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lynx-chess / Lynx

Chess Engine, written in C#
https://lichess.org/@/Lynx_BOT
MIT License
39 stars 3 forks source link

⚖️ Bucketed `TaperedEvaluationTerm` arrays (w/ custom 23 buckets) #936

Closed eduherminio closed 4 weeks ago

eduherminio commented 1 month ago

See also https://github.com/lynx-chess/Lynx/pull/917, the bucketization attempt of single TaperedEvaluationTerm.

Tuned at 37k epoch

Test  | eval/psqt-TaperedEvaluationTermArray-custom23buckets
Elo   | -2.23 +- 3.41 (95%)
SPRT  | 8.0+0.08s Threads=1 Hash=32MB
LLR   | -2.29 (-2.25, 2.89) [0.00, 3.00]
Games | 19816: +5690 -5817 =8309
Penta | [654, 2413, 3864, 2360, 617]
https://openbench.lynx-chess.com/test/637/

After enabling mobility values addition to the piece values, still kinda neutral

Test  | eval/psqt-TaperedEvaluationTermArray-custom23buckets
Elo   | -1.01 +- 4.05 (95%)
SPRT  | 8.0+0.08s Threads=1 Hash=32MB
LLR   | -2.25 (-2.25, 2.89) [0.00, 5.00]
Games | 13822: +3928 -3968 =5926
Penta | [421, 1693, 2744, 1611, 442]
https://openbench.lynx-chess.com/test/640/