For experienced players
This is usually one of the first theoretical endgames a player learns, but in practical play it often appears as a middlegame attacking theme when heavy pieces invade an open file or rank.
See also:Back-Rank Mate
Checkmate
Ladder Mate
Two heavy pieces — rooks or a queen-and-rook pair — work together to push the enemy king to the edge of the board, one rank at a time.
Starting position
Two rooks or queens work together to push the enemy king to the edge of the board by cutting off adjacent ranks or files. They take turns delivering checks and restricting escape squares, walking the king down like climbing the rungs of a ladder.
Starting position
Positions and move sequences for checkmates/endgames in Ladder Mate
Canonical
Starting Position (FEN): 8/7k/1R6/8/8/8/R4K2/8 w - - 0 1
Move Sequence: Ra7+ Kg8 Rb8#
Explanation: Two rooks or queens work together to push the enemy king to the edge of the board by cutting off adjacent ranks or files. They take turns delivering checks and restricting escape squares, walking the king down like climbing the rungs of a ladder.
On the a-file
Starting Position (FEN): 1R6/8/8/8/8/k7/6K1/2R5 w - - 0 1
Move Sequence: Ra1#
Explanation: The pattern works vertically just as well as horizontally to force the king to the edge.
With queen and rook
Starting Position (FEN): 3k4/1Q6/8/8/8/8/7K/R7 w - - 0 1
Move Sequence: Ra8#
Explanation: A queen can substitute for one of the rooks to perform the exact same leapfrogging action.