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official-stockfish / Stockfish

A free and strong UCI chess engine
https://stockfishchess.org/
GNU General Public License v3.0
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Cornered Bishop Problem for NNUE in FRC #3229

Closed SFisGOD closed 3 years ago

SFisGOD commented 3 years ago

Stockfish lost in an FRC game against Allie https://tcec-chess.com/#div=frc2fl&game=1&season=19

The problem is the cornered bishop on a1. Stockfish classical has the CorneredBishop penalty to deal with this problem.

I browsed in https://github.com/official-stockfish/books and there is no FRC book. It would be nice to have an FRC book as well @noobpwnftw for FRC testing

Also, almost lost against Minic here https://tcec-chess.com/#div=frc2la&game=13&season=19 Stockfish would have lost this game against a stronger opponent.

vondele commented 3 years ago

the classical eval has a corned bishop term added explicitly (as the only FRC term, IIRC).

joergoster commented 3 years ago

@SFisGOD See https://github.com/enedene/chess960-opening-book

SFisGOD commented 3 years ago

@vondele It would be nice to upload an FRC book to https://github.com/official-stockfish/books

vondele commented 3 years ago

@SFisGOD not so easy, since fishtest can't play FRC, needs changes to the framework to instruct cutechess to play variants

Nordlandia commented 3 years ago

This occurred in one of my FRC games. In the end Stockfish was essentially piece down and quickly lost. Its visually comparable to the snowball effect. By the way. The standard initial setup is one possible configuration within 960. So i would not call FRC a variant because Chess960 encompasses Chess.

vondele commented 3 years ago

@Nordlandia it needs -variant fischerandom to be passed to cutechess (for move validation and whatever). So, right now it doesn't work out of the box. Also, consumers of fishtest games would need changes, since they don't expect variants. I would work out-of-the-box if we would remove all castling rights and just use the positions.

Mr-Twave commented 3 years ago

Has this issue has been recently addressed by a particular patch?

vondele commented 3 years ago

yes, at least practically, a term has been added to the NNUE eval that deals with this problem (gained about 40Elo for FRC). NNUE training is still not of on FRC games.

vondele commented 3 years ago

so, this is essentially fixed with the added term, will close the issue.