The ending with this material balance would usually be drawn because "all" the defender has to do is to exchange his knight for the pawn, when the resulting R+N versus R position is almost invariably drawn. Sometimes it is easier said than done. White has a rook's pawn (usually problematic for a knight) and it's well advanced; even so Black should have drawn this position, which arose after White's 60th move.
Soon after Black's fatal error, another interesting situation arose when, at move 70, White failed to find the most efficient win and ended up in a Queen versus Rook ending (still winning). Probably because of the clock, Black failed to put up much resistance in that phase but he did not have an optimal defensive position to begin with.
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Yuri Vovk (2632) - Yannick Gozzoli (2567)
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