[Event "Buenos Aires"]
[Site "Buenos Aires"]
[Date "1970.07.23"]
[Round "4"]
[White "Smyslov, Vassily V"]
[Black "Najdorf, Miguel"]
[Result "1/2-1/2"]

1. c4 Nf6 2. Nc3 e6 3. Nf3 d5 4. d4 Bb4 5. e3 O-O 6. Bd3 c5 7. O-O dxc4 8. Bxc4 Nc6 9. a3 Ba5 10. Bd3 a6 11. Ne4 cxd4 12. exd4 h6 13. b4 Bc7 14. Bb2 Nd5 15. Re1 b6 16. Rc1 Nce7 17. g3 Bb7 18. Bf1 Rc8 19. Ne5 Bb8 20. Rxc8 Nxc8 21. Bg2 1/2-1/2