[Event "IBM"]
[Site "Amsterdam"]
[Date "1961.??.??"]
[Round "10"]
[White "Langeweg, Kick"]
[Black "Donner, Jan Hein"]
[Result "0-1"]

1. c4 e5 2. Nc3 Nf6 3. g3 d5 4. cxd5 Nxd5 5. Bg2 Nb6 6. d3 Be7 7. f4 exf4 8. Bxf4 O-O 9. Nf3 Be6 10. O-O c5 11. e4 Nc6 12. Qd2 Qd7 13. Ng5 Bg4 14. h3 Bxg5 15. hxg4 Bxf4 16. gxf4 Qxg4 17. Rf3 Nd4 18. Rf2 Rad8 0-1