[Event "Havana"] [Site "?"] [Round "0"] [White "Pietzsch"] [Black "Fischer"] [Result "0-1"] [ECO "A05"] [Opening "Reti: 1...Nf6"] 1. Nf3 Nf6 2. c4 g6 3. g3 Bg7 4. Bg2 O-O 5. O-O d6 6. d4 Nbd7 7. Nc3 e5 8. dxe5 dxe5 9. Qc2 c6 10. Rd1 Qe7 11. Ng5 { This just loses time. The night can't stay on e4, so it should stick to f3.} 11... Ne8 {Now if either knight moves to e4, then ...f5 is strong, so Pietzsch tries something else, but he soon finds the position opening up to his disadvantage.} 12. e4 Nc7 {Eyeing the new weakness on d4.} 13. Be3 { The bishop is now a target for f7-f5-f4.} 13... h6 14. Nf3 Ne6 15. Rab1 { Hoping to get something on the queenside, but this is too slow. Black gets the initiative right away on the kingside, since he can gain time attacking White's pieces.} 15... f5 16. Nh4 {Since White can't follow up with f4 due to the weakness of the f file, this just misplaces another piece. Pietzsch hopes to get light square play, but just misplaces another piece.} 16... Qf7 17. exf5 gxf5 18. Bh3 {Another potential target. Fischer now hits all White's pieces with tempo, and it's no surprise that in the end something must drop.} 18... f4 {This does weaken the light squares, but such considerations are of lesser importance than king safety, which White lacks.} 19. Qg6 {White must have thought this move got him out of trouble, but punishment is swift.} 19... Ng5 { The winning move. White has too many pieces hanging.} 20. Bxd7 Bxd7 21. Qxf7+ Rxf7 22. gxf4 {Otherwise Black will trade on g3 and penetrate to f2.} 22... exf4 23. Bd4 Bg4 24. Rd2 Rd7 0-1