| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. G Hertneck vs G Klein |
| 1-0 | 29 | 1984 | Bundesliga 1984/85 | A78 Benoni, Classical with ...Re8 and ...Na6 |
| 2. G Kern vs G Klein |
| 1-0 | 22 | 1989 | NRW-Liga II 8889 | A14 English |
| 3. C Achtemichuk vs G Klein |
| 0-1 | 22 | 2005 | Canadian Open | A06 Reti Opening |
| 4. J Mackey vs G Klein |
| ½-½ | 42 | 2005 | Canadian Open | D11 Queen's Gambit Declined Slav |
| 5. G Klein vs P Charbonneau |
| 0-1 | 77 | 2005 | Canadian Open | B42 Sicilian, Kan |
| 6. G Klein vs J Wihnon |
| 1-0 | 57 | 2005 | Canadian Open | B77 Sicilian, Dragon, Yugoslav Attack |
| 7. J Chi vs G Klein |
| 1-0 | 35 | 2005 | Canadian Open | D31 Queen's Gambit Declined |
| 8. G Klein vs H Caron |
| 1-0 | 35 | 2005 | Canadian Open | B90 Sicilian, Najdorf |
| 9. R Gillanders vs G Klein |
| 1-0 | 27 | 2005 | Canadian Open | D02 Queen's Pawn Game |
| 10. G Klein vs S Trandafir |
| 0-1 | 36 | 2005 | Canadian Open | B33 Sicilian |
| 11. B W Thomson vs G Klein |
| 1-0 | 57 | 2005 | Canadian Open | A06 Reti Opening |
| 12. G Klein vs E Raymer |
| 1-0 | 59 | 2005 | Canadian Open | C79 Ruy Lopez, Steinitz Defense Deferred |
| 13. R S Jones vs G Klein |
| 1-0 | 32 | 2006 | 3rd South Wales International | B43 Sicilian, Kan, 5.Nc3 |
| 14. G Klein vs T Thorhallsson |
| 0-1 | 44 | 2011 | Reykjavik Open | B67 Sicilian, Richter-Rauzer Attack, 7...a6 Defense, 8...Bd7 |
| 15. I Agrest vs G Klein |
| 1-0 | 52 | 2011 | Reykjavik Open | B42 Sicilian, Kan |
| 16. G Klein vs D Kjartansson |
| ½-½ | 72 | 2011 | Reykjavik Open | B30 Sicilian |
| 17. M Karlsson vs G Klein |
| 1-0 | 57 | 2011 | Reykjavik Open | A13 English |
| 18. G Klein vs K Kristinsson |
| 1-0 | 21 | 2011 | Reykjavik Open | C77 Ruy Lopez |
| 19. F Steil-Antoni vs G Klein |
| ½-½ | 36 | 2011 | Reykjavik Open | B22 Sicilian, Alapin |
| 20. G Klein vs E Sigurdarson |
| 0-1 | 48 | 2011 | Reykjavik Open | B77 Sicilian, Dragon, Yugoslav Attack |
| 21. A Leosson vs G Klein |
| 0-1 | 57 | 2011 | Reykjavik Open | B28 Sicilian, O'Kelly Variation |
| 22. G Klein vs J Hardarson |
| 1-0 | 32 | 2011 | Reykjavik Open | B77 Sicilian, Dragon, Yugoslav Attack |
| 23. O Kobo vs G Klein |
| 1-0 | 56 | 2014 | Isle of Man Masters | B22 Sicilian, Alapin |
| 24. G Klein vs N Veinberg |
| ½-½ | 37 | 2014 | Isle of Man Masters | C77 Ruy Lopez |
| 25. D Kolbus vs G Klein |
| 1-0 | 73 | 2014 | Isle of Man Masters | A13 English |
Kibitzing
