| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. N Theodorou vs G Mitsis |
| 1-0 | 41 | 2017 | 1st Fischer Mem GM | C05 French, Tarrasch |
| 2. G Mitsis vs G Gkoumas |
| ½-½ | 68 | 2017 | 1st Fischer Mem GM | D02 Queen's Pawn Game |
| 3. T Warakomski vs G Mitsis |
| ½-½ | 38 | 2018 | 3rd Fischer Mem GM | C55 Two Knights Defense |
| 4. G Gkoumas vs G Mitsis |
| 0-1 | 39 | 2018 | 4th Fischer Mem GM | C55 Two Knights Defense |
| 5. G Mitsis vs R Praggnanandhaa |
| ½-½ | 14 | 2018 | 4th Fischer Mem GM | D58 Queen's Gambit Declined, Tartakower (Makagonov-Bondarevsky) Syst |
| 6. G Mitsis vs D Gukesh |
| 1-0 | 68 | 2018 | 5th Capablanca Mem GM | E92 King's Indian |
| 7. G Mitsis vs S Zhigalko |
 | 1-0 | 47 | 2019 | European Championship | E12 Queen's Indian |
| 8. S Lomasov vs G Mitsis |
| 1-0 | 67 | 2019 | European Championship | C45 Scotch Game |
| 9. G Mitsis vs D Zoler |
| ½-½ | 43 | 2019 | European Championship | D11 Queen's Gambit Declined Slav |
| 10. N Petriashvili vs G Mitsis |
| ½-½ | 49 | 2019 | European Championship | A33 English, Symmetrical |
| 11. G Mitsis vs N Tutisani |
| 1-0 | 50 | 2019 | European Championship | A67 Benoni, Taimanov Variation |
| 12. R Dimitrov vs G Mitsis |
| 1-0 | 35 | 2019 | European Championship | A37 English, Symmetrical |
| 13. G Mitsis vs B Belyakov |
| ½-½ | 67 | 2019 | European Championship | D21 Queen's Gambit Accepted |
| 14. R Kevlishvili vs G Mitsis |
| 1-0 | 53 | 2019 | European Championship | C07 French, Tarrasch |
| 15. G Mitsis vs A Macovei |
| 0-1 | 42 | 2019 | European Championship | E12 Queen's Indian |
| 16. D Jandric vs G Mitsis |
| 0-1 | 28 | 2019 | European Championship | C78 Ruy Lopez |
| 17. G Gkoumas vs G Mitsis |
| ½-½ | 22 | 2019 | 8th Ideon Andron Op | C45 Scotch Game |
| 18. H A Gretarsson vs G Mitsis |
| ½-½ | 69 | 2019 | 7th Fischer Mem GM | E32 Nimzo-Indian, Classical |
| 19. F Baenziger vs G Mitsis |
| 1-0 | 26 | 2019 | 7th Fischer Mem GM | A07 King's Indian Attack |
| 20. G Mitsis vs T Stoyanov |
| ½-½ | 60 | 2019 | 7th Fischer Mem GM | E11 Bogo-Indian Defense |
| 21. G Mitsis vs N Theodorou |
| ½-½ | 68 | 2021 | Greek Hybrid World Cup Q | E92 King's Indian |
| 22. G Mitsis vs M Materia |
| ½-½ | 54 | 2022 | 8th Fischer Memorial | E06 Catalan, Closed, 5.Nf3 |
| 23. G Mitsis vs A Nesterov |
| ½-½ | 81 | 2023 | European Championship | E04 Catalan, Open, 5.Nf3 |
| 24. V Dragnev vs G Mitsis |
| 1-0 | 65 | 2023 | European Championship | C78 Ruy Lopez |
| 25. M Muradli vs G Mitsis |
| ½-½ | 68 | 2023 | European Championship | E06 Catalan, Closed, 5.Nf3 |
Kibitzing
