Chess 960 PGN import castling error

[boombox2000]

Trowing an error "Invalid move in PGN: O-O !" when importing a chess960 game with legal castling moves. This game iimports without issue to sites like Lichess.

Sample PGN:

[FEN "bqnrnkrb/pppppppp/8/8/8/8/PPPPPPPP/BQNRNKRB w KQkq - 0 1"]

1. b3 c5 2. Nf3 d5 3. d4 b6 4. O-O Nf6 5. c4 dxc4 6. dxc5 Rxd1 7. Rxd1 Bxf3 8. Bxf6 gxf6 9. Qxh7 Qc7 10. exf3 bxc5 11. bxc4 Nd6 12. Qd3 f5 13. f4 Qa5 14. g3 Bd4 15. Rd2 Ne4 16. Bxe4 fxe4 17. Qe2 Bc3 18. Nb3 Qc7 19. Rd5 Bb4 20. Qxe4 e6 21. Qe5 Qb6 22. Qd6+ Ke8 23. Qd7+ Kf8 24. Qc8+ Ke7 25. Rd7+ Kf6 26. Qxg8

[GuillaumeSD]

Hi @boombox2000
Thanks for reporting this. This issue has been identified, we are waiting for chess960 support in the chess.js package this project uses. Once that done we will be able to fully support chess960 in chesskit. More info here : jhlywa/chess.js#493

[deverac]

@GuillaumeSD
What does the 'Variant' PGN Header specify?

The PGN below uses the same info provided by @boombox2000, but also includes the Variant PGN Header. and it loads without issue in chess.js. (Note: This only works on development versions of chess.js that provide Chess960 support.)

[Variant "Chess960"]
[FEN "bqnrnkrb/pppppppp/8/8/8/8/PPPPPPPP/BQNRNKRB w KQkq - 0 1"]
1. b3 c5 2. Nf3 d5 3. d4 b6 4. O-O Nf6 5. c4 dxc4 6. dxc5 Rxd1 7. Rxd1 Bxf3 8. Bxf6 gxf6 9. Qxh7 Qc7 10. exf3 bxc5 11. bxc4 Nd6 12. Qd3 f5 13. f4 Qa5 14. g3 Bd4 15. Rd2 Ne4 16. Bxe4 fxe4 17. Qe2 Bc3 18. Nb3 Qc7 19. Rd5 Bb4 20. Qxe4 e6 21. Qe5 Qb6 22. Qd6+ Ke8 23. Qd7+ Kf8 24. Qc8+ Ke7 25. Rd7+ Kf6 26. Qxg8

Either Chess960 or Fischerandom may be specified as the Variant.

I suspect that the PGN that boombox2000 is using does not specify the Variant (or perhaps uses a different variant name), but LiChess recognizes the starting position (or variant name) as a Chess960 position and automatically enables Chess960 support.

[GuillaumeSD]

@deverac I can't use development versions in this project, only stable official releases.