| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 76. V Malaniuk vs A Kostin |
| 1-0 | 42 | 1999 | Russian Club Championship | E14 Queen's Indian |
| 77. A Kostin vs V Loginov |
| 0-1 | 35 | 1999 | Russian Club Championship | B21 Sicilian, 2.f4 and 2.d4 |
| 78. N Korniushin vs A Kostin |
| ½-½ | 27 | 1999 | Russian Club Championship | A57 Benko Gambit |
| 79. A Kostin vs A Nikitin |
| 0-1 | 32 | 2003 | Voronezh Master op | A07 King's Indian Attack |
| 80. A Kostin vs A Skvortsov |
| 1-0 | 32 | 2004 | Region Champ | C33 King's Gambit Accepted |
| 81. A I Petrushin vs A Kostin |
| 0-1 | 40 | 2004 | RUS-chT2 | B42 Sicilian, Kan |
| 82. A Kostin vs P Tregubov |
| 0-1 | 74 | 2004 | RUS-chT2 | B30 Sicilian |
| 83. A Kostin vs P Bratus |
| 1-0 | 50 | 2004 | Voronezh Open | B07 Pirc |
| 84. S Matsenko vs A Kostin |
| 0-1 | 30 | 2004 | Voronezh Open | B40 Sicilian |
| 85. A Kostin vs D Skorchenko |
| 0-1 | 48 | 2004 | Voronezh Open | C12 French, McCutcheon |
| 86. V Manelis vs A Kostin |
| 1-0 | 57 | 2004 | Voronezh Open | B40 Sicilian |
| 87. V Simakov vs A Kostin |
| 1-0 | 29 | 2004 | Voronezh Open | A69 Benoni, Four Pawns Attack, Main line |
| 88. A Maidel vs A Kostin |
| 1-0 | 29 | 2004 | Moscow tm | B93 Sicilian, Najdorf, 6.f4 |
| 89. V Severgin vs A Kostin |
| 0-1 | 31 | 2004 | Voronezh Region-ch | B12 Caro-Kann Defense |
| 90. I Provotorov vs A Kostin |
| 1-0 | 56 | 2004 | Voronezh Region-ch | B39 Sicilian, Accelerated Fianchetto, Breyer Variation |
| 91. A Kostin vs D Rodin |
| 0-1 | 40 | 2004 | Voronezh Region-ch | C52 Evans Gambit |
| 92. A Kostin vs A Lukovnikov |
| 1-0 | 39 | 2004 | Voronezh Region-ch | B30 Sicilian |
| 93. A Kostin vs K Chernyshov |
| 0-1 | 48 | 2004 | Voronezh Region-ch | C00 French Defense |
| 94. A Kostin vs D Frolyanov |
| 0-1 | 35 | 2005 | RUS-chT 12th | B30 Sicilian |
| 95. A Kostin vs Sakaev |
| 0-1 | 32 | 2005 | RUS-chT 12th | B22 Sicilian, Alapin |
| 96. Potkin vs A Kostin |
| 1-0 | 21 | 2005 | RUS-chT 12th | B40 Sicilian |
| 97. A Kostin vs E Inarkiev |
| 0-1 | 62 | 2005 | Russian Team Championship | B51 Sicilian, Canal-Sokolsky (Rossolimo) Attack |
| 98. M Kobalia vs A Kostin |
 | 0-1 | 38 | 2005 | Russian Team Championship | B43 Sicilian, Kan, 5.Nc3 |
| 99. A Kostin vs V Zakhartsov |
| 0-1 | 31 | 2005 | 9th Chess Festival Voronezh | B51 Sicilian, Canal-Sokolsky (Rossolimo) Attack |
| 100. A Kostin vs S Voitsekhovsky |
| 1-0 | 35 | 2005 | Voronezh op | B22 Sicilian, Alapin |
Kibitzing
