[Event "Interzonal-11a"]
[Site "Riga"]
[Date "1979.09.20"]
[Round "12"]
[White "Gruenfeld, Yehuda"]
[Black "Polugaevsky, Lev"]
[Result "0-1"]
[WhiteElo "2430"]
[BlackElo "2625"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bg5 e6 7. f4 b5 8. e5 dxe5 9. fxe5
Qc7 10. Qe2 Nfd7 11. O-O-O Nc6 12. Nxc6 Qxc6 13. Qd3 h6 14. Bh4 Bb7 15. Be2 Qc7 16. Rhe1
Nc5 17. Qh3 b4 18. Nb5 axb5 19. Bxb5+ Bc6 20. Qf3 Nb3+ 21. Kb1 Na5 22. Rd4 Rc8 23. Red1 g5
24. Bxc6+ Qxc6 25. Qd3 Be7 26. Be1 O-O 27. Bxb4 Bxb4 28. Rxb4 Nc4 29. b3 Nxe5 30. Qe2 Qc3
31. Re4 Nc6 32. Rd3 Qa5 33. Rh3 Nb4 34. c4 Rfd8 35. a4 Qf5 36. Rf3 Qg6 37. Kb2 Qg7+ 38.
Kb1 Rc6 39. c5 Nd5 40. Rc4 Nf4 41. Qb2 Rd1+ 42. Ka2 Qf8 43. Rfc3 Qd8 44. Rc2 Nd3 45. Qc3
Qd5 46. Ka3 Ne5 47. Rb4 Rd3 48. Rb8+ Kg7 49. Qb4 Rd1 50. Ka2 Ra6 51. Rb6 Rd4 52. Qxd4 Qxd4
53. Rxa6 Qd3 0-1