Rook against bishop with no pawns is almost always drawn: the exchange is not enough to win if the defending side plays accurately. White to move here, and the position is drawn (per the tablebases).
White has the king on h6 and the rook on a7 against the king on h8 and the bishop on b3. The defence is simple: the weaker side keeps the king in the corner and does not leave the bishop where it can be attacked - a lone rook cannot mate here.
The danger for the defender is being trapped in the wrong corner, where mating motifs appear; but with accurate play this is a reliable 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.
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