[Event "IBM"]
[Site "Amsterdam"]
[Date "1965.??.??"]
[Round "6"]
[White "Langeweg, Kick"]
[Black "Bouwmeester, Hans"]
[Result "1/2-1/2"]

1. Nf3 d5 2. c4 dxc4 3. e3 Nf6 4. Bxc4 e6 5. O-O a6 6. a4 c5 7. d4 Nc6 8. Qe2 Be7 9. Rd1 Qc7 10. Nc3 O-O 11. Bd2 Rd8 12. Be1 Bd7 13. h3 cxd4 14. exd4 Be8 15. Rac1 Bb4 16. Ne4 Qf4 17. Nxf6+ Qxf6 18. d5 exd5 19. Bxd5 Bxe1 20. Rxe1 g6 1/2-1/2