Checkmate
Two bishops on intersecting diagonals checkmate a king obstructed by its own pieces.
Two bishops slice across the board on intersecting diagonals to checkmate the king. One bishop delivers the check while the other cuts off the king's escape squares, usually taking advantage of friendly pieces that block the king's remaining flight paths.
Boden’s Mate was named after Samuel Boden, who famously played the pattern in an 1853 game. It is a recurring tactical danger for players who castle queenside and rely too heavily on the c-pawn for defense.
See also:Sacrifice·Discovered attack