| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. M Graifer vs K Alekseenko |
| 0-1 | 21 |
2008 |
EU-ch U12 18th | B00 Uncommon King's Pawn Opening |
| 2. K Alekseenko vs S Samdanov |
| 0-1 | 61 |
2008 |
EU-ch U12 18th | B06 Robatsch |
| 3. K Alekseenko vs A Giri |
| 0-1 | 37 |
2008 |
27th Blokadny youth | B44 Sicilian |
| 4. K Alekseenko vs J Lampert |
| ½-½ | 57 |
2008 |
EU-ch U12 18th | C55 Two Knights Defense |
| 5. K Alekseenko vs A Burtasova |
| 0-1 | 60 |
2009 |
Chigorin Memorial Open | C58 Two Knights |
| 6. I Duzhakov vs K Alekseenko |
| 1-0 | 97 |
2009 |
Chigorin Memorial Open | D11 Queen's Gambit Declined Slav |
| 7. A Ulanov vs K Alekseenko |
| ½-½ | 41 |
2009 |
Chigorin Memorial Open | D24 Queen's Gambit Accepted |
| 8. K Alekseenko vs V Fedoseev |
| 0-1 | 90 |
2009 |
Chigorin Memorial Open | B74 Sicilian, Dragon, Classical |
| 9. K Alekseenko vs T Laurusas |
| 1-0 | 61 |
2010 |
WYCC Open U14 | B43 Sicilian, Kan, 5.Nc3 |
| 10. K Alekseenko vs A Aghaei |
| 1-0 | 64 |
2010 |
WYCC Open U14 | C00 French Defense |
| 11. K Alekseenko vs Nima Javanbakht |
 | ½-½ | 75 |
2010 |
WYCC Open U14 | B33 Sicilian |
| 12. K Alekseenko vs Ayan Akhmetov |
| 0-1 | 39 |
2010 |
WYCC Open U14 | B84 Sicilian, Scheveningen |
| 13. D Adelberg vs K Alekseenko |
| 0-1 | 68 |
2010 |
WYCC Open U14 | E15 Queen's Indian |
| 14. L Lekic vs K Alekseenko |
| 0-1 | 54 |
2010 |
WYCC Open U14 | B60 Sicilian, Richter-Rauzer |
| 15. T Harutyunian vs K Alekseenko |
| 0-1 | 53 |
2010 |
WYCC Open U14 | E12 Queen's Indian |
| 16. S Vaibhav vs K Alekseenko |
| 0-1 | 39 |
2010 |
WYCC Open U14 | B57 Sicilian |
| 17. K Izzat vs K Alekseenko |
| 1-0 | 85 |
2010 |
WYCC Open U14 | E00 Queen's Pawn Game |
| 18. D Solak vs K Alekseenko |
| 0-1 | 61 |
2012 |
13th European Individual Championship | C61 Ruy Lopez, Bird's Defense |
| 19. V Lyaskovsky vs K Alekseenko |
 | 0-1 | 51 |
2012 |
Russian Team Championships | A07 King's Indian Attack |
| 20. P Tvarijonas vs K Alekseenko |
| 1-0 | 69 |
2012 |
23rd Czech Open A | C61 Ruy Lopez, Bird's Defense |
| 21. A Kovalyov vs K Alekseenko |
| ½-½ | 40 |
2012 |
Chigorin Memorial | A21 English |
| 22. K Alekseenko vs Potkin |
| ½-½ | 41 |
2012 |
13th European Individual Championship | B46 Sicilian, Taimanov Variation |
| 23. K Alekseenko vs A Mukashev |
| 1-0 | 70 |
2012 |
23rd Czech Open A | C00 French Defense |
| 24. N Vitiugov vs K Alekseenko |
| 1-0 | 53 |
2012 |
Chigorin Memorial | D20 Queen's Gambit Accepted |
| 25. K Alekseenko vs E L'Ami |
| ½-½ | 70 |
2012 |
13th European Individual Championship | C65 Ruy Lopez, Berlin Defense |