[Event "Leipzig Olympiad"] [Site "?"] [Round "0"] [White "Letelier"] [Black "Fischer"] [Result "0-1"] [ECO "E70"] [Opening "King's Indian: 4.e4 O-O 5.e5"] 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 O-O 5. e5 {This advance has disappeared completely from the tournament scene. White is overextending his center, and Black will be able to strike back easily.} 5... Ne8 6. f4 d6 7. Be3 c5 { Black moves quickly to undermine White's center.} 8. dxc5 Nc6 9. cxd6 exd6 10. Ne4 Bf5 11. Ng3 {11.Nxd6 Nxd6 12.exd6 Bxb2 13.Nf3 Re8!} 11... Be6 12. Nf3 Qc7 13. Qb1 {White's queenside ambitions are unrealistic, but it was time for the queen to leave the d-file anyway. The dual purpose is to support the advance of the f-pawn, but this has a tactical flaw.} 13... dxe5 14. f5 e4 15. fxe6 exf3 16. gxf3 f5 {This is much stronger than grabbing the weak pawn at e6. Black has now secured the initiative.} 17. f4 Nf6 18. Be2 Rfe8 19. Kf2 Rxe6 20. Re1 Rae8 {The pressure on the e-file and the active position of the minor pieces give Black a clear, and perhaps decisive advantage.} 21. Bf3 Rxe3 22. Rxe3 Rxe3 23. Kxe3 {Now Fischer provides an aesthetic conclusion to the game. Can you figure it out?} 23... Qxf4+ { and White resigned, faced with checkmate. For example:} 24. Kf2 {24.Kxf4 Bh6++} 24... Ng4+ 25. Kg2 Ne3+ 26. Kf2 Nd4 27. Qh1 Ng4+ 28. Kf1 Nxf3 { and the end comes quickly.} 0-1