[Event "Hoogovens"]
[Site "Wijk aan Zee"]
[Date "1971.01.23"]
[Round "10"]
[White "Kortschnoj, Viktor Lvovich"]
[Black "Ivkov, Borislav"]
[Result "1/2-1/2"]

1. c4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. g3 d5 5. cxd5 Nxd5 6. Bg2 Be6 7. O-O Nb6 8. d3 Be7 9. a3 O-O 10. b4 a6 11. Be3 f5 12. Rb1 Bf6 13. Na4 Nxa4 14. Qxa4 Nd4 15. Nxd4 exd4 1/2-1/2