| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. P Schreiner vs G Halvax |
| 1-0 | 33 | 2004 | AUT-ch U12 | B01 Scandinavian |
| 2. P Schreiner vs G Halvax |
| 0-1 | 40 | 2007 | AUT-ch U16 | B06 Robatsch |
| 3. N Hovhannisyan vs G Halvax |
| ½-½ | 41 | 2007 | Feffernitz Raika op 16th | D30 Queen's Gambit Declined |
| 4. G Halvax vs C Woods |
| 1-0 | 30 | 2008 | EU-ch U16 18th | B33 Sicilian |
| 5. A Pavlidis vs G Halvax |
| 1-0 | 27 | 2008 | EU-ch U16 18th | B30 Sicilian |
| 6. G Halvax vs V Lyaskovsky |
| 0-1 | 38 | 2008 | EU-ch U16 18th | B81 Sicilian, Scheveningen, Keres Attack |
| 7. G Halvax vs J Kociscak |
| 1-0 | 23 | 2008 | EU-ch U16 18th | C45 Scotch Game |
| 8. D Hartl vs G Halvax |
 | 1-0 | 29 | 2009 | First Saturday June | B48 Sicilian, Taimanov Variation |
| 9. T Petenyi vs G Halvax |
| ½-½ | 60 | 2011 | Mitropa Cup | C84 Ruy Lopez, Closed |
| 10. G Halvax vs M Berchtenbreiter |
| 1-0 | 57 | 2012 | TCh-AUT 1st Bundesliga | B90 Sicilian, Najdorf |
| 11. G Halvax vs A D Ivanova |
| 1-0 | 85 | 2012 | JWC2/pr3 | C42 Petrov Defense |
| 12. G Halvax vs P Schreiner |
| ½-½ | 30 | 2012 | TCh-AUT 1st Bundesliga | C67 Ruy Lopez |
| 13. H Zoebisch vs G Halvax |
| 0-1 | 30 | 2012 | Austrian Championship | D49 Queen's Gambit Declined Semi-Slav, Meran |
| 14. G Halvax vs S Baumegger |
| 0-1 | 37 | 2012 | Austrian Championship | A56 Benoni Defense |
| 15. M Ernst vs G Halvax |
| 1-0 | 32 | 2012 | Austrian Championship | D31 Queen's Gambit Declined |
| 16. G Halvax vs E Frank |
| 1-0 | 40 | 2012 | Austrian Championship | C99 Ruy Lopez, Closed, Chigorin, 12...cd |
| 17. K Rogetzer vs G Halvax |
| 1-0 | 51 | 2012 | Austrian Championship | D30 Queen's Gambit Declined |
| 18. G Halvax vs H Titz |
| ½-½ | 44 | 2012 | Austrian Championship | A35 English, Symmetrical |
| 19. R Wiedner vs G Halvax |
| 0-1 | 37 | 2012 | Austrian Championship | D31 Queen's Gambit Declined |
| 20. G Halvax vs F Mesaros |
| 1-0 | 30 | 2012 | Austrian Championship | B12 Caro-Kann Defense |
| 21. G Halvax vs M Neubauer |
| 0-1 | 35 | 2012 | Austrian Championship | C11 French |
| 22. K Bischoff vs G Halvax |
| 1-0 | 30 | 2012 | Austrian Bundesliga 2012/13 | D45 Queen's Gambit Declined Semi-Slav |
| 23. G Halvax vs A Schmidlechner |
| 1-0 | 49 | 2012 | Austrian Bundesliga 2012/13 | B28 Sicilian, O'Kelly Variation |
| 24. G Halvax vs U Ennsberger |
| 1-0 | 27 | 2013 | Austrian Bundesliga 2012/13 | B01 Scandinavian |
| 25. G Halvax vs P Buchnicek |
| ½-½ | 79 | 2013 | Austrian Bundesliga 2012/13 | B12 Caro-Kann Defense |
Kibitzing
