[Event "1978 Northern BC Open"]  [White "Chris Evans"]  [Black "Gyula Sax"]  [Result "0-1"]  [ECO "B84"]  [Annotator "ATH"]  [PlyCount "70"]  [EventDate "1978.08.05"]  [EventType "swiss"]  [EventRounds "5"]  [EventCountry "CAN"]  [SourceTitle "Canbase"]  [SourceDate "2015.08.19"]  [SourceVersion "1"]  [SourceVersionDate "2015.08.19"]  [SourceQuality "1"]   1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Be2 a6 7. f4 (7. O-O {  is the main line}) 7... b5 $5 {Against another GM, this move would probably  rate a ?!} (7... Be7 8. Bf3 O-O 9. O-O Re8 $11) 8. Bf3 Ra7 9. e5 $6 (9. a3 $14)  9... dxe5 10. fxe5 Rd7 (10... Nfd7 11. Bf4 Nc5 $11) 11. exf6 (11. Be3 $5 Bc5  12. exf6 Bxd4 13. Bxd4 Rxd4 14. fxg7 Rxd1+ 15. Rxd1 Rg8 16. Rxd8+ Kxd8 17. Kf2  Rxg7 $11) 11... Rxd4 12. Qe2 b4 $6 (12... gxf6 $11) 13. Ne4 (13. Na4 $5 $14)  13... Bd7 $6 (13... gxf6 14. O-O $14) 14. Qf2 $6 (14. Be3 Bb5 15. Qf2 $18)  14... Bb5 $6 (14... Bc6 15. O-O Bxe4 16. Be3 (16. Bxe4 $2 Qxf6 $15) 16... Rd7  17. fxg7 Bxg7 18. Bxe4 $16) 15. Be3 Rd5 (15... Rxe4 16. Bxe4 Qxf6 17. Qg3 $18 {  is slightly better}) 16. c4 $2 (16. Bb6 $1 Qc8 17. Bd4 g6 18. O-O-O $18) 16...  bxc3 17. Nxc3 Re5 18. Nxb5 $2 (18. Rd1 Qa5 19. Kd2 $1 gxf6 20. Kc1 $14) 18...  Bc5 (18... Qd3 $1 $11) 19. Qc2 $2 (19. Rd1 Rxe3+ 20. Qxe3 Qxd1+ 21. Kxd1 Bxe3  $11) 19... Bxe3 $2 (19... Rxe3+ 20. Be2 Qa5+ 21. Kf1 Nd7 $17) 20. fxg7 Bh6+ $6  (20... Rg8 21. Rd1 Qh4+ 22. g3 Bc5+ 23. Be2 Qb4+ 24. Nc3 Rxg7 $11) 21. Kf1 Bxg7  22. Rd1 Qb6 23. Nd6+ Kf8 $4 (23... Ke7 24. Nc8+ Rxc8 25. Qxc8 Rc5 26. Qb7+ Qxb7  27. Bxb7 Rb5 $11) 24. Nc4 $4 (24. Qc8+ Ke7 25. Qxh8 $18) 24... Qc7 (24... Rc5  $5) 25. h4 (25. Rc1 $11) 25... Rf5 (25... Rc5 $11) 26. b3 Bf6 27. Qd2 Rf4 28.  h5 (28. Ke2 $5 $11) 28... Bd4 (28... Rd4 $5 $11) 29. Qb4+ (29. Nb2 $1 $11)  29... Bc5 30. Qc3 Rg8 31. Qd3 $2 (31. Ke2 $11) 31... Nc6 32. Qd7 $2 (32. Rh3  Nd4 $19) 32... Rxf3+ $1 33. gxf3 Qg3 34. Qc8+ Kg7 35. Qxg8+ Kxg8 0-1