PDB Server - Keyword Definition
Castling ParadoxA retro term. Typically:
(1) a position in which apparently castling has occurred, but in fact the king and rook walked there. "fake castling".
(2) a position in which actual castling has been concealed, e.g. by the king and rook returning to their starting squares, or conducting fake castling on the other side. "hidden castling".