| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. Efimenko vs V Poletaev |
| 1-0 | 41 |
1999 |
UKR-ch U18 | B99 Sicilian, Najdorf, 7...Be7 Main line |
| 2. Efimenko vs S Bromberger |
| 1-0 | 41 |
2000 |
t-EuCh U18 | B78 Sicilian, Dragon, Yugoslav Attack, 10.castle long |
| 3. Efimenko vs Bu Xiangzhi |
| 0-1 | 36 |
2000 |
KasparovChess Cadet GP net | B62 Sicilian, Richter-Rauzer |
| 4. Efimenko vs G Arzumanian |
| 0-1 | 40 |
2000 |
Ukrainian Team ch | B32 Sicilian |
| 5. Efimenko vs G Szabo |
| 1-0 | 35 |
2000 |
t-EuCh U18 | B85 Sicilian, Scheveningen, Classical |
| 6. Efimenko vs Nakamura |
 | 1-0 | 40 |
2000 |
KasparovChess Cadet GP net | B99 Sicilian, Najdorf, 7...Be7 Main line |
| 7. Efimenko vs A Zubarev |
| 1-0 | 55 |
2000 |
Ukrainian Team ch | B47 Sicilian, Taimanov (Bastrikov) Variation |
| 8. Efimenko vs S Steindorsson |
| ½-½ | 55 |
2000 |
t-EuCh U18 | B99 Sicilian, Najdorf, 7...Be7 Main line |
| 9. Efimenko vs J Werle |
| ½-½ | 59 |
2001 |
Stork YM | B58 Sicilian |
| 10. Efimenko vs I Cheparinov |
| ½-½ | 20 |
2001 |
WYB16 | B78 Sicilian, Dragon, Yugoslav Attack, 10.castle long |
| 11. Efimenko vs C Lupulescu |
| ½-½ | 34 |
2001 |
TCh-Europe Boys U18 | B67 Sicilian, Richter-Rauzer Attack, 7...a6 Defense, 8...Bd7 |
| 12. Efimenko vs V Rogovski |
| 1-0 | 51 |
2001 |
ch-UKR | B32 Sicilian |
| 13. Efimenko vs P Konguvel |
| 1-0 | 25 |
2001 |
MTO | B78 Sicilian, Dragon, Yugoslav Attack, 10.castle long |
| 14. Efimenko vs Deepan Chakkravarthy J |
| 1-0 | 56 |
2001 |
WYB16 | B84 Sicilian, Scheveningen |
| 15. Efimenko vs D Baramidze |
| 1-0 | 40 |
2001 |
TCh-Europe Boys U18 | B84 Sicilian, Scheveningen |
| 16. Efimenko vs A Goloshchapov |
| ½-½ | 28 |
2001 |
ch-UKR | B43 Sicilian, Kan, 5.Nc3 |
| 17. Efimenko vs Areshchenko |
| 1-0 | 35 |
2001 |
2nd Governor's Cup | B78 Sicilian, Dragon, Yugoslav Attack, 10.castle long |
| 18. Efimenko vs A Gershon |
| ½-½ | 23 |
2001 |
MTO | B64 Sicilian, Richter-Rauzer Attack |
| 19. Efimenko vs D Porat |
| 1-0 | 27 |
2001 |
WYB16 | B78 Sicilian, Dragon, Yugoslav Attack, 10.castle long |
| 20. Efimenko vs I Derjabin |
| 1-0 | 25 |
2001 |
UKR-chT | B40 Sicilian |
| 21. Efimenko vs I Miladinovic |
| ½-½ | 32 |
2001 |
2nd IECC | B48 Sicilian, Taimanov Variation |
| 22. Efimenko vs N Vink |
| ½-½ | 60 |
2001 |
Stork YM | B92 Sicilian, Najdorf, Opocensky Variation |
| 23. Efimenko vs Miroshnichenko |
| ½-½ | 22 |
2001 |
2nd Governor's Cup | B61 Sicilian, Richter-Rauzer, Larsen Variation, 7.Qd2 |
| 24. Efimenko vs A Szeberenyi |
| 1-0 | 29 |
2001 |
TCh-Europe Boys U18 | B43 Sicilian, Kan, 5.Nc3 |
| 25. Efimenko vs Z Kozul |
| 1-0 | 45 |
2001 |
ECC | B67 Sicilian, Richter-Rauzer Attack, 7...a6 Defense, 8...Bd7 |