Rook and bishop against rook is one of the best-known «almost drawn» endings: the extra minor piece is usually not enough to win, though defending it demands precision. Black - the weaker side - is to move here, and with correct play it is a draw (per the tablebases).
White has the king on d6, the bishop on d5 and the rook on f1; Black has the king on d8 and the rook on e7. The defending side has to keep the king in the right corner and screen it properly with the rook - then the stronger side cannot break through.
This ending is the classic proof that extra material does not guarantee a win. The defending side has reliable techniques (the Cochrane defence, for one) that hold the draw - but both the attack and the defence have to be known exactly.
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It is the mating side to move. Find mate in one.
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