[Event "1973 Canadian Open"]  [Site "Ottawa"]  [White "Ken Rogoff"]  [Black "Duncan Suttles"]  [Result "0-1"]  [ECO "B06"]  [Annotator "ATH"]  [PlyCount "94"]  [EventDate "1973.07.28"]  [EventType "swiss"]  [EventRounds "11"]  [EventCountry "CAN"]  [SourceTitle "Canbase"]  [SourceDate "2015.08.19"]  [SourceVersion "1"]  [SourceVersionDate "2015.08.19"]  [SourceQuality "1"]   1. e4 g6 2. d4 d6 3. Nf3 Bg7 4. Bc4 (4. c3 $1 $14) 4... Nf6 5. Qe2 O-O 6. O-O  Bg4 7. c3 Nc6 (7... Nbd7 $5) 8. Bb5 (8. h3 $5 Bxf3 9. Qxf3 e5 $11) 8... a6 (  8... Qe8 $5 9. Nbd2 a6 (9... Nh5 $1 $11) 10. Bd3 (10. Bxc6 Qxc6 $11 {  Torre-Hort, Amsterdam 1979}) 10... Nh5 $11 {Kovacevic-Planinec, Zagreb 1077})  9. Bxc6 bxc6 10. Nbd2 a5 11. e5 $146 (11. Re1 $5 {Lutikov-Razuvaev,  Cheliabinsk 1972 and Chernuschevich-Hamdouchi, Belfort 2010}) 11... Nd5 12. c4  $2 (12. h3 $11) 12... Nb4 13. h3 Bf5 14. Ne4 c5 $1 {"Things fall apart; the  centre cannot hold;"} 15. d5 (15. dxc5 dxe5 16. Rd1 Qc8 17. Ng3 Qe6 $17) 15...  c6 16. e6 (16. Rd1 cxd5 17. cxd5 dxe5 18. d6 h6 $1 19. d7 Qc7 20. a3 Na6 $17)  16... fxe6 17. dxe6 Qc8 (17... d5 $1 18. Nxc5 Qd6 19. Nd7 dxc4 20. Nxf8 Bd3 21.  Qd2 Rxf8 22. Rd1 a4 $1 $19) 18. a3 Na6 19. Neg5 $6 (19. Bd2 Nc7 $15) 19... Nc7  20. Re1 Rb8 $6 (20... h6 21. g4 (21. Ne4 Qxe6 22. Bd2 Bxe4 23. Qxe4 Qxe4 24.  Rxe4 e5 $17) 21... hxg5 22. Nxg5 (22. gxf5 Rxf5 23. Rb1 Bf6 $19) 22... Bd4 23.  gxf5 Rxf5 $17) 21. Nh4 $6 (21. Nf7 $1 Qxe6 22. Nh6+ Kh8 23. Qxe6 Bxe6 24. Ng5  Bxc4 25. Rxe7 Nb5 $15) 21... Rb3 22. Nxf5 (22. Nf7 $5 Qxe6 23. Nxf5 gxf5 24.  Qxe6 Nxe6 25. Nxd6 exd6 26. Rxe6 Be5 $17) 22... Rxf5 23. Nf7 (23. Rb1 Qf8 24.  Bd2 Bd4 25. Rf1 a4 $17) 23... Rf6 (23... Nxe6 $142 24. Nh6+ Bxh6 25. Bxh6 Kf7  $17) 24. Nh6+ Kf8 25. Qc2 (25. Bg5 Rxe6 26. Qg4 Bxb2 27. Qf4+ Bf6 28. Bxf6 exf6  (28... Rxf6 $2 29. Qh4 Ne8 30. Ng4 Rf7 31. Qh6+ Kg8 32. Qg5 Kf8 33. Qh6+ $11)  29. Ng4 Qd8 $17) 25... a4 26. Ng4 Rxe6 27. Bh6 Bxh6 28. Nxh6 Kg7 29. Qd2 Qf8 (  29... Rb7 $1 $17) 30. Ng4 $2 (30. Rad1 Rb7 $17) 30... h5 31. Nh2 (31. Ne3 {  puts up more resistance}) 31... Qf6 32. Qa5 ({as does} 32. Rab1) 32... Rxb2 (  32... Rxe1+ 33. Rxe1 Rxb2 {is even stronger}) 33. Nf3 (33. Rf1 Rxf2 $1 {  is bad for White but not quite so bad as the game}) 33... Rxe1+ 34. Rxe1 Ne6  35. Qa7 (35. Qxa4 Nd4 36. Qd1 Nxf3+ 37. Qxf3 Qxf3 38. gxf3 Kf6 $19 {is  irrelevantly better}) 35... Kh6 $2 (35... Ra2 $1 $19 {is the quick method}) 36.  h4 Ra2 37. Qd7 $6 (37. Qxa4 Nd4 $19 {leaves Black with more work to do}) 37...  Ra1 38. Rxa1 Qxa1+ 39. Kh2 Nd4 $2 (39... Qf6 $19 {I'm guessing that the  players were in a time scramble}) 40. Nxd4 (40. Ng5 $1 Ne2 41. Nh3 Qe5+ $17)  40... Qxd4 41. Qxe7 Qxc4 $2 {Grabs the wrong pawn!} (41... Qxf2 42. Qg5+ Kg7  43. Qe7+ Qf7 44. Qxd6 Qxc4 $17) 42. Qe3+ $2 {misses the draw!} (42. Qf6 $1 $11)  42... Kg7 43. Qe7+ Qf7 44. Qxd6 Qxf2 45. Qe7+ Qf7 46. Qxc5 Qf4+ 47. g3 Qe4 $17  {Stockfish rates this position as -1.24 after 32 ply. It certainly seems like  resignation is premature. Possibly the time control was at move 50 and White  overstepped. Or maybe the scoresheets became illegible at this point Who  knows? But it was certainly an interesting game to this point.} 0-1