| ECO B12 in 2002 play it! khenkin igor defeats white's belotti bruno in 80 moves | 1. e4 c6 2. d4 d5 3. e5 Bf5 4. c3 e6 5. Be3 Nd7 6. Nd2 f6 7. f4 g5 8. Ngf3 gxf4 9. Bxf4 Bh6 10. Bg3 Qb6 11. Qb3 Ne7 12. Be2 O-O 13. h3 Bg6 14. Bh2 Nf5 15. Nf1 fxe5 16. Qxb6 axb6 17. Bxe5 c5 18. Bb5 Nxe5 19. dxe5 Rf7 20. Kf2 Raf8 21. Bd3 Nh4 22. Bxg6 Nxg6 23. Re1 Bf4 24. N1h2 Nxe5 25. Nxe5 Bxe5+ 26. Nf3 Rf5 27. Re2 d4 28. Rhe1 Bf6 29. cxd4 Bh4+ 30. Kg1 Bxe1 31. Rxe1 cxd4 32. Nxd4 Rd5 33. Re4 e5 34. Nf3 Rf4 35. Re3 e4 36. Ne1 Rd2 37. g3 Rff2 38. Rxe4 Rfe2 39. Rg4+ Kh8 40. Kh1 Re3 |
| ECO B18 in 2000 play it! khenkin igor defeats white's papastavropoulos in 72 moves | 1. e4 c6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Bf5 5. Ng3 Bg6 6. f4 e6 7. Nf3 Nd7 8. c3 Ngf6 9. Bc4 Bd6 10. Qe2 O-O 11. Ne5 c5 12. h4 cxd4 13. Nxg6 hxg6 14. h5 g5 15. h6 g6 16. Ne4 Nxe4 17. Qxe4 Nf6 18. Qxd4 Bxf4 19. O-O Qxd4+ 20. cxd4 Rac8 21. b3 Bxc1 22. Raxc1 Ng4 23. Rce1 Nxh6 24. d5 exd5 25. Bxd5 Rc7 26. Re5 Kg7 27. Rfe1 Rd8 28. Bc4 Nf5 29. g4 Nh4 30. Kf2 Rd2+ 31. Kg3 b5 32. Rxb5 Rg2+ 33. Kh3 Rxa2 34. Rf1 f5 35. Rb8 Re7 36. Rg1 f4 |
| ECO B12 in 1996 play it! khenkin igor defeats white's lurje pawel in 54 moves | 1. e4 c6 2. d4 d5 3. e5 c5 4. dxc5 Nc6 5. Bb5 e6 6. Be3 Ne7 7. c3 Bd7 8. Bxc6 Nxc6 9. Nf3 Qc7 10. Bd4 Nxd4 11. cxd4 b6 12. c6 Bb4+ 13. Nbd2 Qxc6 14. O-O O-O 15. a3 Be7 16. Rc1 Qb7 17. Nb1 Rfc8 18. Rc7 b5 19. b4 Qa6 20. Nbd2 Rab8 21. Qe1 g6 22. Nh4 Be8 23. Qe3 Rxc7 24. Nc4 Qc6 25. Rb1 dxc4 26. Rc1 Bd8 27. Rc3 Qe4 |
| ECO B10 in 2007 play it! khenkin igor defeats white's safranska anda in 90 moves | 1. e4 c6 2. d3 d5 3. Nd2 g6 4. Ngf3 Bg7 5. g3 e5 6. Bg2 Ne7 7. O-O O-O 8. b3 d4 9. a4 c5 10. Nc4 Nbc6 11. Bd2 h6 12. c3 dxc3 13. Bxc3 Qc7 14. Rc1 Be6 15. Qe2 a6 16. Qb2 b5 17. axb5 axb5 18. Ne3 Rfd8 19. b4 Rxd3 20. Ne1 Rdd8 21. Nd5 Nxd5 22. exd5 Bxd5 23. Bxd5 Rxd5 24. bxc5 Rxc5 25. Nd3 Rd5 26. Nf4 Rc5 27. Nd3 Rd5 28. Nf4 Rd6 29. Bxe5 Nxe5 30. Rxc7 Nf3+ 31. Kg2 Bxb2 32. Kxf3 b4 33. Rb7 Bc3 34. Ne2 Bd2 35. Kg2 Ra2 36. Ng1 Bc3 37. Nf3 Kg7 38. h4 Re6 39. h5 g5 40. Nh2 Raa6 41. Rd1 Rab6 42. Rdd7 b3 43. Rxf7+ Kg8 44. Rfc7 Rxb7 45. Rxb7 b2 |
