Passing by Castling in 960
Sort:
If King on C1 and Queen's Rook on D1, queen side castling is a pass. If King on F1 and King's Rook on E1, King side castling is a pass.
The Knights and Rooks are counted from A file to H file, with the Queen's Pieces occur before the King's Pieces. Bishops are colored, so opposite tint-tone-shade are Queen's Bishop and same tint-tone-shade are King's Bishop.