[Event "IBM"]
[Site "Amsterdam"]
[Date "1971.07.27"]
[Round "12"]
[White "Hartoch, Robert G"]
[Black "Bobotsov, Milko Georgiev"]
[Result "1/2-1/2"]

1. c4 g6 2. e4 c5 3. Nf3 Nc6 4. d4 cxd4 5. Nxd4 Nf6 6. Nc3 Nxd4 7. Qxd4 d6 8. Be3 Bg7 9. f3 O-O 10. Qd2 Bd7 11. Rc1 Qa5 12. Bd3 Rfc8 13. O-O a6 14. b3 b5 15. Rc2 b4 16. Ne2 Rab8 17. h3 Be8 18. f4 Nd7 19. Kh1 Nc5 20. f5 Bc6 21. Rf4 Qc7 22. Rh4 e6 23. Nd4 Qb7 24. Nxc6 Qxc6 25. Bh6 Be5 26. Be3 Re8 27. Bxc5 Qxc5 28. Qh6 exf5 29. exf5 1/2-1/2