[Event "Milan IT"]
[Round "6"]
[Site "Milan"]
[Date "1975.08.26"]
[White "Petrosian, Tigran V"]
[WhiteElo "2645"]
[Black "Unzicker, Wolfgang"]
[BlackElo "2535"]
[Result "1/2-1/2"]
[ECO "A17"]
[Opening "English Opening, Hedgehog Defence"]
 1. c4   Nf6
 2. Nc3  e6
 3. d4   Bb4
 4. e3   O-O
 5. Bd3  d5
 6. a3   Bxc3+
 7. bxc3 dxc4
 8. Bxc4 c5
 9. Nf3  Qc7
10. Be2  b6
11. O-O  Bb7
12. Bb2  Nbd7
13. h3   Rfd8
14. a4   Rac8
15. Re1  Bxf3
16. gxf3 Ne5
17. Rc1  Qb7
18. f4   Ng6
19. Bf3  Qc7
20. Qe2  Nh4
21. Bh1  Nf5
1/2-1/2