Boden's mate
Also known as Boden's checkmate
Boden's mate is a bishop-pair finish against a king tucked away by castling. The two bishops aim along crossing diagonals that meet on the king's square, while the king's own pieces seal off every flight square. It is most often unlocked by a queen sacrifice that clears the final diagonal.
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How it works
Two bishops sit on diagonals that cross at the king. After Qxc3+ bxc3 the b2 pawn moves away, so the dark-squared bishop on a3 checks the king on c1 along a3-b2-c1. The light-squared bishop on f5 simultaneously controls b1 and c2 down the b1-h7 diagonal. The king's own rook blocks d1, and d2 is covered by the knight on f3, so there is no flight square - mate.
How to spot it
Look for it when the enemy king has castled (usually queenside) and is hemmed in by its own rook and pawns on dark squares. If you own both bishops and one already rakes the squares beside the king, hunt for a way - often a queen sacrifice - to open the second bishop's diagonal. The tell-tale sign is a king with its escape squares blocked by friendly pieces and two bishops converging from opposite colours.
Key ideas
- Two bishops on crossing diagonals converge on one corner
- A queen sacrifice often clears the final diagonal
- The king is trapped by its own rook and pawns
- Most common against a queenside-castled king
- One bishop checks while the other guards the flight squares
Famous example
Named after Samuel Boden, whose game Schulder-Boden, London 1853, featured the famous ...Qxc3+ bxc3 Ba3# finish that gave the pattern its name.