Pillsbury's mate
Also known as Pillsbury's checkmate
A rook and a long-diagonal bishop gang up on a fianchettoed king. The rook checks along the back rank while the bishop quietly covers the two diagonal escape squares, g7 and h8. Boxed in by its own f- and h-pawns, the king cannot move, and the lone rook check is checkmate.
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How it works
Black's king sits on g8 behind pawns on f7 and h7, but the g-pawn is gone. The bishop on b2 rakes the a1-h8 diagonal, controlling both g7 and h8, the only squares the king could flee to. With those covered and f7/h7 occupied by its own pawns, the king is frozen. The rook then lands on the 8th rank (Rd8#) and checks from the side; the king has no legal square and nothing can block or capture the rook, so it is mate. Remove the bishop and Rd8+ simply allows Kh8.
How to spot it
Look for it whenever your opponent has fianchettoed (king on g8/g7 behind a g-pawn) and that g-pawn has been traded off or pushed, leaving holes on g7 and h8. If you own a bishop on the long a1-h8 diagonal and can land a rook on the open back rank or g-file, the two pieces may already deliver mate. The tell-tale sign: the enemy king is walled in by its own f7 and h7 pawns, so it only needs the diagonal squares taken away.
Key ideas
- The bishop on the long a1-h8 diagonal covers both g7 and h8, the king's only flights
- The rook delivers the actual check along an open back rank or file
- The king is trapped by its own f7 and h7 pawns, with no luft and no escape
- It targets a fianchetto whose g-pawn has vanished, leaving dark-square holes
- Without the diagonal bishop the back-rank check is not mate; the bishop makes it work
- Trading off or deflecting the g-pawn is often the preparation that sets it up
Famous example
Named after the American master Harry Nelson Pillsbury (1872-1906), one of the strongest attacking players of the 1890s, famous for his triumph at Hastings 1895. The pattern reflects his fondness for rook-and-bishop batteries aimed at a weakened fianchetto.