[Event "1 Prize Lelo {m}"]  [Site "?"]  [Date "1951.??.??"]  [Round "?"]  [White "Korolkov V"]  [Black "White wins"]  [Result "*"]  [SetUp "1"]  [FEN "2b4k/8/5Pr1/5N2/8/8/8/K1B5 w - - 0 1"]  [PlyCount "23"]  [EventDate "1951.??.??"]   1. f7 {[pgndiagram] The first move is quite obvious} (1. Bb2 $2 Rxf6) 1... Ra6+  (1... Rf6 2. Bb2) (1... Rg8 2. fxg8=Q+ Kxg8 3. Ne7+) 2. Ba3 $1 {Diverting the  rook} (2. Kb1 $2 Bxf5+) 2... Rxa3+ 3. Kb2 Ra2+ 4. Kc1 $1 {[pgndiagram] The  only move to win} (4. Kc3 Rc2+ {And White can't hide. If he steps on the  d-file, the rook goes back to d8} 5. Kb4 Rb2+ 6. Kc5 Rc2+ 7. Kd6 Rd2+ 8. Ke5 (  8. Ke7 {[pgndiagram]} Rd7+ {Is important nuance. The pawn falls}) 8... Rd8)  4... Ra1+ 5. Kd2 (5. Kb2 $2 Rb1+ 6. Kc3 Rb3+ 7. Kd4 Rd3+ 8. Kxd3 Bxf5+) 5...  Ra2+ 6. Ke3 Ra3+ 7. Kf4 Ra4+ 8. Kg5 Rg4+ 9. Kh6 $1 {[pgndiagram] A fine finale}  (9. Kxg4 $2 Bxf5+ 10. Kxf5 Kg7 11. Ke6 Kf8 12. Kf6) (9. Kh5 $2 Rg8 10. Ne7 Rf8  11. Ng6+ Kg7) 9... Rg8 (9... Rg6+ 10. Kxg6 Bxf5+ 11. Kh6) 10. Ne7 $1 {White  mates in two} Be6 11. fxg8=Q+ $1 (11. Ng6+ $2 Rxg6+ 12. Kxg6 Bxf7+) 11... Bxg8  12. Ng6# *