Endings with opposite-coloured bishops are famous for being drawn: the bishops travel on different-coloured squares and never meet, so the defending side often saves the game a pawn - sometimes two - down. White to move.
Here White is two pawns up (c6 and e6) with a bishop, but Black's bishop on d6 holds the position: it blockades the pawns and controls the queening squares of its own colour. Getting the pawns onto the other bishop's squares proves impossible.
The rule is simple: with opposite-coloured bishops, material counts for less than the placement of the pawns and the blockade. That matters both when playing for a win (extra pawns may not help) and when defending (there is an excellent chance of a draw).
Drag a piece onto the board, or click a piece and then click the squares. The cross beside the pieces sweeps every piece of that colour off the board, and a single piece can be dragged off the edge.
The pieces will be arranged into the chosen pattern.
It is the mating side to move. Find mate in one.
Openings, endgame positions and breakthrough studies - the set-up appears on the board.
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