I am pretty sure that is a draw.
More random questions :P.
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Here's what Dvoretsky says about the ending:
"A draw with rook against a rook and a knight is not a hard procedure. Even when your king is pressed to the edge of the board you can usually slip away from mating threats (sometimes with the help of a stalemate)."
Draw unless the side with the lone rook blunders.
Rook vs. Rook and Knight endgame ... draws?