| ECO B14 in 1989 play it! khenkin igor defeats white's zaichik gennadi in 84 moves | 1. e4 c6 2. d4 d5 3. exd5 cxd5 4. c4 Nf6 5. Nc3 e6 6. Nf3 Be7 7. cxd5 Nxd5 8. Bd3 O-O 9. O-O Nc6 10. Re1 Bf6 11. Be4 Nce7 12. Ne5 Nc6 13. Nf3 Nce7 14. Ne5 Nc6 15. Qd3 h6 16. Bxd5 exd5 17. Bf4 Nb4 18. Qd2 Bf5 19. Rac1 Re8 20. Nb5 Bxe5 21. Rxe5 Rxe5 22. dxe5 Nd3 23. Rc3 g5 24. Be3 Nxe5 25. h4 Nc4 26. Qc1 Nxe3 27. Qxe3 Qd7 28. Nd4 Re8 29. Qg3 Re1+ 30. Kh2 Re4 31. Nf3 Rg4 32. Qb8+ Kg7 33. hxg5 hxg5 34. Qe5+ f6 35. Qb8 Rc4 36. Qxa7 Rxc3 37. bxc3 Be4 38. Nd4 Qc7+ 39. Kg1 Qxc3 40. Qxb7+ Kg6 41. Qa7 Qe1+ 42. Kh2 Qxf2 |
| ECO B10 in 1998 play it! khenkin igor defeats white's niedermayr horst in 62 moves | 1. e4 c6 2. d3 d5 3. Nd2 g6 4. Ngf3 Bg7 5. g3 e5 6. Bg2 Ne7 7. O-O O-O 8. Re1 d4 9. Nc4 b5 10. Ncd2 Nd7 11. a4 Nb6 12. a5 Nd7 13. b4 c5 14. bxc5 Nxc5 15. Nb3 Na4 16. Bd2 Nc6 17. Qb1 Qd6 18. h3 Rd8 19. Kh2 Bd7 20. Ng1 Nc3 21. Bxc3 dxc3 22. Ne2 Rac8 23. Rd1 b4 24. Qa2 Be6 25. Rdb1 a6 26. Qa4 Rb8 27. Kg1 Rb5 28. Nec1 Bh6 29. Bf1 Bxc1 30. Rxc1 Bxb3 31. Qxb3 Nd4 |
| ECO B19 in 1998 play it! khenkin igor defeats white's gdanski jacek in 82 moves | 1. e4 c6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Bf5 5. Ng3 Bg6 6. h4 h6 7. Nf3 Nf6 8. Ne5 Bh7 9. Bc4 e6 10. Qe2 Nd5 11. Qf3 Qf6 12. Bxd5 cxd5 13. Qb3 Qe7 14. Qb5+ Kd8 15. h5 f6 16. Ng6 Qb4+ 17. Qxb4 Bxb4+ 18. c3 Bxg6 19. hxg6 Bd6 20. Nh5 Rg8 21. Bf4 Bxf4 22. Nxf4 Kd7 23. O-O-O Nc6 24. c4 Rac8 25. Kb1 dxc4 26. d5 exd5 27. Nxd5 Ke6 28. Nf4+ Kf5 29. g3 Ne5 30. Rd5 Ke4 31. Rhd1 c3 32. bxc3 Rxc3 33. Rb5 b6 34. Nd5 Rd3 35. Re1+ Kf3 36. Nf4 Rc3 37. Nd5 Rd3 38. Nf4 Rc3 39. Nd5 Ra3 40. Ne7 Rd8 41. Rb2 Rd7 |
