[Event "IBM"]
[Site "Amsterdam"]
[Date "1970.08.01"]
[Round "15"]
[White "Jongsma, Alexander"]
[Black "Tringov, Georgi Petrov"]
[Result "1/2-1/2"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. Nf3 O-O 5. Bg5 d6 6. h3 Nbd7 7. e3 c6 8. Be2 a6 9. O-O b5 10. Nd2 Bb7 11. Rc1 bxc4 12. Nxc4 c5 13. dxc5 Nxc5 14. Bf3 Rb8 15. Bxb7 Rxb7 16. b3 Qa8 17. Qf3 Ra7 18. Qxa8 Rfxa8 1/2-1/2