| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 51. A Kostin vs S Kislov |
| 1-0 | 31 | 1997 | Zagorovsky Memorial op | B22 Sicilian, Alapin |
| 52. A Kostin vs S Arkhipov |
| 0-1 | 28 | 1997 | Zagorovsky Memorial op | B21 Sicilian, 2.f4 and 2.d4 |
| 53. I Sotnikov vs A Kostin |
| 1-0 | 31 | 1997 | Zagorovsky Memorial op | A58 Benko Gambit |
| 54. D Rodin vs A Kostin |
| 0-1 | 39 | 1997 | Zagorovsky Memorial op | B43 Sicilian, Kan, 5.Nc3 |
| 55. A Molev vs A Kostin |
| 0-1 | 42 | 1997 | Zagorovsky Memorial op | B28 Sicilian, O'Kelly Variation |
| 56. E Sapunov vs A Kostin |
| 1-0 | 55 | 1998 | RUS-ch sf | D37 Queen's Gambit Declined |
| 57. A Kostin vs O Svirin |
| 0-1 | 42 | 1998 | RUS-ch sf | A07 King's Indian Attack |
| 58. M Nedochetov vs A Kostin |
| 0-1 | 35 | 1998 | RUS-ch sf | D37 Queen's Gambit Declined |
| 59. V Kozak vs A Kostin |
| 0-1 | 23 | 1998 | RUS-ch sf | B23 Sicilian, Closed |
| 60. A Shestoperov vs A Kostin |
| 0-1 | 43 | 1998 | Voronezh op | A57 Benko Gambit |
| 61. A Kostin vs V Yemelin |
| 1-0 | 41 | 1999 | RUS-Cup | B00 Uncommon King's Pawn Opening |
| 62. A Kostin vs S Guliev |
| 0-1 | 41 | 1999 | RUS-Cup | B13 Caro-Kann, Exchange |
| 63. R Hasangatin vs A Kostin |
| 0-1 | 41 | 1999 | Russian Club Championship | B40 Sicilian |
| 64. A Lastin vs A Kostin |
| 0-1 | 40 | 1999 | RUS-Cup | B42 Sicilian, Kan |
| 65. A Kostin vs A Iljushin |
| 1-0 | 45 | 1999 | RUS-Cup | A07 King's Indian Attack |
| 66. A Kostin vs P Kotsur |
| 0-1 | 40 | 1999 | RUS-Cup | B06 Robatsch |
| 67. L Totsky vs A Kostin |
| 1-0 | 47 | 1999 | RUS-Cup | A07 King's Indian Attack |
| 68. S Kiselev vs A Kostin |
| 1-0 | 33 | 1999 | RUS-Cup | D38 Queen's Gambit Declined, Ragozin Variation |
| 69. A Dashko vs A Kostin |
| 1-0 | 47 | 1999 | Voronezh op 3rd | B42 Sicilian, Kan |
| 70. D Rodin vs A Kostin |
| 1-0 | 48 | 1999 | Voronezh op 3rd | B42 Sicilian, Kan |
| 71. P Kostenko vs A Kostin |
| 0-1 | 22 | 1999 | RUS-Cup | B42 Sicilian, Kan |
| 72. A Kostin vs Landa |
| ½-½ | 66 | 1999 | Russian Club Championship | B43 Sicilian, Kan, 5.Nc3 |
| 73. V Nevostrujev vs A Kostin |
| 0-1 | 56 | 1999 | Russian Club Championship | B40 Sicilian |
| 74. A Kostin vs A Fedulov |
| 0-1 | 31 | 1999 | Russian Club Championship | C00 French Defense |
| 75. A Kostin vs S Sivokho |
| ½-½ | 66 | 1999 | Russian Club Championship | B01 Scandinavian |
Kibitzing