| ECO B12 in 1998 play it! khenkin igor defeats white's costantini rober in 120 moves | 1. e4 c6 2. d4 d5 3. Nd2 dxe4 4. Nxe4 Bf5 5. Ng3 Bg6 6. N1e2 e6 7. Nf4 Qc7 8. Bc4 Nf6 9. c3 Nbd7 10. O-O Bd6 11. Qf3 O-O-O 12. Re1 Nb6 13. Bb3 Nbd5 14. Nd3 h5 15. Ne5 Bxe5 16. Rxe5 Ng4 17. Re1 Nxh2 18. Kxh2 h4 19. Kg1 hxg3 20. Qxg3 Qxg3 21. fxg3 Rh7 22. Bg5 Rdh8 23. Kf2 Rh5 24. Bf4 Nf6 25. Bd1 Rb5 26. Bc1 Ne4+ 27. Kf3 Nd6 28. Kf2 Ne4+ 29. Kf3 Nf6 30. Kf2 Be4 31. g4 Rh2 32. Bf3 Nxg4+ 33. Kg3 Bxf3 34. gxf3 Rbh5 35. fxg4 R5h3+ 36. Kf4 Rf2+ 37. Ke4 Rg2 38. g5 f5+ 39. Ke5 Kd7 40. Rb1 Rh4 41. Bf4 Rgg4 42. Rf1 Rh2 43. Rbe1 Rxb2 44. c4 Rxa2 45. d5 cxd5 46. cxd5 Ra5 47. Rd1 Rg2 48. Rfe1 Rb5 49. Bc1 Rg4 50. Bf4 Rh4 51. Re2 a5 52. Rh2 Rxh2 53. Bxh2 a4 54. Kf4 Rxd5 55. Rxd5+ exd5 56. Kxf5 b5 57. Kg6 b4 58. Kxg7 b3 59. Be5 a3 60. Kf7 b2 |
| ECO B12 in 2005 play it! khenkin igor defeats white's corvi marco in 92 moves | 1. e4 c6 2. d4 d5 3. e5 c5 4. c4 Nc6 5. Nf3 Bg4 6. cxd5 Qxd5 7. Nc3 Bxf3 8. gxf3 Qxd4 9. Be3 Qxd1+ 10. Rxd1 e6 11. Bb5 Rc8 12. Ke2 a6 13. Bxc6+ Rxc6 14. Rd2 Be7 15. Rhd1 Rc7 16. Ne4 f6 17. Bf4 f5 18. Nf6+ Kf7 19. Nd5 exd5 20. e6+ Kxe6 21. Bxc7 Nf6 22. Kd3 Rc8 23. Re2+ Kf7 24. Be5 Nh5 25. Kc2 d4 26. a4 Rc6 27. Ree1 Bh4 28. Bg3 Bf6 29. Be5 Bh4 30. Bg3 Nxg3 31. fxg3 Bf6 32. g4 c4 33. gxf5 d3+ 34. Kc1 Rb6 35. Re6 Bxb2+ 36. Kd2 Rb3 37. Ke3 Bf6 38. a5 Rb2 39. Rb6 Re2+ 40. Kf4 Be5+ 41. Kg4 Rg2+ 42. Kh4 Rxh2+ 43. Kg4 Rg2+ 44. Kh4 Rb2 45. Re6 Bf6+ 46. Kg4 d2 |
| ECO B12 in 1995 play it! khenkin igor defeats white's san segundo pabl in 78 moves | 1. e4 c6 2. d4 d5 3. e5 c5 4. dxc5 Nc6 5. Bb5 e6 6. b4 a5 7. c3 Bd7 8. Bxc6 Bxc6 9. Nf3 axb4 10. cxb4 b6 11. O-O bxc5 12. bxc5 Bxc5 13. Qc2 Qb6 14. Nbd2 Bb5 15. Rb1 Qc7 16. Nb3 Bxf1 17. Nxc5 Bd3 18. Qxd3 Qxc5 19. a4 Qc4 20. Qa3 Qc2 21. Qb4 Qxa4 22. Qxa4+ Rxa4 23. Rb8+ Kd7 24. Bd2 Ra1+ 25. Ne1 d4 26. f4 Rd1 27. Ba5 d3 28. Rd8+ Ke7 29. Kf2 d2 30. Nc2 Nh6 31. Rxh8 Rf1+ 32. Kxf1 d1=Q+ 33. Ne1 Qd4 34. Bd8+ Kd7 35. Bg5 Qc4+ 36. Kf2 Ng4+ 37. Kg3 Ne3 38. Nf3 h6 39. Bh4 Qe2 |
