[Event "Interzonal-06"]
[Site "Amsterdam"]
[Date "1964.06.02"]
[Round "11"]
[White "Stein, Leonid"]
[Black "Perez Perez, Francisco Jose"]
[Result "1-0"]

1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3 Bxc3+ 6. bxc3 Ne7 7. Nf3 Qa5 8. Bd2 Nbc6 9.
Be2 Qa4 10. Rb1 cxd4 11. Bb5 Qxa3 12. cxd4 O-O 13. Rb3 Qa2 14. Qc1 a6 15. Bd3 Nf5 16. Ra3
Qxa3 17. Qxa3 Nfxd4 18. Nxd4 Nxd4 19. Bxh7+ Kxh7 1-0