| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. K Nikolaidis vs W Schmidt |
| ½-½ | 31 |
1987 |
Athens Acropolis op | A04 Reti Opening |
| 2. K Nikolaidis vs Blatny |
| 1-0 | 36 |
1991 |
x | C55 Two Knights Defense |
| 3. K Nikolaidis vs I Seitaj |
| 0-1 | 41 |
1991 |
It (open) | C55 Two Knights Defense |
| 4. K Nikolaidis vs E Grivas |
| ½-½ | 46 |
1991 |
GRE-ch | A04 Reti Opening |
| 5. K Nikolaidis vs Smirin |
| 0-1 | 40 |
1992 |
Katerini op | E60 King's Indian Defense |
| 6. N Dedes vs K Nikolaidis |
| 0-1 | 34 |
1992 |
Athens Akropolis op | C28 Vienna Game |
| 7. K Nikolaidis vs E Grivas |
| 0-1 | 65 |
1992 |
Ano Liosia op | B32 Sicilian |
| 8. K Nikolaidis vs E Grivas |
| 0-1 | 43 |
1993 |
Komotini GP | B25 Sicilian, Closed |
| 9. I Marinkovic vs K Nikolaidis |
| 1-0 | 33 |
1993 |
It (open) | C26 Vienna |
| 10. K Nikolaidis vs E Grivas |
| 0-1 | 59 |
1993 |
Heraklio op | B32 Sicilian |
| 11. K Nikolaidis vs Miles |
| ½-½ | 58 |
1993 |
Aegina | B04 Alekhine's Defense, Modern |
| 12. K Nikolaidis vs Kotronias |
| ½-½ | 93 |
1995 |
Ch Greece | B67 Sicilian, Richter-Rauzer Attack, 7...a6 Defense, 8...Bd7 |
| 13. I Rogers vs K Nikolaidis |
| ½-½ | 51 |
1995 |
op Agios Nikolaos GRE | B51 Sicilian, Canal-Sokolsky (Rossolimo) Attack |
| 14. K Nikolaidis vs E Grivas |
 | 0-1 | 30 |
1995 |
GRE-ch94 | B80 Sicilian, Scheveningen |
| 15. K Nikolaidis vs I Miladinovic |
| 0-1 | 58 |
1996 |
Aegina op | D07 Queen's Gambit Declined, Chigorin Defense |
| 16. K Nikolaidis vs E Grivas |
| 1-0 | 39 |
1996 |
Aegina op | E70 King's Indian |
| 17. K Nikolaidis vs T Gelashvili |
| 1-0 | 56 |
1997 |
Ikaria op | A04 Reti Opening |
| 18. T Gelashvili vs K Nikolaidis |
 | 1-0 | 30 |
1997 |
GRE-chT | A07 King's Indian Attack |
| 19. K Nikolaidis vs T Gelashvili |
| 0-1 | 68 |
1998 |
Chalkida op 3rd | B53 Sicilian |
| 20. T Karatekin vs K Nikolaidis |
 | 1-0 | 38 |
1998 |
Chalkida op 3rd | A07 King's Indian Attack |
| 21. K Nikolaidis vs A Minasian |
| ½-½ | 60 |
1998 |
Panormo zt | B00 Uncommon King's Pawn Opening |
| 22. I Arvanitis vs K Nikolaidis |
| ½-½ | 33 |
2000 |
4th Open | B33 Sicilian |
| 23. K Nikolaidis vs Glek |
| 0-1 | 36 |
2000 |
4th Open | A90 Dutch |
| 24. S Ovsejevitsch vs K Nikolaidis |
| 1-0 | 38 |
2000 |
4th Open | E43 Nimzo-Indian, Fischer Variation |
| 25. K Nikolaidis vs I Novikov |
| 1-0 | 35 |
2000 |
4th Open | B97 Sicilian, Najdorf |