| ECO B12 in 1999 play it! khenkin igor defeats white's haba petr in 80 moves | 1. e4 c6 2. d4 d5 3. Nd2 dxe4 4. Nxe4 Bf5 5. Ng3 Bg6 6. h4 h6 7. Nf3 Nf6 8. Ne5 Bh7 9. Bc4 e6 10. Qe2 Nd5 11. Qf3 Qf6 12. Bxd5 cxd5 13. Qb3 Qe7 14. Qb5+ Kd8 15. Bd2 f6 16. Nd3 Qd7 17. Qb3 Nc6 18. Ne2 Rc8 19. Rc1 e5 20. O-O Nxd4 21. Nxd4 exd4 22. Rfe1 Rc4 23. Bb4 Bxb4 24. Nxb4 Re8 25. Qa3 Rxe1+ 26. Rxe1 Qd6 27. Qa5+ b6 28. Qxa7 Qxb4 29. Re6 Rc7 30. Qa8+ Rc8 31. Qb7 Bxc2 32. a3 Qc5 33. b4 Rc7 34. Qb8+ Rc8 35. Qb7 Rc7 36. Qa6 Bd3 37. Qxd3 Qc1+ 38. Qf1 d3 39. Qe1 d2 40. Qd1 Qxd1+ |
| ECO B11 in 2002 play it! khenkin igor defeats white's bakre tejas in 110 moves | 1. e4 c6 2. Nc3 d5 3. Nf3 Bg4 4. h3 Bxf3 5. Qxf3 e6 6. d3 Nd7 7. a3 g6 8. g3 Bg7 9. Bg2 Ne7 10. O-O O-O 11. Qe2 Re8 12. h4 b5 13. h5 a5 14. hxg6 hxg6 15. Bg5 Bf6 16. Bxf6 Nxf6 17. Qf3 Kg7 18. exd5 exd5 19. Bh3 Rh8 20. Kg2 Qd6 21. Rae1 b4 22. axb4 axb4 23. Ne2 c5 24. Qf4 Qxf4 25. Nxf4 Nc6 26. Ne2 g5 27. Bf5 Rhe8 28. c4 dxc4 29. dxc4 Ra2 30. Nc1 Rxe1 31. Rxe1 Rxb2 32. Nd3 Rd2 33. Nxc5 Nd4 34. Bb1 b3 35. Ne4 Nxe4 36. Bxe4 f5 37. Bb1 Kf6 38. c5 g4 39. Re3 b2 40. Rd3 Rxd3 41. Bxd3 Ke5 42. Kf1 Kd5 43. Ke1 Kxc5 44. Kd2 Kb4 45. Bb1 Kb3 46. Kd3 Nb5 47. Bc2+ Kb4 48. Bb1 Nc3 49. Bc2 Ne4 50. Ke3 Kc3 51. Bb1 Nd6 52. Ke2 Kd4 53. f3 Ke5 54. fxg4 fxg4 55. Kd3 Nb5 |
| ECO B14 in 2003 play it! khenkin igor defeats white's levushkina elena in 98 moves | 1. e4 c6 2. d4 d5 3. exd5 cxd5 4. c4 Nf6 5. Nc3 e6 6. Nf3 Bb4 7. cxd5 Nxd5 8. Bd2 Nc6 9. Bd3 Be7 10. O-O O-O 11. a3 Nf6 12. Bg5 b6 13. Bc2 Bb7 14. Qd3 g6 15. Rfe1 Re8 16. Rad1 Nd5 17. Bxe7 Ncxe7 18. Ne4 Nf5 19. Bb3 Kg7 20. Ne5 Qe7 21. Qd2 h6 22. Ng4 Red8 23. Ng3 Qg5 24. Qe2 h5 25. Bxd5 Rxd5 26. Nxf5+ Rxf5 27. Ne3 Rf4 28. Qd2 Qf6 29. Nc2 h4 30. Re3 Qg5 31. Ne1 Rd8 32. Qc3 Qf6 33. Nf3 h3 34. d5 Rxd5 35. Qxf6+ Kxf6 36. Rxd5 Bxd5 37. Ne1 hxg2 38. f3 g5 39. Kxg2 g4 40. Kg3 gxf3 41. Nd3 Rf5 42. h4 e5 43. Nf2 Kg6 44. Ng4 f6 45. Rc3 Rf4 46. Nf2 Rd4 47. Rc7 Rd2 48. Rd7 f5 49. Rd8 f4+ |
