Arasan 22.3

[jdart]

Arasan 22.3 is available from https://www.arasanchess.org.

Changes in Arasan 22.3:
1) Change re-search logic.
2) Add selfplay utility, to generate NNUE training positions.
3) Changes to book selection logic.
4) Allow piece values to be computed via Texel tuning, re-tune params.
5) Add -mfma if avx2 enabled.
6) Update history and killers on hash cutoff.
7) Add small semi-random factor to draw score (idea from Stockfish).
8) Various search changes to null move, ProbCut, futiliy pruning,
static null pruning.
9) Some cleanup and bug fixes in history code.
10) Simplify qsearch hash code, changes to qsearch forward pruning.
11) Fixes to CMakeLists.txt and VC++ project files.

This version is modestly stronger than 22.2 in my testing.

I have an experimental branch that has implemented a NNUE eval but it is not adequately tested or tuned yet. Meanwhile though since I'd made some positive changes to the search and conventional eval, I'm releasing this version.

[tmokonen]

Hi Jon, thank you for the new release. The Windows engine + book only link didn't seem to work for me, other links were OK.

[Graham Banks]

Hi Jon, thank you for the new release. The Windows engine + book only link didn't seem to work for me, other links were OK.

Same here.

[jdart]

Should be downloadable now.

[toliveanddie76]

chrome wouldn't let me, firefox would.

[Graham Banks]

chrome wouldn't let me, firefox would.

Same. Got it now though.

[Rebel]

Arasan 22.3 is available from https://www.arasanchess.org.

Changes in Arasan 22.3:
1) Change re-search logic.
2) Add selfplay utility, to generate NNUE training positions.
3) Changes to book selection logic.
4) Allow piece values to be computed via Texel tuning, re-tune params.
5) Add -mfma if avx2 enabled.
6) Update history and killers on hash cutoff.
7) Add small semi-random factor to draw score (idea from Stockfish).
8) Various search changes to null move, ProbCut, futiliy pruning,
static null pruning.
9) Some cleanup and bug fixes in history code.
10) Simplify qsearch hash code, changes to qsearch forward pruning.
11) Fixes to CMakeLists.txt and VC++ project files.

This version is modestly stronger than 22.2 in my testing.

I have an experimental branch that has implemented a NNUE eval but it is not adequately tested or tuned yet. Meanwhile though since I'd made some positive changes to the search and conventional eval, I'm releasing this version.

1500 games in progress.

http://rebel13.nl/a/grl.htm

[Damir]

Arasan 22.3 is available from https://www.arasanchess.org.

Changes in Arasan 22.3:
1) Change re-search logic.
2) Add selfplay utility, to generate NNUE training positions.
3) Changes to book selection logic.
4) Allow piece values to be computed via Texel tuning, re-tune params.
5) Add -mfma if avx2 enabled.
6) Update history and killers on hash cutoff.
7) Add small semi-random factor to draw score (idea from Stockfish).
8) Various search changes to null move, ProbCut, futiliy pruning,
static null pruning.
9) Some cleanup and bug fixes in history code.
10) Simplify qsearch hash code, changes to qsearch forward pruning.
11) Fixes to CMakeLists.txt and VC++ project files.

This version is modestly stronger than 22.2 in my testing.

I have an experimental branch that has implemented a NNUE eval but it is not adequately tested or tuned yet. Meanwhile though since I'd made some positive changes to the search and conventional eval, I'm releasing this version.

Hi Jon

Thanks a lot for the new release!