[Event "IBM"]
[Site "Amsterdam"]
[Date "1970.07.21"]
[Round "7"]
[White "Polugaevsky, Lev"]
[Black "Jongsma, Alexander"]
[Result "1-0"]

1. c4 e5 2. Nc3 Nf6 3. g3 c6 4. Nf3 e4 5. Nd4 d5 6. cxd5 Qb6 7. Nb3 cxd5 8. Bg2 Bf5 9. d3
exd3 10. O-O Nc6 11. Bg5 O-O-O 12. exd3 Be6 13. Rc1 Kb8 14. d4 Be7 15. Na4 Qc7 16. Nbc5 h6
17. Be3 Rc8 18. Bf4 Bd6 19. Qb3 1-0