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Yes, Fairy-SF currently only understands the normal castling notation in the CECP/xboard protocol, not the FRC notation. The CECP documentation states that
Castlings are indicated as the King move, e.g. e1g1 or e8c8, except for Fischer castling, which is O-O or O-O-O (oh, not zero!).
In UCI that all works fine, therefore other GUIs have no issue.
In Winboard pick New Variant ... CRC
Psste this position: br2q1kr1n/ppp3pppp/4pp3c/1n1p6/1Q3P4/1P1P4P1/PBP1P1PPCb/1RNB2KR1N b HBhb - 1 1
Set Fairy-Stockfish 14 to play White.
Try to castle manually by first clicking the King, and then the Rook.
I get this error:
Illegal move "O-O" (rejected by first chess program)
The same move tested in Cute Chess works fine.
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