| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. C Purdy vs H Klass |
| 1-0 | 33 | 1935 | Sydney Invitational | E34 Nimzo-Indian, Classical, Noa Variation |
| 2. L Steiner vs H Klass |
| 0-1 | 43 | 1936 | Simultaneous clock exhibition | E46 Nimzo-Indian |
| 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 C Purdy |
 | 1-0 | 47 | 1945 | New South Wales-ch | C61 Ruy Lopez, Bird's Defense |
| 5. D McGrath vs H Klass |
| 0-1 | 30 | 1945 | Australian Championship | E00 Queen's Pawn Game |
| 6. H Klass vs R G Wade |
| 1-0 | 29 | 1945 | Australian Championship | B73 Sicilian, Dragon, Classical |
| 7. H Klass vs A L Miller |
| 1-0 | 46 | 1945 | Australian Championship | C12 French, McCutcheon |
| 8. H Klass vs A Frijda |
| 0-1 | 27 | 1946 | AUS-ch | C15 French, Winawer |
| 9. H Klass vs G Koshnitsky |
| 1-0 | 31 | 1946 | New South Wales Ch | E27 Nimzo-Indian, Samisch Variation |
| 10. M Raizman vs H Klass |
| 1-0 | 41 | 1946 | AUS-FRA m | A13 English |
| 11. C Purdy vs H Klass |
| 1-0 | 29 | 1947 | New South Wales Ch | A27 English, Three Knights System |
| 12. H Klass vs B H Johnson |
| 1-0 | 28 | 1947 | New South Wales Ch | B50 Sicilian |
| 13. G Abrahams vs H Klass |
| ½-½ | 39 | 1947 | AUS - GB radio match | C24 Bishop's Opening |
| 14. M Sturm vs H Klass |
| 1-0 | 17 | 1949 | corr | A40 Queen's Pawn Game |
| 15. R Pikler vs H Klass |
| 0-1 | 32 | 1949 | Training tournament | C13 French |
| 16. G Karoly vs H Klass |
| 0-1 | 32 | 1951 | Australian Championship | C70 Ruy Lopez |
| 17. F Crowl vs H Klass |
| 1-0 | 59 | 1951 | Australian Championship | C10 French |
| 18. D Bowman vs H Klass |
| ½-½ | 54 | 1951 | Australian Championship | C03 French, Tarrasch |
| 19. H Klass vs G Berzzarins |
| 1-0 | 31 | 1951 | Australian Championship | B56 Sicilian |
| 20. L Endzelins vs H Klass |
| ½-½ | 40 | 1951 | Australian Championship | E00 Queen's Pawn Game |
| 21. H Klass vs J G Baay |
| 0-1 | 33 | 1951 | Australian Championship | C64 Ruy Lopez, Classical |
| 22. H Klass vs K Reintals |
| 1-0 | 29 | 1951 | Australian Championship | D45 Queen's Gambit Declined Semi-Slav |
| 23. J Kellner vs H Klass |
| 1-0 | 35 | 1952 | AUS-ch | A40 Queen's Pawn Game |
| 24. M Kuszelansky vs H Klass |
| 0-1 | 74 | 1952 | AUS-ch | A40 Queen's Pawn Game |
| 25. H B Williamson vs H Klass |
| 0-1 | 29 | 1954 | City of Sydney Championship | A04 Reti Opening |
Kibitzing
