Suffocation mate

In a suffocation mate, a knight gives the final check while a bishop or queen controls the routes the king could use to escape. The defender's own pieces often occupy other nearby squares.

One exit depends on the queen

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The knight on f7 attacks h8 and delivers the final check.

The knight finishes, the queen seals

The mate combines a knight check, two occupied exits, and one final flight square sealed from a distance. The queen is essential even though it does not give check.

1. The knight on f7 attacks h8 and delivers the final check.
2. The rook on g8 and the pawn on h7 occupy two of the king's exits.
3. The queen on g3 controls g7 along a clear stretch of the g-file and seals the only open flight square.

A knight does not attack the immediately adjacent squares the way a king does. It therefore needs the long-range bishop or queen to close diagonals or exits that would remain free. The king has no space, cannot capture the knight, and cannot block the check because knight attacks cannot be interposed.

Correct identification depends on the supporting piece. If the knight mates because the king is completely surrounded only by its own pieces, the result is the familiar smothered mate. In suffocation mate, the attacking bishop or queen actively helps confine the king.