Rook+Knight+Pawn vs Rook+ 2 Pawns

Here is an interesting endgame with Rook, Knight, and Pawn vs Rook and 2 Pawns.  It was won by Yugoslav Grandmaster Boris Ivkov. the winner of the first World Junior Championship in 1951.  He won the championship of Yugoslavia in 1958, 1963, and 1972.