En Passant

Black's king is trapped behind his wall of pawns. If white moves his rook to a8, the king has nowhere to run. In this particular case, black will postpone checkmate for one turn by moving his bishop to c8, but since the bishop won't have anyone to protect him, the rook will capture it on the next turn and the game will be over.

If black had another piece that could move to c8 or a piece that he could move to f8, he would be safe because the blocking piece would be protected from white's rook. Also, if black's knight were on the a8-h1 diagonal, he would be safe because white would not be able to move safely into the checking position at a8.

If it is black's turn, he can avoid checkmate by advancing a pawn so that he can move in behind it after the rook checks, or by moving his king to f8, allowing him to escape to e7.

Labels: back rank mate, chess

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