US Championship, 1963
1. e4, g6
2. d4, Bg7
3. Nc3, d6
4. f4, Nf6
5. Nf3, 0-0
6. Bd3, Bg4
7. h3, Bxf3
8. Qxf3, Nc6
9. Be3, e5
10. dxe5, dxe5
11. f5!! ....
The move is intended to weaken Black's king-side pawn structure.
11. .... gxf5
12. Qxf5, Nd4
13. Qf2, Ne8
14. 0-0, Nd6
15. Qg3, Kh8
16. Qg4, c6
17. Qh5 ...
Strategically, Fischer wanted this position. His Queen has to travel from f2 to h5.
17. .... Qe8
18. Bxd4, exd4
19. Rf6 ....
If 19.... Bxf6, then 20. e5!... with a mating threat at h7.
20. e5, h6
21. Ne2, Resigns
If 21. exd6 Bxf6, 22. Qf5 Qe3+, 23. Kh1 Rfe8, 24. Qxf6 dxc3...and White's attack fizzles out.
Definitely not 21. Rxd6 Qxd5 and Black neutralizes the position.
With his last move, White gains a tempo. Now if 21....Qe7, then 22. Raf1 Rfe8, 23. exd6 Qe3+, 24. Kh1 Bxf6, 25. Rxf6 Re7, 26. Rxh6!! ... and White wins.
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