[Event "Chigorin Memorial"]
[Site "Sochi URS"]
[Date "1977.09.??"]
[EventDate "1977.08.31"]
[Round "15"]
[Result "1/2-1/2"]
[White "Liuben D Spassov"]
[Black "Tigran V Petrosian"]
[ECO "E91"]
[WhiteElo "2480"]
[BlackElo "2645"]
[Source "ChessBase"]
[PlyCount "24"]

1. Nf3 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. d4 O-O 6. Be2 c6 7. O-O a6 8. Re1 b5
9. e5 Ne8 10. Bf4 Nd7 11. Rc1 Bb7 12. Bf1 dxe5 1/2-1/2