| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. H Zygouris vs G Andruet |
| 0-1 | 27 | 1989 | Akropolis op | A57 Benko Gambit |
| 2. E Grivas vs H Zygouris |
| ½-½ | 45 | 1989 | Corfu op | D91 Grunfeld, 5.Bg5 |
| 3. H Zygouris vs M Tan |
| 1-0 | 66 | 1990 | Wch U16 | E34 Nimzo-Indian, Classical, Noa Variation |
| 4. M Jonker vs H Zygouris |
| ½-½ | 49 | 1990 | Wch U16 | B50 Sicilian |
| 5. D Ong vs H Zygouris |
| ½-½ | 50 | 1990 | Wch U16 | B21 Sicilian, 2.f4 and 2.d4 |
| 6. H Zygouris vs T Toh |
| ½-½ | 74 | 1990 | Wch U16 | D32 Queen's Gambit Declined, Tarrasch |
| 7. H Zygouris vs C Zhu |
| 1-0 | 20 | 1990 | Wch U16 | C53 Giuoco Piano |
| 8. D Alho vs H Zygouris |
| 0-1 | 31 | 1990 | Wch U16 | D31 Queen's Gambit Declined |
| 9. H Zygouris vs D Langier |
| 0-1 | 53 | 1990 | Wch U16 | A99 Dutch, Ilyin-Genevsky Variation with b3 |
| 10. I Peck vs H Zygouris |
| 1-0 | 23 | 1990 | Wch U16 | B23 Sicilian, Closed |
| 11. C Gokhale vs H Zygouris |
| 0-1 | 52 | 1990 | Wch U16 | C02 French, Advance |
| 12. S Pedersen vs H Zygouris |
 | 1-0 | 20 | 1990 | Wch U16 | D37 Queen's Gambit Declined |
| 13. H Zygouris vs B Ivanovic |
 | 1-0 | 65 | 1990 | Corfu Open | E33 Nimzo-Indian, Classical |
| 14. S Conquest vs H Zygouris |
| 1-0 | 37 | 1992 | Iraklion op | B96 Sicilian, Najdorf |
| 15. P Tegelidis vs H Zygouris |
| 0-1 | 26 | 1993 | Katerini GP | E83 King's Indian, Samisch |
| 16. T Thorhallsson vs H Zygouris |
| ½-½ | 30 | 1993 | Katerini GP | B23 Sicilian, Closed |
| 17. H Zygouris vs S van Gisbergen |
| 0-1 | 37 | 1994 | Cappelle Open | C77 Ruy Lopez |
| 18. O Averkin vs H Zygouris |
| 1-0 | 27 | 1994 | Cappelle Open | E94 King's Indian, Orthodox |
| 19. N Mitkov vs H Zygouris |
| 1-0 | 23 | 1994 | Cappelle Open | B43 Sicilian, Kan, 5.Nc3 |
| 20. E Solozhenkin vs H Zygouris |
| 1-0 | 54 | 1994 | Cappelle Open | E81 King's Indian, Samisch |
| 21. P Depyl vs H Zygouris |
| 0-1 | 51 | 1994 | Cappelle Open | B50 Sicilian |
| 22. G Grigorov vs H Zygouris |
| 1-0 | 20 | 2010 | Bansko Grand Chess Open | D27 Queen's Gambit Accepted, Classical |
| 23. J Ashwin vs H Zygouris |
| 1-0 | 40 | 2010 | Bansko Grand Chess Open | C10 French |
| 24. H Zygouris vs M Zaslavsky |
| 0-1 | 36 | 2010 | Bansko Grand Chess Open | A20 English |
| 25. H Zygouris vs S Strelnikov |
| 0-1 | 33 | 2010 | Bansko Grand Chess Open | A37 English, Symmetrical |
Kibitzing
