[Event "Zuerich"]
[Site "Zuerich"]
[Date "1959.06.02"]
[Round "11"]
[White "Unzicker, Wolfgang"]
[Black "Keller, Dieter"]
[Result "1/2-1/2"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O 8. c3 d6 9. h3 Nd7 10. d4 Nb6 11. Nbd2 exd4 12. cxd4 d5 13. e5 Bf5 14. Nf1 Nb4 15. Ng3 Bg6 16. e6 Nc4 17. exf7+ Rxf7 18. Bxc4 bxc4 19. Ne5 Nc2 20. Nxf7 Kxf7 21. Qf3+ Bf6 22. Bg5 Nxd4 23. Qf4 Nc2 24. Bxf6 Qxf6 25. Qd2 Rd8 26. Ne4 Bxe4 27. Rxe4 dxe4 28. Qxc2 Rd4 29. Re1 Qd6 30. Qe2 Qd5 31. f3 1/2-1/2