[Event "IBM"]
[Site "Amsterdam"]
[Date "1973.??.??"]
[Round "13"]
[White "Petrosian, Tigran V"]
[Black "Ribli, Zoltan"]
[Result "1/2-1/2"]

1. d4 Nf6 2. Nf3 g6 3. Bg5 Bg7 4. Nbd2 O-O 5. c3 d6 6. e3 Nbd7 7. a4 h6 8. Bxf6 Bxf6 9. a5 a6 10. Qc2 e5 11. Bc4 Kh8 12. h4 h5 13. Ne4 Bg7 14. Neg5 Qe7 15. Qb3 e4 16. Nd2 Bh6 17. Nxf7+ Kg7 18. Nxh6 Kxh6 19. Nf1 Nf6 20. f3 exf3 21. gxf3 Ng4 22. fxg4 Bxg4 23. Be2 Rxf1+ 24. Rxf1 Qxe3 25. Qc2 Re8 26. Rf2 Qg3 27. Qd2+ Kg7 28. Qf4 Rxe2+ 29. Kf1 1/2-1/2