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Black to move · Hold the draw
Your king is in the corner your bishop doesn't cover. Keep it there and move the bishop.
Your king is in the corner your bishop doesn't cover. Keep it there and move the bishop.
A rook against a bishop is usually a draw, if the defender knows where to go. Take your king to a corner of the other colour from your bishop. There the rook can't mate you without the bishop being in the way, and the bishop shuttles around while the king stays put. The losing case is a king trapped in a corner of the bishop's own colour.
Every move is checked with an endgame tablebase, which knows the exact result of every position with up to seven pieces. The computer defends perfectly, and if a move throws the result away, the trainer stops and shows you a better one.