[Event "IBM"]
[Site "Amsterdam"]
[Date "1963.??.??"]
[Round "8"]
[White "Langeweg, Kick"]
[Black "Portisch, Lajos"]
[Result "0-1"]
1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. Nc3 Bb7 5. Bg5 h6 6. Bh4 g5 7. Bg3 Nh5 8. Be5 f6 9. Qc2 fxe5 10. Qg6+ Ke7 11. Qxh5 exd4 12. Nxd4 Bg7 13. e3 Nc6 14. O-O-O Nxd4 15. exd4 Qf8 16. Rd2 Qf4 17. Qd1 Raf8 18. f3 h5 19. Be2 g4 20. Kb1 gxf3 21. Bxf3 Bxf3 22. gxf3 Qxf3 23. Re2 Bxd4 0-1