[Event "IBM"]
[Site "Amsterdam"]
[Date "1970.07.15"]
[Round "2"]
[White "Jongsma, Alexander"]
[Black "Spassky, Boris Vasilievich"]
[Result "0-1"]
1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e6 6. g3 Be7 7. Bg2 O-O 8. O-O a6 9. Be3
Qc7 10. Qe2 Nc6 11. Rad1 Bd7 12. h3 b5 13. a3 Rfc8 14. f4 Rab8 15. Nxc6 Bxc6 16. Bc1 a5
17. Rfe1 b4 18. axb4 axb4 19. Nd5 exd5 20. exd5 Bd7 0-1