OpenChess

Author: Muzhen Gaming
Date: Thu May 23 21:37:46 2024 +0200
Timestamp: 1716493066

VVLTC search tune

Parameters were tuned in 2 stages:
1. 127k games at VVLTC:
https://tests.stockfishchess.org/tests/ ... e74c39f52a.
2. 106k games at VVLTC:
https://tests.stockfishchess.org/tests/ ... f886615a9d.

Passed VVLTC 1st sprt:
https://tests.stockfishchess.org/tests/ ... b18de4e410
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 20466 W: 5340 L: 5093 D: 10033 Elo +4.19
Ptnml(0-2): 0, 1796, 6397, 2037, 3

Passed VVLTC 2nd sprt:
https://tests.stockfishchess.org/tests/ ... b18de4e47d
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 15854 W: 4186 L: 3934 D: 7734 Elo +5.52
Ptnml(0-2): 1, 1367, 4938, 1621, 0

closes https://github.com/official-stockfish/S ... /pull/5286

Bench: 1558110

Author: Shahin M. Shahin
Date: Sun May 26 20:32:41 2024 +0200
Timestamp: 1716748361

Remove rootDelta branch

This makes rootDelta logic easier to understand, recalculating the value
where it belongs so removes an unnecessary branch.

Passed non-regression STC:
https://tests.stockfishchess.org/tests/ ... d5e27d8d8e
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 206016 W: 53120 L: 53089 D: 99807 Elo +0.05
Ptnml(0-2): 591, 20928, 59888, 21061, 540

closes https://github.com/official-stockfish/S ... /pull/5289

No functional change

https://abrok.eu/stockfish/

What is it? https://tests.stockfishchess.org/tests/ ... d5e27db0d8
Is this result even possible with so strong hardware or it means that something is now wrong with the scaling?
And of course it is not +1000 Elo but +104 what can be found in the details, but is is still a lot.

Just after I typed that here it appeared on https://abrok.eu/stockfish/ with the explanation.

Author: xoto10
Date: Wed May 29 19:04:57 2024 +0200
Timestamp: 1717002297

Add compensation factor to adjust extra time according to time control

As stockfish nets and search evolve, the existing time control appears
to give too little time at STC, roughly correct at LTC, and too little
at VLTC+.

This change adds an adjustment to the optExtra calculation. This
adjustment is easy to retune and refine, so it should be easier to keep
up-to-date than the more complex calculations used for optConstant and
optScale.

Passed STC 10+0.1:
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 169568 W: 43803 L: 43295 D: 82470 Elo +1.04
Ptnml(0-2): 485, 19679, 44055, 19973, 592
https://tests.stockfishchess.org/tests/ ... d5e27da9fa

Yellow LTC 60+0.6:
LLR: -2.94 (-2.94,2.94) <0.50,2.50>
Total: 209970 W: 53087 L: 52914 D: 103969 Elo +0.29
Ptnml(0-2): 91, 19652, 65314, 19849, 79
https://tests.stockfishchess.org/tests/ ... d5e27daaa0

Passed VLTC 180+1.8 :
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 85618 W: 21735 L: 21342 D: 42541 Elo +1.59
Ptnml(0-2): 15, 8267, 25848, 8668, 11
https://tests.stockfishchess.org/tests/ ... d5e27db95f

closes https://github.com/official-stockfish/S ... /pull/5297

Bench: 1212167
https://abrok.eu/stockfish/

Author: Viren6
Date: Thu May 30 14:34:24 2024 +0200
Timestamp: 1717072464

Add extension condition to cutoffCnt

Decrease cutoffCnt increment by 1 if extension is 2 or greater.

Passed STC:
https://tests.stockfishchess.org/tests/ ... 8cefa8d34d
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 99200 W: 25703 L: 25297 D: 48200 Elo +1.42
Ptnml(0-2): 253, 11660, 25390, 12022, 275

Passed LTC:
https://tests.stockfishchess.org/tests/ ... 8cefa8d411
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 124530 W: 31659 L: 31161 D: 61710 Elo +1.39
Ptnml(0-2): 58, 13578, 34489, 14088, 52

closes https://github.com/official-stockfish/S ... /pull/5310

bench 1623228


https://abrok.eu/stockfish/

Linux compilations only at abrok.

For others see here:
https://github.com/official-stockfish/S ... 0-a77a895c

Author: Joost VandeVondele
Date: Thu May 30 23:07:25 2024 +0200
Timestamp: 1717103245

Fix cross from Linux to Windows

specifies Windows 7 required

https://learn.microsoft.com/en-us/cpp/p ... w=msvc-170

closes https://github.com/official-stockfish/S ... /pull/5319

No functional change

https://abrok.eu/stockfish/

Hi, has the SlowMover parameter been removed?

Homayoun wrote: Mon May 27, 2024 4:06 pm Author: Shahin M. Shahin
Date: Sun May 26 20:32:41 2024 +0200
Timestamp: 1716748361

Remove rootDelta branch

This makes rootDelta logic easier to understand, recalculating the value
where it belongs so removes an unnecessary branch.

Passed non-regression STC:
https://tests.stockfishchess.org/tests/ ... d5e27d8d8e
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 206016 W: 53120 L: 53089 D: 99807 Elo +0.05
Ptnml(0-2): 591, 20928, 59888, 21061, 540

closes https://github.com/official-stockfish/S ... /pull/5289

No functional change

https://abrok.eu/stockfish/

From Stefan Pohl:

Wow ! This is not good...
”Latest Website-News (2024/06/02): Testrun of Stockfish 240526 finished: 0 Celo to Stockfish 240519, and sadly a measureable regression in EAS-scoring (nearly -20000 EAS points !)”

Thank you Stefan !