| OOO | Castle queenside, in chess notation |
| MOVES | They're written in chess notation |
| BLUNDER | Bad move indicated by "??" in chess notation |
| AONE | Square for a white rook, in chess notation |
| MATE | What "#" means in chess notation |
| ATWO | Starting position of the queen's rook pawn, in chess notation |
| BPXR | Certain capture, in old chess notation |
| KNIGHT | Piece marked as N in modern chess notation (6) |
| MOVE | Queenside castle, e.g. |
| QUEENSIDE | Uncommon place to castle, in chess |
| ROOKS | Castle-shaped pieces in chess |
| ROOK | Castle tower in Chess |
| KNIGHTSMOVE | (In the above diagram, as in chess) from square 5 to 8, 11 to 13, or 17 to 21 (7,4) |
| ENPRISE | French term used in chess to describe a piece or pawn that is in a position to be captured/taken (2, |
| CASTLES | Old or informal name for rooks in chess; or, a general name for fortresses such as those constructed in Wales under the direction of Edward I (7) |
| GAMBIT | In chess, an opening move in which a chessman is sacrificed to secure an advantageous position |
| GAME | Grand Master takes a castle at last in chess? (4) |
| STALEMATE | Position in chess that inevitably results in a drawn game |
| KNIGHTS | Pieces in chess that move in an L-shape (7) |
| ATTACKS | Threats to capture an opponent's pieces in chess; or, offensive moves in fencing, cycling, rugby, hockey and other sports (7) |
