[Event "Biel Interzonal"] [Site "Biel SUI"] [Date "1976.08.04"] [Round "18"] [White "Lajos Portisch (?)"] [Black "Gennady Sosonko (?)"] [Result "1-0"] [WhiteElo "?"] [BlackElo "?"] [Variant "Standard"] [TimeControl "-"] [ECO "E53"] [Opening "Nimzo-Indian Defense: Normal Variation, Gligoric System"] [Termination "Normal"] [Annotator "lichess.org"] 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Bd3 d5 6. Nf3 c5 { E53 Nimzo-Indian Defense: Normal Variation, Gligoric System } 7. O-O cxd4 8. exd4 dxc4 9. Bxc4 b6 10. Bg5 Bb7 11. Re1 Nc6 12. a3 Be7 13. Qd3 Nh5?! { (-0.06 → 0.54) Inaccuracy. h6 was best. } (13... h6 14. Bxf6 Bxf6 15. d5 Na5 16. dxe6 Nxc4 17. Qxc4 Rc8 18. Qb3 Qe7 19. Ne4 fxe6 20. Rad1) 14. Bd2 Nf6 15. Rad1 Na5 16. Ba2 Nd5 17. b4 Nxc3?? { (0.93 → 3.37) Blunder. Nc6 was best. } (17... Nc6 18. Nxd5 exd5 19. Re2 Bf6 20. b5 Ne7 21. Ne5 Ng6 22. Bb1 Bxe5 23. dxe5 d4 24. Bb4) 18. Bxc3 Nc6 19. d5 exd5 20. Bxd5 Qc7?! { (2.89 → 4.12) Inaccuracy. Bf6 was best. } (20... Bf6 21. Qc4) 21. b5 Na5 22. Be5 Qc5 23. Bxb7 Nxb7 24. Qd7 Na5 25. Bd4 { Black resigns. } 1-0