[Event "Interzonal"]
[Site "Bienne"]
[Date "1976.08.04"]
[Round "18"]
[White "Portisch L."]
[Black "Sosonko G."]
[Result "1-0"]
[ECO "E57"]
[WhiteElo "2625"]
[BlackElo "2505"]
[SetUp "1"]
[FEN "r2q1rk1/pb3ppp/1pn1pn2/6B1/1bBP4/2N2N2/PP3PPP/R2QR1K1 w - - 0 12"]
[PlyCount "27"]
[EventDate "1976.07.11"]
[EventType "tourn"]
[EventRounds "19"]
[EventCountry "SUI"]
[EventCategory "12"]
[SourceTitle "IZT"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

12. a3 Be7 13. Qd3 Nh5 14. Bd2 Nf6 15. Rad1 Na5 16. Ba2 Nd5 17. b4 Nxc3 18. Bxc3 Nc6 19. d5 exd5 20. Bxd5 Qc7 21. b5 Na5 22. Be5 Qc5 23. Bxb7 Nxb7 24. Qd7 Na5 25. Bd4 1-0

