| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. Efimenko vs Navara |
| ½-½ | 78 |
1999 |
Groningen Young Masters | C05 French, Tarrasch |
| 2. Efimenko vs V Poletaev |
| 1-0 | 41 |
1999 |
UKR-ch U18 | B99 Sicilian, Najdorf, 7...Be7 Main line |
| 3. Efimenko vs Bu Xiangzhi |
| 0-1 | 36 |
2000 |
KasparovChess Cadet GP net | B62 Sicilian, Richter-Rauzer |
| 4. Sedlak vs Efimenko |
| 0-1 | 49 |
2000 |
t-EuCh U18 | B32 Sicilian |
| 5. I Dubinka vs Efimenko |
| 0-1 | 40 |
2000 |
Ukrainian Team ch | E83 King's Indian, Samisch |
| 6. Efimenko vs G Arzumanian |
| 0-1 | 40 |
2000 |
Ukrainian Team ch | B32 Sicilian |
| 7. Nakamura vs Efimenko |
| ½-½ | 27 |
2000 |
KasparovChess Cadet GP net | C17 French, Winawer, Advance |
| 8. Efimenko vs S Bromberger |
| 1-0 | 41 |
2000 |
t-EuCh U18 | B78 Sicilian, Dragon, Yugoslav Attack, 10.castle long |
| 9. A Kamenets vs Efimenko |
| 0-1 | 36 |
2000 |
Ukrainian Team ch | E75 King's Indian, Averbakh, Main line |
| 10. Efimenko vs A Zubarev |
| 1-0 | 55 |
2000 |
Ukrainian Team ch | B47 Sicilian, Taimanov (Bastrikov) Variation |
| 11. Efimenko vs Nakamura |
 | 1-0 | 40 |
2000 |
KasparovChess Cadet GP net | B99 Sicilian, Najdorf, 7...Be7 Main line |
| 12. Efimenko vs G Szabo |
| 1-0 | 35 |
2000 |
t-EuCh U18 | B85 Sicilian, Scheveningen, Classical |
| 13. G Nesterov vs Efimenko |
| 0-1 | 43 |
2000 |
Ukrainian Team ch | E61 King's Indian |
| 14. F Berkes vs Efimenko |
| 0-1 | 36 |
2000 |
t-EuCh U18 | A15 English |
| 15. O Chaika vs Efimenko |
| ½-½ | 33 |
2000 |
Ukrainian Team ch | B24 Sicilian, Closed |
| 16. E Pinter vs Efimenko |
 | 1-0 | 71 |
2000 |
t-EuCh U18 | B23 Sicilian, Closed |
| 17. Efimenko vs G Timoshenko |
| ½-½ | 15 |
2000 |
Ukrainian Team ch | C92 Ruy Lopez, Closed |
| 18. Bu Xiangzhi vs Efimenko |
| 1-0 | 49 |
2000 |
KasparovChess Cadet GP net | A45 Queen's Pawn Game |
| 19. Efimenko vs S Steindorsson |
| ½-½ | 55 |
2000 |
t-EuCh U18 | B99 Sicilian, Najdorf, 7...Be7 Main line |
| 20. Efimenko vs A Kotsuba |
| 1-0 | 30 |
2000 |
Ukrainian Team ch | B02 Alekhine's Defense |
| 21. Efimenko vs T Kononenko |
| 0-1 | 35 |
2000 |
Ukrainian Team ch | C03 French, Tarrasch |
| 22. H Sadeghi vs Efimenko |
| 0-1 | 39 |
2001 |
MTO | A02 Bird's Opening |
| 23. M Erwich vs Efimenko |
| ½-½ | 36 |
2001 |
WYB16 | C02 French, Advance |
| 24. V Tukmakov vs Efimenko |
| ½-½ | 37 |
2001 |
Master Open | E97 King's Indian |
| 25. Efimenko vs V Mikhalevski |
| ½-½ | 32 |
2001 |
MTO | C80 Ruy Lopez, Open |