[Event "IBM"]
[Site "Amsterdam"]
[Date "1969.??.??"]
[Round "10"]
[White "Portisch, Lajos"]
[Black "Langeweg, Kick"]
[Result "1-0"]
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 c5 5. Bd3 O-O 6. Nf3 d5 7. O-O dxc4 8. Bxc4 Nc6 9. a3 Ba5 10. Bd3 Qe7 11. Ne4 cxd4 12. b4 Bb6 13. b5 Nb8 14. Nxf6+ Qxf6 15. exd4 h6 16. Bb2 Nd7 17. Bb1 Rd8 18. Qc2 Nf8 19. Re1 Ba5 20. Re3 Bd7 21. Qe2 Rac8 22. Be4 Rc7 23. d5 Bc3 24. Rc1 1-0