[Event "Sarajevo-11"]
[Site "Sarajevo"]
[Date "1968.03.23"]
[Round "4"]
[White "Ivkov, Borislav"]
[Black "Leban, Slavko"]
[Result "1/2-1/2"]

1. d4 Nf6 2. c4 g6 3. g3 Bg7 4. Bg2 O-O 5. Nf3 d6 6. O-O Nc6 7. d5 Na5 8. Nfd2 c5 9. Nc3 Rb8 10. Qc2 a6 11. b3 b5 12. Bb2 e5 13. dxe6 fxe6 14. cxb5 axb5 15. Rad1 d5 16. a4 Bd7 17. Nxb5 Bxb5 18. axb5 Rxb5 1/2-1/2