| ECO B12 in 2004 play it! khenkin igor defeats white's bitalzadeh ali in 52 moves | 1. e4 c6 2. d4 d5 3. Nd2 dxe4 4. Nxe4 Bf5 5. Ng3 Bg6 6. h4 h6 7. Nf3 Nd7 8. h5 Bh7 9. Bd3 Bxd3 10. Qxd3 e6 11. Bd2 Ngf6 12. O-O-O Be7 13. Ne4 O-O 14. g4 Nxg4 15. Rhg1 f5 16. Qb3 Rf7 17. Ng3 Nf8 18. Ne5 Nxe5 19. dxe5 Qd5 20. c4 Qxe5 21. Kb1 Rd8 22. Rde1 Qc7 23. Bxh6 gxh6 24. Nxf5+ Kh7 25. Nxe7 Qxe7 26. Qg3 Qg5 |
| ECO B10 in 2002 play it! khenkin igor defeats white's fernandez garcia in 120 moves | 1. e4 c6 2. c4 d5 3. cxd5 cxd5 4. exd5 Nf6 5. Bb5+ Nbd7 6. Nc3 a6 7. Bxd7+ Qxd7 8. Nf3 Nxd5 9. O-O e6 10. Qb3 f6 11. Re1 Kf7 12. d3 b5 13. Nd4 Nxc3 14. bxc3 Qd5 15. Qxd5 exd5 16. a4 b4 17. Bd2 bxc3 18. Bxc3 Bd6 19. Rab1 Re8 20. Re3 Rb8 21. Rxb8 Bxb8 22. Bb4 Bd7 23. Rxe8 Kxe8 24. a5 Ba7 25. Bc3 Ke7 26. Bb4+ Ke8 27. Bc3 Bc5 28. Kf1 Ke7 29. Ke2 Kd6 30. f4 h5 31. h4 Ba7 32. Bb4+ Bc5 33. Bc3 Ke7 34. Nc2 Bg4+ 35. Kd2 Bf2 36. Nb4 Bc8 37. Ke2 Bxh4 38. Nxd5+ Kd6 39. Ne3 Bg4+ 40. Nxg4 hxg4 41. Ke3 Kd5 42. f5 Bg5+ 43. Ke2 Bf4 44. Kd1 Be5 45. Kc2 Bd4 46. Kb3 Ke5 47. Be1 Kxf5 48. Kc4 Be3 49. Kd5 Kf4 50. Kc6 Bd4 51. Kb7 Ke3 52. Kxa6 Kxd3 53. Kb5 f5 54. Bg3 g5 55. Bc7 f4 56. Bb6 f3 57. gxf3 gxf3 58. a6 f2 59. a7 f1=Q 60. a8=Q Qb1+ |
| ECO B12 in 2002 play it! khenkin igor defeats white's handke florian in 116 moves | 1. e4 c6 2. d4 d5 3. e5 Bf5 4. Nf3 e6 5. Be2 Nd7 6. O-O Bg6 7. b3 Nh6 8. c4 Nf5 9. Na3 Be7 10. Bb2 O-O 11. Qd2 f6 12. Nc2 fxe5 13. dxe5 Nc5 14. Ncd4 Ne4 15. Qd1 Qd7 16. Nxf5 Bxf5 17. Nd4 Bb4 18. Nxf5 Rxf5 19. Bd3 Rd8 20. Qe2 Bc5 21. b4 Bxf2+ 22. Kh1 Qf7 23. g4 Rf3 24. cxd5 cxd5 25. Bxe4 dxe4 26. Qxe4 Rf4 27. Qg2 Rf8 28. Bc1 Be3 29. Rxf4 Qxf4 30. Bxe3 Qxe3 31. Qxb7 Qxe5 32. Rd1 Qe2 33. Rg1 Qxa2 34. Qe4 Rf2 35. Qa8+ Kf7 36. Qb7+ Kf6 37. g5+ Kg6 38. Qe4+ Rf5 39. h4 Qd5 40. Re1 Kf7 41. Qxd5 Rxd5 42. Ra1 Rd7 43. h5 Rb7 44. Kg2 h6 45. Rf1+ Ke7 46. g6 Kd6 47. Ra1 Ke5 48. Kg3 Kf5 49. Ra5+ e5 50. b5 Ke4 51. Kg4 Kd3 52. Ra3+ Kc4 53. Rf3 Kxb5 54. Rf7 Kc6 55. Kf5 a5 56. Kxe5 a4 57. Kd4 a3 58. Kc3 a2 |
