Mate with two bishops is one of the basic minor-piece mates. Working on adjacent diagonals, the two bishops take every square away from the king while their own king helps press him into the corner. Unlike a single bishop, the pair covers squares of both colours, which is what makes the mate possible.
Here the black king has been driven into the corner on h8. The bishop on f6 holds g7 and h8 along the diagonal, the second bishop on b3 rakes the long diagonal and covers g8, and the white king on g6 takes away h7 and g7. The king has nowhere to go - mate.
To deliver mate with two bishops the king is pushed methodically into a corner: the bishops build a wall on the diagonals while their own king comes right up. It is one of the compulsory endgame mates and worth being able to deliver with confidence.
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It is the mating side to move. Find mate in one.
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