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In chess, the bishop and knight checkmate is the checkmate of a lone king by an opposing king, bishop, and knight. With the stronger side to move, checkmate can be forced in at most thirty-three moves from almost any starting position.
The bishop and knight mate is one of the four basic checkmates and occurs when the king works together with a bishop and knight to force the opponent king to the corner of the board. The bishop and knight endgame can be difficult to master: some positions may require up to 34 moves of perfect play before checkmate can be delivered.
The first position is a checkmate by the bishop, with the black king in the corner. The bishop can be on other squares along the diagonal, the white king and knight have to be on squares that attack g8 and h7. The second position is a checkmate by the knight, with the black king on a side square next to the corner.
A pure mate is a checkmate position such that each of the squares in the king's field is guarded, attacked, or blocked in exactly one way, while the king itself is attacked exactly once. [7] In practice, this means that for each of the squares in the king's field, there is exactly one reason why the mated king cannot be moved to that square to ...
Many variants on the mate are seen, for example a king on e8 checkmated by bishops on g6 and a3, and a king on f1 checkmated by bishops on h3 and b6. Often the mate is immediately preceded by a sacrifice that opens up the diagonal on which the bishop delivers checkmate, and the mate is often a pure mate (as is the case for all but one of the ...
The ending of king and bishop versus king is a trivial draw, in that checkmate is not even possible. Likewise for king and knight versus king. Two knights cannot force checkmate against a lone king (see Two knights endgame). While there is a board position that allows two knights to checkmate a lone king, such requires a careless move by the ...
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The Danvers Opening hinders this by forcing Black (unless they want to sacrifice a pawn) to first defend the e-pawn (usually with 2...Nc6), then 3.Bc4 forces Black to make some compromise to defend against the mate threat; 3...g6 commits Black to fianchettoing the king bishop, 3...Qe7 blocks the bishop, and 3...Qf6 occupies knight's best square.