Luzern, 1962
1. d4, Nf6
2. c4, e6
3. Nc3, c5
4. d5, exd5
5. cxd5, d6
6. e4, g6
7. f4, Bg7
8. Bb5+, Nfd7
9. a4! ....
Strengthens the queen side against pawn attack (i.e. 9....a6, 10. Be2 b5, 12. a3 b4!).
9. .... Na6
10. Nf3, Nb4
11. 0-0, a6?!
12. Bxd7+!, Bxd7
13. f5! ....
13. .... 0-0
If 13....gxf5, 14. Bg5 Bf6, 15. Bf4 0-0, 16. e5! dxe5, 17. Nxe5 ... and White has the advantage.
14. Bg5, f6
15. Bf4, gxf5?
If Black decides to protect the d6 pawn by 15...Qe7, then White may respond 16. Re1! ...
16. Bxd6, Bxa4
17. Rxa4, Qxd6
18. Nh4!, fxe4
19. Nf5, Qd7
If 19...Qe5, then 20. Qg5! ... and White's attack will be overwhelming.
20. Nxe4, Kh8
If 20....Rae8, then 21. Qg4 Kh8, 22. Nxc5! ...
21. Nxc5, Resigns
Black's position becomes hopeless after 21....Qxd5, 22. Qxd5 Nxd5, 23. Ne6 ....
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