| ECO B12 in 2005 play it! khenkin igor defeats white's martin juan manu in 38 moves | 1. e4 c6 2. d4 d5 3. e5 c5 4. dxc5 e6 5. Be3 Nh6 6. c3 Nf5 7. Bd4 Nxd4 8. Qxd4 Qc7 9. b4 a5 10. Nf3 axb4 11. cxb4 b6 12. Be2 bxc5 13. bxc5 Bxc5 14. Qg4 O-O 15. O-O Nc6 16. Bd3 Ba6 17. Bxh7+ Kxh7 18. Ng5+ Kg8 19. Qh5 Bd3 |
| ECO B12 in 1996 play it! khenkin igor defeats white's bancod ronald in 80 moves | 1. e4 c6 2. d4 d5 3. e5 c5 4. c3 Nc6 5. Be2 Bf5 6. Nf3 e6 7. O-O Bg4 8. Nbd2 cxd4 9. cxd4 Nge7 10. h3 Bxf3 11. Nxf3 Nf5 12. g4 Nh4 13. Ne1 h5 14. Be3 hxg4 15. hxg4 Nf5 16. Ng2 Nxe3 17. fxe3 Be7 18. Qb3 Qd7 19. Rac1 Rc8 20. Nf4 Bg5 21. Nh5 O-O 22. Bb5 a6 23. Bxc6 Rxc6 24. Nf4 Rfc8 25. Rxc6 Qxc6 26. Kg2 b5 27. Kf3 a5 28. Qd3 g6 29. Nxg6 Qc2 30. Nf4 Bxf4 31. Qxc2 Rxc2 32. exf4 Rxb2 33. Rf2 Rxf2+ 34. Kxf2 b4 35. Ke2 a4 36. Kd2 Kg7 37. Kc2 Kf8 38. Kb2 Ke7 39. Kc2 Kd7 40. Kb2 Kc6 |
| ECO B12 in 2001 play it! khenkin igor defeats white's kortenbusch chri in 40 moves | 1. e4 c6 2. d4 d5 3. e5 c5 4. dxc5 e6 5. Nf3 Bxc5 6. Bd3 Nc6 7. O-O f6 8. Bf4 g5 9. Bg3 g4 10. Nfd2 fxe5 11. Qxg4 Nf6 12. Qg7 Rg8 13. Qh6 e4 14. Be2 Rg6 15. Bh5 Nxh5 16. Qxh5 Qg5 17. Qxh7 Rh6 18. Qc7 e5 19. Nxe4 dxe4 20. Nc3 Bb6 |
| ECO B12 in 2006 play it! khenkin igor defeats white's vianin pascal in 88 moves | 1. e4 c6 2. d4 d5 3. e5 c5 4. c3 Nc6 5. Nf3 Bg4 6. Be2 e6 7. Nbd2 cxd4 8. Nxd4 Bxe2 9. Qxe2 Nxd4 10. cxd4 Qb6 11. Nf3 Ne7 12. O-O Nf5 13. Rd1 Rc8 14. g4 Ne7 15. Be3 Nc6 16. Rac1 Be7 17. Rc3 O-O 18. Rb3 Qc7 19. Qb5 Rb8 20. Rc1 Qd8 21. Qd3 Qd7 22. Ng5 Bxg5 23. Bxg5 Rbc8 24. Rbc3 h6 25. Bd2 f6 26. exf6 Rxf6 27. g5 hxg5 28. Bxg5 Rf5 29. f4 Rcf8 30. b4 Nxb4 31. Qe2 Nc6 32. Rh3 Qf7 33. Rd1 Rc8 34. Qg4 Qg6 35. Qh4 Kf7 36. Rg3 Ke8 37. Qg4 Kd7 38. Qe2 Rf7 39. Qb5 Rc7 40. Rc1 Qe4 41. f5 Qxf5 42. Be3 Kc8 43. Rg5 Qe4 44. Bf2 Qf4 |