[Event "Piatigorsky Cup 2nd"]
[Round "11"]
[Site "Santa Monica"]
[Date "1966"]
[White "Ivkov, Borislav"]
[Black "Najdorf, Miguel"]
[Result "1/2-1/2"]
[ECO "E19"]
[Opening "Queen's Indian, Old Main line, 9.Qxc3"]
 1. d4   Nf6
 2. c4   e6
 3. Nf3  b6
 4. g3   Bb7
 5. Bg2  Be7
 6. O-O  O-O
 7. Nc3  Ne4
 8. Qc2  Nxc3
 9. Qxc3 d6
10. Qc2  f5
11. Ne1  Bxg2
12. Nxg2 Qd7
13. Rd1  Nc6
14. Qa4  Ne5
15. Qxd7 Nxd7
16. Nf4  Kf7
17. b3   g5
18. Nd3  Bf6
19. Bb2  a5
20. a3   
1/2-1/2