[Event "IBM"]
[Site "Amsterdam"]
[Date "1961.??.??"]
[Round "11"]
[White "Tan, Hiong Liong"]
[Black "Van den Berg, Carel"]
[Result "1/2-1/2"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 e6 5. Nb5 d6 6. c4 Nf6 7. N5c3 Be7 8. Be2 O-O 9. a3 b6 10. O-O Bb7 11. Be3 Rc8 12. Qa4 Qd7 13. Rd1 Rfd8 14. Nd2 Ba8 15. Rac1 Qb7 16. b4 Ne5 17. h3 h6 18. c5 Qb8 19. cxb6 axb6 20. f3 d5 21. exd5 Nxd5 22. Nxd5 Bxd5 23. Qb5 Rxc1 24. Rxc1 Nd7 25. Nc4 Bg5 26. Bxg5 hxg5 27. Rd1 Qc7 28. Ne3 Nf6 29. Nxd5 Nxd5 1/2-1/2