[Event "Alekhine memorial"]
[Round "4"]
[Site "Moscow"]
[Date "1971.11.28"]
[White "Petrosian, Tigran V"]
[WhiteElo "2640"]
[Black "Uhlmann, Wolfgang"]
[BlackElo "2570"]
[Result "1/2-1/2"]
[ECO "D86"]
[Opening "Gruenfeld, Exchange, Classical Variation"]
 1. d4   Nf6
 2. c4   g6
 3. Nc3  d5
 4. cxd5 Nxd5
 5. e4   Nxc3
 6. bxc3 Bg7
 7. Bc4  O-O
 8. Ne2  Nc6
 9. O-O  b6
10. Bg5  Na5
11. Bd3  Qd7
12. Qd2  c5
13. Rab1 Bb7
14. d5   c4
15. Bc2  e6
16. dxe6 Qxe6
17. Rfe1 Rfe8
18. Nd4  Qd6
19. Qe3  Qc5
20. Qg3  Nc6
1/2-1/2