfishchess.org/tests/ ... 2d08d33353
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 88224 W: 22618 L: 22228 D: 43378 Elo +1.54
Ptnml(0-2): 282, 10177, 22783, 10609, 261

LTC https://tests.stockfishchess.org/tests/ ... 2d08d3481a
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 143508 W: 36674 L: 36142 D: 70692 Elo +1.29
Ptnml(0-2): 92, 15240, 40534, 15820, 68

Reduces the stat bonus by 20%. Maybe future patches can tune the actual bonus calculations for different histories.

closes https://github.com/official-stockfish/S ... /pull/4836

bench: 1185932
see source: https://github.com/official-stockfish/S ... 5b07f963b4

https://abrok.eu/stockfish/
Note: Today we had 8 updates. the latest is one described above.

Mr. Homayoun,

Thanks a lot for your all news, updates...

Greetings )

[Homayoun]

Author: mstembera
Date: Sat Oct 21 10:37:27 2023 +0200
Timestamp: 1697877447

Scale down stat bonus

STC https://tests.stockfishchess.org/tests/ ... 2d08d33353
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 88224 W: 22618 L: 22228 D: 43378 Elo +1.54
Ptnml(0-2): 282, 10177, 22783, 10609, 261

LTC https://tests.stockfishchess.org/tests/ ... 2d08d3481a
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 143508 W: 36674 L: 36142 D: 70692 Elo +1.29
Ptnml(0-2): 92, 15240, 40534, 15820, 68

Reduces the stat bonus by 20%. Maybe future patches can tune the actual bonus calculations for different histories.

closes https://github.com/official-stockfish/S ... /pull/4836

bench: 1185932
see source: https://github.com/official-stockfish/S ... 5b07f963b4


https://abrok.eu/stockfish/
Note: Today we had 8 updates. the latest is one described above.

Mr. Homayoun,

Thanks a lot for your all news, updates...

Greetings )

thanks,too.

[xycl]

Author: mstembera
Date: Sat Oct 21 10:37:27 2023 +0200
Timestamp: 1697877447

Scale down stat bonus

STC https://tests.stockfishchess.org/tests/ ... 2d08d33353
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 88224 W: 22618 L: 22228 D: 43378 Elo +1.54
Ptnml(0-2): 282, 10177, 22783, 10609, 261

LTC https://tests.stockfishchess.org/tests/ ... 2d08d3481a
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 143508 W: 36674 L: 36142 D: 70692 Elo +1.29
Ptnml(0-2): 92, 15240, 40534, 15820, 68

Reduces the stat bonus by 20%. Maybe future patches can tune the actual bonus calculations for different histories.

closes https://github.com/official-stockfish/S ... /pull/4836

bench: 1185932
see source: https://github.com/official-stockfish/S ... 5b07f963b4

https://abrok.eu/stockfish/
Note: Today we had 8 updates. the latest is one described above.

Thank you very much to the Stockfish team

[Homayoun]

Author: Taras Vuk
Date: Sun Oct 22 16:16:02 2023 +0200
Timestamp: 1697984162

Simplify futilityBase formula

This patch replaces std::min(ss->staticEval, bestValue) with ss->staticEval in the futilityBase formula.
Original idea by Vizvezdenec: https://tests.stockfishchess.org/tests/ ... c21c0d85f3

Passed STC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 116928 W: 29925 L: 29793 D: 57210 Elo +0.39
Ptnml(0-2): 399, 13558, 30446, 13634, 427
https://tests.stockfishchess.org/tests/ ... 2d08d385dd

Passed LTC:
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 50868 W: 12947 L: 12757 D: 25164 Elo +1.30
Ptnml(0-2): 30, 5414, 14355, 5606, 29
https://tests.stockfishchess.org/tests/ ... 2d08d39ba0

closes https://github.com/official-stockfish/S ... /pull/4837

bench: 1241996
see source

https://abrok.eu/stockfish/

[OrgZ]

[Homayoun]

[Homayoun]

Author: Linmiao Xu
Date: Tue Oct 24 17:46:18 2023 +0200
Timestamp: 1698162378

Update 5 search params for pruning at shallow depth

Found by spsa tuning at 45+0.45 with:

```
int fpcEvalOffset = 188;
int fpcLmrDepthMult = 206;
int histDepthMult = -3232;
int histDenom = 5793;
int fpEvalOffset = 115;
int negSeeDepthMultSq = -27;
TUNE(SetRange(0, 394), fpcEvalOffset);
TUNE(SetRange(0, 412), fpcLmrDepthMult);
TUNE(SetRange(-6464, -1616), histDepthMult);
TUNE(SetRange(2896, 11586), histDenom);
TUNE(SetRange(0, 230), fpEvalOffset);
TUNE(SetRange(-54, 0), negSeeDepthMultSq);
```

Passed STC:
https://tests.stockfishchess.org/tests/ ... 58e6c0165d
LLR: 2.98 (-2.94,2.94) <0.00,2.00>
Total: 109056 W: 28025 L: 27599 D: 53432 Elo +1.36
Ptnml(0-2): 357, 12669, 28038, 13119, 345

Passed LTC:
https://tests.stockfishchess.org/tests/ ... 553505175d
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 61290 W: 15316 L: 14941 D: 31033 Elo +2.13
Ptnml(0-2): 34, 6849, 16498, 7236, 28

closes https://github.com/official-stockfish/S ... /pull/4847

bench 1167412
see source : https://github.com/official-stockfish/S ... 343b7fa1bb
https://abrok.eu/stockfish/

[Homayoun]

Author: Disservin
Date: Fri Oct 27 18:35:52 2023 +0200
Timestamp: 1698424552

remove outdated comment

Bench: 1258079
see source
https://abrok.eu/stockfish/