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Pillsbury’s mate is the mirror image of Morphy’s mate. Both use a rook and a bishop against a castled king, but here the rook gives the check and the bishop quietly guards the corner. The pattern is named after Harry Nelson Pillsbury, the American master known for sharp attacking play.
It typically appears after the pawn in front of a castled king has gone, leaving the king exposed on an open file with its own pieces packed around it.
The finished pattern
With Black’s king on g8, the standard picture looks like this:
- Black’s king is on g8, with its own rook on f8 and pawns on f7 and h7.
- White’s bishop sits on the long a1-h8 diagonal, for example on b2, with g7 empty so it covers g7 and h8.
- White’s rook gives check along the g-file, for example from g1.
The king’s options are all gone. f8, f7 and h7 are blocked by Black’s own pieces. g7 is covered twice, by the rook and the bishop. h8 is covered by the bishop. With nothing to interpose on the g-file, it is mate.
Compare this with Morphy’s mate: there the king is on h8 and the bishop checks while the rook covers. If you learn the two together, you will recognise both much faster.
How you get there
The g7 pawn is the main obstacle, so most Pillsbury attacks begin by removing it. Typical ways:
- A sacrifice on g7 with the bishop, rook or queen that rips open the g-file.
- Discovered checks from the long-diagonal bishop that push the king between g8 and h8 until a rook can check from lower down the g-file, with g7 empty.
- Driving the king from h8 back to g8, after which a rook check on the g-file finishes.
- Opening the long diagonal by pushing a pawn to e5 or d4 and then exchanging it, so the bishop suddenly sees h8.
A typical clue is an attacker with a rook on the g-file, a bishop pointing at h8, and a defender whose rook on f8 is still boxing in its own king.
Where it goes wrong
The attacker’s most common mistake is checking on the g-file while the long diagonal is blocked. A black pawn on f6 or a piece on e5 means h8 is free, and the king simply walks into the corner. Check the bishop’s line square by square before you commit.
Another slip is forgetting about h7. If the defender has already played …h6, the king can escape to h7 and the mate disappears. In that case you may need a different idea, such as bringing the queen.
Defenders tend to lose to this pattern by keeping the rook on f8 too long. That rook blocks the king’s best escape route. Moving it, or keeping a piece that can interpose on the g-file, often stops the mate. Making a small pawn move to give the king air before the g-file opens is also a strong prophylactic choice.
Tips for your training
- When a castled king has lost the g-pawn, look at the g-file and the long diagonal together, not separately.
- Ask yourself which piece should give check. If the king is on g8, the rook usually checks; if it’s on h8, the bishop often does.
- Count escape squares, not attackers. Three own pieces around the king are the defender’s biggest weakness here.
Rook and bishop teamwork appears in many patterns, and this one pays off quickly in real games.
