[Event "2 Prize Shakhmaty v SSSR#19 {m}"]  [Site "White to play and win"]  [Date "19.??.??"]  [Round "2 Prize Shakhmaty v SSSR#19 {m}"]  [White "Gurgenidze D, Kalandadze V"]  [Black "White to play and win"]  [Result "*"]  [SetUp "1"]  [FEN "8/p3P3/rp6/kp6/1p4PK/1P6/1P5p/4r2R w - - 0 1"]  [PlyCount "41"]  [EventDate "19.??.??"]   1. e8=N $1 {[pgndiagram] The first point. White underpromotes in order to be  able to threaten mate with the knight and with the rook} (1. e8=Q $143 Rxh1 $11  {And White can't win} 2. Kg3 Re1 3. Qxe1 h1=Q 4. Qxh1) 1... Rg1 $1 {The only  move. Black threatens to draw with the rampaging rook idea} (1... Rxh1 $144 2.  Nd6 $18 {And mate on b7 next move}) 2. Kh5 $1 {The second point. White removes  the king from the potential check} (2. Nd6 Rxg4+ {Draws easily}) 2... Rf1 3. g5  $1 {[pgndiagram] The third point. With the help of this "zig-zag" maneovre  with the king and pawn, White manages to reach the 8th rank and promote his  pawn.} (3. Nd6 Rf5+ {Is another draw}) 3... Rg1 {Black has to threaten with  the rook again} 4. Kh6 {The theme continues} Rf1 5. g6 Rg1 6. Kh7 Rf1 7. g7 Rg1  8. Kh8 Rf1 9. g8=Q Rg1 {[pgndiagram] But now we reach another critical moment.  What next? The winning idea consists of building a "bridge" with the queen on  g3 in order to bring the king on g2. At that moment, Black's rook won't be  able to reach g1, and White's knight will be able to threaten mate.} 10. Qg7 $1  {White starts the return journey} Rf1 11. Kh7 Rg1 12. Qg6 Rf1 13. Kh6 Rg1 14.  Qg5 (14. Qg3 {Would be premature} Rf1 15. Kh5 Rf5+ 16. Kh4 Rh5+ {[pgndiagram]  White has to bring his queen one step a time}) 14... Rf1 (14... Re1 15. Kh5) (  14... Rd1 15. Kh5) 15. Kh5 Rg1 16. Qg4 Rf1 17. Kh4 {[pgndiagram] The final  point. White heads for the g2 square} (17. Nd6 $143 {Would only lead to a draw}  Rf5+ 18. Kh4 Rh5+ 19. Kg3 Rh3+ {The key point. With the pawn on h2, Black's  rook is unable to give check on h2. In this variation, the h3 square is free  for the rook to give a check} 20. Kf2 Rf3+ 21. Ke1 {White can't avoid a draw}  Re3+ (21... Rf1+ $143 22. Rxf1 h1=Q 23. Nc4+ $18) 22. Kd1 Rd3+ 23. Kc1 Rxd6 $1  $11) 17... Rg1 18. Qg3 Rf1 (18... Rd1 19. Nd6 {Doesn't help, beacause of the  mate on a1} Rxd6 20. Ra1#) 19. Nd6 $1 Rf4+ 20. Kh3 Rh4+ 21. Kg2 $18 {  [pgndiagram] And Nb7 or Ra1 mates next move. Black is unable to parry both  threates. Simply sensational idea and it's execution.} *