[Event "IBM"]
[Site "Amsterdam"]
[Date "1970.07.21"]
[Round "7"]
[White "Spassky, Boris Vasilievich"]
[Black "Tringov, Georgi Petrov"]
[Result "1/2-1/2"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 O-O 6. Be3 b6 7. Bd3 Bb7 8. Nge2 c5 9. d5 e6 10. O-O exd5 11. exd5 Nbd7 12. Bg5 Qe7 13. f4 h6 14. Bh4 a6 15. a4 Rfe8 16. h3 Qf8 17. Rf3 Nh7 18. Qc2 Bc8 19. Raf1 Ra7 20. g4 Kh8 21. Be1 1/2-1/2