OpenChess

Author: Shawn Xu
Date: Wed Apr 2 17:53:05 2025 +0200
Timestamp: 1743609185

Introduce TT Move History Double Extensions

Passed VVLTC w/ STC bounds:
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 74918 W: 19436 L: 19120 D: 36362 Elo +1.47
Ptnml(0-2): 6, 6890, 23354, 7200, 9
https://tests.stockfishchess.org/tests/ ... 3457d878bb

Passed VVLTC w/ LTC bounds:
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 111706 W: 29050 L: 28619 D: 54037 Elo +1.34
Ptnml(0-2): 13, 10218, 34959, 10651, 12
https://tests.stockfishchess.org/tests/ ... b4a2dfd36b

STC Elo Estimate:
Elo: 1.26 ± 2.0 (95%) LOS: 88.8%
Total: 30000 W: 7855 L: 7746 D: 14399 Elo +1.26
Ptnml(0-2): 104, 3531, 7630, 3622, 113
nElo: 2.44 ± 3.9 (95%) PairsRatio: 1.03
https://tests.stockfishchess.org/tests/ ... 8afdc44b99

closes https://github.com/official-stockfish/S ... /pull/5961

Bench: 1887897

https://abrok.eu/stockfish/

Author: Daniel Monroe
Date: Fri Apr 18 14:32:26 2025 +0200
Timestamp: 1744979546

Skip 5th continuation history

Passed simplification STC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 70208 W: 18098 L: 17914 D: 34196 Elo +0.91
Ptnml(0-2): 199, 8300, 17907, 8514, 184
https://tests.stockfishchess.org/tests/ ... 8afdc451cb

Passed simplification LTC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 485004 W: 122703 L: 122956 D: 239345 Elo -0.18
Ptnml(0-2): 288, 53162, 135805, 53009, 238
https://tests.stockfishchess.org/tests/ ... 8afdc452ea

closes https://github.com/official-stockfish/S ... /pull/5992

Bench: 1715901
https://abrok.eu/stockfish/

Author: FauziAkram
Date: Sun Apr 27 20:47:47 2025 +0200
Timestamp: 1745779667

VVLTC Tune

Passed VVLTC with LTC bounds:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 12800 W: 3432 L: 3184 D: 6184 Elo +6.73
Ptnml(0-2): 1, 1098, 3954, 1346, 1
https://tests.stockfishchess.org/tests/ ... 2d74b15d5e

Passed VVLTC with STC bounds:
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 14402 W: 3865 L: 3625 D: 6912 Elo +5.79
Ptnml(0-2): 0, 1236, 4490, 1474, 1
https://tests.stockfishchess.org/tests/ ... 2d74b15da6

Passed VVLTC third test (removing an unrelated change):
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 25584 W: 6670 L: 6398 D: 12516 Elo +3.69
Ptnml(0-2): 4, 2290, 7932, 2562, 4
https://tests.stockfishchess.org/tests/ ... 2d74b15def

closes https://github.com/official-stockfish/S ... /pull/6036

Bench: 1857323

https://abrok.eu/stockfish/

Author: FauziAkram
Date: Tue May 13 20:47:50 2025 +0200
Timestamp: 1747162070

Introducing a depth component to the penalty.

Passed STC:
LLR: 2.97 (-2.94,2.94) <0.00,2.00>
Total: 31648 W: 8358 L: 8050 D: 15240 Elo +3.38
Ptnml(0-2): 78, 3596, 8182, 3876, 92
https://tests.stockfishchess.org/tests/ ... 2d74b165a9

Passed LTC:
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 177720 W: 45524 L: 44920 D: 87276 Elo +1.18
Ptnml(0-2): 91, 19130, 49813, 19736, 90
https://tests.stockfishchess.org/tests/ ... 2d74b166ee

closes https://github.com/official-stockfish/S ... /pull/6060

Bench: 2251724

https://abrok.eu/stockfish/?

Author: Shawn Xu
Date: Mon May 19 20:49:28 2025 +0200
Timestamp: 1747680568

Simplify TT Replacement Strategy

Passed Non-regression STC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 50528 W: 13160 L: 12958 D: 24410 Elo +1.39
Ptnml(0-2): 132, 5681, 13439, 5877, 135
https://tests.stockfishchess.org/tests/ ... 4154f9a785

Passed Non-regression STC w/ High Hash Pressure:
LLR: 2.98 (-2.94,2.94) <-1.75,0.25>
Total: 30048 W: 7849 L: 7621 D: 14578 Elo +2.64
Ptnml(0-2): 75, 3390, 7884, 3582, 93
https://tests.stockfishchess.org/tests/ ... 4154f9a7ae

Passed Non-regression LTC w/ High Hash Pressure:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 17610 W: 4584 L: 4362 D: 8664 Elo +4.38
Ptnml(0-2): 7, 1799, 4974, 2015, 10
https://tests.stockfishchess.org/tests/ ... 4154f9a8c8

closes https://github.com/official-stockfish/S ... /pull/6079

Bench: 2422771
https://abrok.eu/stockfish/?

Author: ppigazzini
Date: Wed May 21 07:29:57 2025 +0200
Timestamp: 1747805397

ci: add tests and artifacts for windows-11-arm

integrate armv8 and armv8-dotprod builds on windows-11-arm in ci, creating the corresponding artifacts.
Correct Makefile to drop warnings when providing a CXX, add MINGW ARM64 to get_native_properties.sh

fixes https://github.com/official-stockfish/S ... ssues/5640
closes https://github.com/official-stockfish/S ... /pull/6078

No functional change

Author: ppigazzini
Date: Wed May 21 07:29:57 2025 +0200
Timestamp: 1747805397

ci: add tests and artifacts for windows-11-arm

integrate armv8 and armv8-dotprod builds on windows-11-arm in ci, creating the corresponding artifacts.
Correct Makefile to drop warnings when providing a CXX, add MINGW ARM64 to get_native_properties.sh

fixes https://github.com/official-stockfish/S ... ssues/5640
closes https://github.com/official-stockfish/S ... /pull/6078

No functional change

Thank you for this Thread.

You can also find the last updates https://abrok.eu/stockfish/

Regards.

Author: FauziAkram
Date: Sun May 25 21:31:12 2025 +0200
Timestamp: 1748201472

Simplify Double Margin Formula

Passed STC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 267296 W: 69214 L: 69248 D: 128834 Elo -0.04
Ptnml(0-2): 760, 31511, 69141, 31475, 761
https://tests.stockfishchess.org/tests/ ... 4154f9b01e

Passed LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 67872 W: 17460 L: 17289 D: 33123 Elo +0.88
Ptnml(0-2): 25, 7238, 19243, 7401, 29
https://tests.stockfishchess.org/tests/ ... 4154f9b5ae

Passed VLTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 118000 W: 30337 L: 30222 D: 57441 Elo +0.34
Ptnml(0-2): 15, 11783, 35289, 11898, 15
https://tests.stockfishchess.org/tests/ ... 4154f9ba46

closes https://github.com/official-stockfish/S ... /pull/6097

https://abrok.eu/stockfish/?

Author: Shawn Xu
Date: Mon Jun 2 22:12:37 2025 +0200
Timestamp: 1748895157

remove non-functional else

since we break out of the loop in the other branch

closes https://github.com/official-stockfish/S ... /pull/6116

no functional change
https://abrok.eu/stockfish/?