| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. H Brodie vs G Olheiser |
| 1-0 | 14 |
1974 |
Canadian Open | A00 Uncommon Opening |
| 2. G Olheiser vs G Norton |
| 1-0 | 18 |
1988 |
Grand Prix #3 | B00 Uncommon King's Pawn Opening |
| 3. G Olheiser vs P Becker |
| 1-0 | 25 |
1989 |
Concordia Chess Club | B99 Sicilian, Najdorf, 7...Be7 Main line |
| 4. G Olheiser vs K Pacey |
| 1-0 | 40 |
1996 |
Ontario Open | B00 Uncommon King's Pawn Opening |
| 5. G Olheiser vs B Rabethge |
| 0-1 | 46 |
1998 |
Concordia Championship | B00 Uncommon King's Pawn Opening |
| 6. G Olheiser vs G Morrell |
| 0-1 | 31 |
1998 |
Concordia Championship | B09 Pirc, Austrian Attack |
| 7. T Knechtel vs G Olheiser |
| 0-1 | 39 |
1998 |
Concordia Championship | A45 Queen's Pawn Game |
| 8. G Olheiser vs S Kennel |
| 1-0 | 37 |
1998 |
Concordia Championship | B09 Pirc, Austrian Attack |
| 9. G Olheiser vs T McClelland |
| 1-0 | 61 |
1998 |
Concordia Championship | B00 Uncommon King's Pawn Opening |
| 10. S Kuehl vs G Olheiser |
| ½-½ | 29 |
1998 |
Concordia Championship | A15 English |
| 11. Alex Toolsie vs G Olheiser |
| 0-1 | 28 |
1998 |
Concordia Championship | B22 Sicilian, Alapin |
| 12. D Wilson-Grange vs G Olheiser |
| 0-1 | 64 |
1998 |
Concordia Championship | B57 Sicilian |
| 13. H Bond vs G Olheiser |
| 0-1 | 42 |
1998 |
Concordia Championship | B21 Sicilian, 2.f4 and 2.d4 |
| 14. G Olheiser vs D Wagner |
| 1-0 | 28 |
1998 |
Concordia Championship | B45 Sicilian, Taimanov |
| 15. G Olheiser vs J McDonald |
| 0-1 | 34 |
2008 |
Oktoberfest I | A15 English |
| 16. B Hartman vs G Olheiser |
| 1-0 | 30 |
2008 |
Oktoberfest I | B06 Robatsch |
| 17. K Morrison vs G Olheiser |
 | 1-0 | 58 |
2008 |
Oktoberfest I | A40 Queen's Pawn Game |
| 18. G Olheiser vs M Dougherty |
 | ½-½ | 27 |
2009 |
KW Winter Open Pro | A04 Reti Opening |
| 19. M Egorov vs G Olheiser |
| ½-½ | 33 |
2009 |
KW Winter Open Pro | B70 Sicilian, Dragon Variation |
| 20. G Olheiser vs A Mayo |
 | 1-0 | 64 |
2009 |
KW Winter Open Pro | A04 Reti Opening |
| 21. G Olheiser vs J Zoccano |
| ½-½ | 37 |
2010 |
Oktoberfest - Open | D12 Queen's Gambit Declined Slav |
| 22. G Olheiser vs T Song |
| 0-1 | 51 |
2010 |
Fall ProAm | A57 Benko Gambit |
| 23. M Dougherty vs G Olheiser |
| 1-0 | 43 |
2010 |
Oktoberfest - Open | C17 French, Winawer, Advance |
| 24. M Egorov vs G Olheiser |
| 1-0 | 58 |
2010 |
Fall ProAm | A04 Reti Opening |
| 25. G Olheiser vs R Bzikot |
| 1-0 | 29 |
2010 |
Oktoberfest - Open | A80 Dutch |