Memorized Fisher game

ok I did it... I memorized my first GM game. I love move 28. My next task is to look at the response to 28. ... dxe4. 29. N3xe4... my computer chess software (crafty & fritz) don't see a forced mate. I wrote Mr. Pandolfini at Chesscafe.com to get his opinion. In his book he said N3xe4... Nf6+ with subsequent mate. I don't see it and neither does Crafty or Fritz 8. [Event "?"] [Site "Buenos Aires"] [Date "1970.??.??"] [Round "8"] [White "Fischer,Robert J"] [Black "Panno,Oscar"] [Result "1-0"] [ECO "B40"] 1. e4 c5 2. Nf3 e6 3. d3 Nc6 4. g3 g6 5. Bg2 Bg7 6. O-O Nge7 7. Re1 d6 8. c3 O-O 9. d4 cxd4 10. cxd4 d5 11. e5 Bd7 12. Nc3 Rc8 13. Bf4 Na5 14. Rc1 b5 15. b3 b4 16. Ne2 Bb5 17. Qd2 Nac6 18. g4 a5 19. Ng3 Qb6 20. h4 Nb8 21. Bh6 Nd7 22. Qg5 Rxc1 23. Rxc1 Bxh6 24. Qxh6 Rc8 25. Rxc8+ Nxc8 26. h5 Qd8 27. Ng5 Nf8 28. Be4 Qe7 29. Nxh7 Nxh7 30. hxg6 fxg6 31. Bxg6 Ng5 32. Nh5 Nf3+ 33. Kg2 Nh4+ 34. Kg3 Nxg6 35. Nf6+ Kf7 36. Qh7+ 1-0