The Arabian Mate: Rook and Knight in the Corner
The Arabian mate is a checkmate in which a rook, protected by a knight, checks a cornered king from an adjacent square while the knight covers the diagonal escape square.
The mating picture
Put the black king on h8, a white rook on g8 and a white knight on f6. The rook gives check from right next to the king and covers g7 along the g-file. The knight does two jobs: it protects the rook on g8, so the king cannot capture it, and it covers h7. The king has three neighboring squares, g8, g7 and h7, and all three are taken.
The same picture works with the rook on h7 instead: the rook checks along the h-file, covers g7 along the seventh rank, and the knight on f6 protects it and also covers g8. Either way, the corner is what makes it work, because a king on the edge has only three squares to begin with.
This is one of the oldest known mating patterns. It was already recorded in the era of shatranj, the ancestor of modern chess, which is where the name comes from.
The typical lead-in
The knight usually arrives first, often with check from f6 or with a fork, driving the king into the corner. A pawn on g7 or f7 that has moved or been exchanged helps, because it gives the knight its outpost on f6. Then the rook enters along the seventh or eighth rank. If a defender blocks on g8, the rook simply captures it and the picture is complete.
Watch for the rook that is already on the seventh rank. A rook on the seventh plus a knight that can reach f6 or f5 is often enough to mate a king in the corner, even with no other attackers.
Why players miss it
Two minor-looking pieces against a king that seems to have plenty of defenders does not feel like a mating attack. But with the king in the corner, a rook and knight cover every square on their own. Before you trade off your knight in an endgame with rooks, check whether it could be part of an Arabian mate. The mates you miss in your own games are the ones most worth reviewing.
How to spot it
- Look for an enemy king in a corner, with few squares around it.
- Ask whether your knight can reach f6 (or f3) to cover h7 and g8.
- Check whether your rook can reach g8, h7 or the seventh rank.
- Make sure the rook is protected by the knight on its mating square.
- If a defender can block on the back rank, see whether your rook can capture it.
Try one
Work it out from the diagram first, then play it on the board or open the solution.
6
2
e
gExample 1
White to move and mate in three.
Show solution
38.Nf6+ Kh8 39.Re8+ Rg8 40.Rxg8#
Nf6+ checks the king and sets up the knight on its ideal square. If the king goes to f8, Re8 is mate at once, so it goes to h8. Re8+ forces Black to block with Rg8, and Rxg8# completes the Arabian mate: the rook on g8 checks the king, the knight on f6 protects it and covers h7, and the rook covers g7.
Position from a real game, via the Lichess puzzle database.