| 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. F Berkes vs Efimenko |
| 0-1 | 36 |
2000 |
t-EuCh U18 | A15 English |
| 4. Efimenko vs G Timoshenko |
| ½-½ | 15 |
2000 |
Ukrainian Team ch | C92 Ruy Lopez, Closed |
| 5. E Pinter vs Efimenko |
 | 1-0 | 71 |
2000 |
t-EuCh U18 | B23 Sicilian, Closed |
| 6. Efimenko vs A Kotsuba |
| 1-0 | 30 |
2000 |
Ukrainian Team ch | B02 Alekhine's Defense |
| 7. Bu Xiangzhi vs Efimenko |
| 1-0 | 49 |
2000 |
KasparovChess Cadet GP net | A45 Queen's Pawn Game |
| 8. Efimenko vs S Steindorsson |
| ½-½ | 55 |
2000 |
t-EuCh U18 | B99 Sicilian, Najdorf, 7...Be7 Main line |
| 9. Efimenko vs T Kononenko |
| 0-1 | 35 |
2000 |
Ukrainian Team ch | C03 French, Tarrasch |
| 10. Efimenko vs Bu Xiangzhi |
| 0-1 | 36 |
2000 |
KasparovChess Cadet GP net | B62 Sicilian, Richter-Rauzer |
| 11. I Dubinka vs Efimenko |
| 0-1 | 40 |
2000 |
Ukrainian Team ch | E83 King's Indian, Samisch |
| 12. Sedlak vs Efimenko |
| 0-1 | 49 |
2000 |
t-EuCh U18 | B32 Sicilian |
| 13. Efimenko vs G Arzumanian |
| 0-1 | 40 |
2000 |
Ukrainian Team ch | B32 Sicilian |
| 14. Nakamura vs Efimenko |
| ½-½ | 27 |
2000 |
KasparovChess Cadet GP net | C17 French, Winawer, Advance |
| 15. A Kamenets vs Efimenko |
| 0-1 | 36 |
2000 |
Ukrainian Team ch | E75 King's Indian, Averbakh, Main line |
| 16. Efimenko vs S Bromberger |
| 1-0 | 41 |
2000 |
t-EuCh U18 | B78 Sicilian, Dragon, Yugoslav Attack, 10.castle long |
| 17. Efimenko vs A Zubarev |
| 1-0 | 55 |
2000 |
Ukrainian Team ch | B47 Sicilian, Taimanov (Bastrikov) Variation |
| 18. Efimenko vs Nakamura |
 | 1-0 | 40 |
2000 |
KasparovChess Cadet GP net | B99 Sicilian, Najdorf, 7...Be7 Main line |
| 19. G Nesterov vs Efimenko |
| 0-1 | 43 |
2000 |
Ukrainian Team ch | E61 King's Indian |
| 20. Efimenko vs G Szabo |
| 1-0 | 35 |
2000 |
t-EuCh U18 | B85 Sicilian, Scheveningen, Classical |
| 21. O Chaika vs Efimenko |
| ½-½ | 33 |
2000 |
Ukrainian Team ch | B24 Sicilian, Closed |
| 22. V Tukmakov vs Efimenko |
| ½-½ | 37 |
2001 |
Master Open | E97 King's Indian |
| 23. J Berkvens vs Efimenko |
| 0-1 | 33 |
2001 |
Stork YM | E97 King's Indian |
| 24. Miroshnichenko vs Efimenko |
| ½-½ | 17 |
2001 |
2nd Governor's Cup | B52 Sicilian, Canal-Sokolsky (Rossolimo) Attack |
| 25. Efimenko vs Blatny |
| 1-0 | 68 |
2001 |
2nd IECC | C10 French |