#define F_ATOMIC_CAPTURE 128 /* capturing piece explodes, destroying itself\r
and all non-pawns on adjacent squares; \r
destroying your own king is illegal */\r
+#define F_FRC_TYPE_CASTLING 256 /* generate castlings as captures of own Rook */\r
\r
/* Special epfile values. [HGM] positive values are non-reversible moves! */\r
#define EP_NONE (-4) /* [HGM] Tricky! order matters: */\r