| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 26. K Dreyer vs H Catozzi |
| ½-½ | 20 | 1957 | Dublin Zonal | A47 Queen's Indian |
| 27. K Plater vs H Catozzi |
| 1-0 | 62 | 1957 | Dublin Zonal | C47 Four Knights |
| 28. Gligoric vs H Catozzi |
| 1-0 | 62 | 1957 | Dublin Zonal | E59 Nimzo-Indian, 4.e3, Main line |
| 29. H Catozzi vs W Fairhurst |
| 0-1 | 35 | 1957 | Dublin Zonal | D11 Queen's Gambit Declined Slav |
| 30. J Durao vs H Catozzi |
 | 1-0 | 45 | 1957 | Dublin Zonal | C85 Ruy Lopez, Exchange Variation Doubly Deferred (DERLD) |
| 31. H Catozzi vs A Giustolisi |
| 0-1 | 31 | 1957 | Dublin Zonal | B40 Sicilian |
| 32. H Catozzi vs L Schmid |
| 0-1 | 85 | 1957 | Dublin Zonal | D43 Queen's Gambit Declined Semi-Slav |
| 33. H Catozzi vs D De Loughrey |
| 1-0 | 34 | 1958 | Munich Olympiad qual-1 | A60 Benoni Defense |
| 34. P Ravn vs H Catozzi |
| 0-1 | 33 | 1958 | Munich Olympiad qual-1 | E59 Nimzo-Indian, 4.e3, Main line |
| 35. F Prieto Azuar vs H Catozzi |
| ½-½ | 52 | 1958 | Munich Olympiad qual-1 | E12 Queen's Indian |
| 36. H Catozzi vs Petrosian |
 | 0-1 | 41 | 1958 | Munich Olympiad qual-1 | A16 English |
| 37. E Stoeckl vs H Catozzi |
| 1-0 | 39 | 1958 | Munich Olympiad qual-1 | C92 Ruy Lopez, Closed |
| 38. H Catozzi vs Z Milev |
| 0-1 | 44 | 1958 | Munich Olympiad qual-1 | B32 Sicilian |
| 39. H Koskinen vs H Catozzi |
| 0-1 | 43 | 1958 | Munich Olympiad Final-B | C91 Ruy Lopez, Closed |
| 40. H Catozzi vs I Jonsson |
| 0-1 | 23 | 1958 | Munich Olympiad Final-B | A88 Dutch, Leningrad, Main Variation with c6 |
| 41. E Arnlind vs H Catozzi |
| 1-0 | 46 | 1958 | Munich Olympiad Final-B | C99 Ruy Lopez, Closed, Chigorin, 12...cd |
| 42. H Catozzi vs J Enevoldsen |
| ½-½ | 33 | 1958 | Munich Olympiad Final-B | A23 English, Bremen System, Keres Variation |
| 43. H Catozzi vs L Joyner |
| 0-1 | 59 | 1958 | Munich Olympiad Final-B | A16 English |
| 44. H Catozzi vs P Martin |
| ½-½ | 20 | 1958 | Munich Olympiad Final-B | C56 Two Knights |
| 45. C van den Berg vs H Catozzi |
| 1-0 | 55 | 1958 | Munich Olympiad Final-B | B05 Alekhine's Defense, Modern |
| 46. D Baretic vs H Catozzi |
| 0-1 | 19 | 1963 | Hastings-B 1963/64 | C29 Vienna Gambit |
| 47. N Gaprindashvili vs H Catozzi |
| 1-0 | 47 | 1963 | Hastings-B 1963/64 | C77 Ruy Lopez |
| 48. H Catozzi vs J A Lawrence |
| 1-0 | 54 | 1964 | Hastings-B 1963/64 | D27 Queen's Gambit Accepted, Classical |
| 49. A Phillips vs H Catozzi |
| ½-½ | 39 | 1964 | Hastings-B 1963/64 | C90 Ruy Lopez, Closed |
| 50. H Catozzi vs J Taylor |
| 1-0 | 37 | 1964 | Hastings-B 1963/64 | D41 Queen's Gambit Declined, Semi-Tarrasch |
Kibitzing
