| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. L Steiner vs H Klass |
| 0-1 | 43 | 1936 | Simultaneous clock exhibition | E46 Nimzo-Indian |
| 2. H Klass vs C Purdy |
 | 1-0 | 47 | 1945 | New South Wales-ch | C61 Ruy Lopez, Bird's Defense |
| 3. H Klass vs R E Armati |
| 1-0 | 49 | 1945 | AUS-corr ch | D63 Queen's Gambit Declined, Orthodox Defense |
| 4. H Klass vs G Koshnitsky |
| 1-0 | 31 | 1946 | New South Wales Ch | E27 Nimzo-Indian, Samisch Variation |
| 5. H Klass vs A Frijda |
| 0-1 | 27 | 1946 | AUS-ch | C15 French, Winawer |
| 6. M Raizman vs H Klass |
| 1-0 | 41 | 1946 | AUS-FRA m | A13 English |
| 7. H Klass vs B H Johnson |
| 1-0 | 28 | 1947 | New South Wales Ch | B50 Sicilian |
| 8. C Purdy vs H Klass |
| 1-0 | 29 | 1947 | New South Wales Ch | A27 English, Three Knights System |
| 9. G Abrahams vs H Klass |
| ½-½ | 39 | 1947 | AUS - GB radio match | C24 Bishop's Opening |
| 10. H Klass vs J G Baay |
| 0-1 | 33 | 1951 | AUS-ch | C64 Ruy Lopez, Classical |
| 11. L Endzelins vs H Klass |
| ½-½ | 40 | 1951 | Australian championship | E00 Queen's Pawn Game |
| 12. J Kellner vs H Klass |
| 1-0 | 35 | 1952 | AUS-ch | A40 Queen's Pawn Game |
| 13. M Kuszelansky vs H Klass |
| 0-1 | 74 | 1952 | AUS-ch | A40 Queen's Pawn Game |
| 14. H B Williamson vs H Klass |
| 0-1 | 29 | 1954 | City of Sydney Championship | A04 Reti Opening |
| 15. H Klass vs W Leonhardt |
| 1-0 | 19 | 1958 | Australian Championship 1958/59 | B06 Robatsch |
| 16. H Klass vs P Viner |
| ½-½ | 40 | 1958 | Australian Championship 1958/59 | D63 Queen's Gambit Declined, Orthodox Defense |
| 17. K Ozols vs H Klass |
| ½-½ | 36 | 1958 | Australian Championship 1958/59 | E66 King's Indian, Fianchetto, Yugoslav Panno |
| 18. V Zagorovsky vs H Klass |
| ½-½ | 46 | 1959 | corr | C89 Ruy Lopez, Marshall |
| 19. R Pikler vs H Klass |
| 1-0 | 27 | 1959 | Australian Championship 1958/59 | C27 Vienna Game |
| 20. H Klass vs J R Phillips |
| 1-0 | 48 | 1959 | Australian Championship 1958/59 | A45 Queen's Pawn Game |
| 21. D Pike vs H Klass |
| 0-1 | 45 | 1959 | Australian Championship 1958/59 | A40 Queen's Pawn Game |
| 22. H Klass vs A Bachtiar |
| ½-½ | 52 | 1959 | Australian Championship 1958/59 | D01 Richter-Veresov Attack |
| 23. H Klass vs O Weber |
| 1-0 | 19 | 1959 | Australian Championship 1958/59 | C13 French |
| 24. H Klass vs J Hanks |
| ½-½ | 54 | 1959 | Australian Championship 1958/59 | D01 Richter-Veresov Attack |
| 25. B Berger vs H Klass |
| 1-0 | 47 | 1959 | Australian Championship 1958/59 | C13 French |
Kibitzing
