| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 26. G Mazziotti Irigoyen vs S Mareco |
| 0-1 | 47 | 2004 | Buenos Aires Najdorf Talents | B31 Sicilian, Rossolimo Variation |
| 27. G Mazziotti Irigoyen vs P Roque |
| 1-0 | 40 | 2004 | Argentine Championship | B13 Caro-Kann, Exchange |
| 28. C Dolezal vs G Mazziotti Irigoyen |
| ½-½ | 78 | 2004 | Argentine Championship | B01 Scandinavian |
| 29. D Flores vs G Mazziotti Irigoyen |
| 1-0 | 80 | 2004 | Argentine Championship | C53 Giuoco Piano |
| 30. G Mazziotti Irigoyen vs J Szmetan |
| 0-1 | 56 | 2004 | Argentine Championship | C47 Four Knights |
| 31. G Mazziotti Irigoyen vs A de Dovitiis |
| 0-1 | 28 | 2004 | Argentine Championship | C00 French Defense |
| 32. C Curatola vs G Mazziotti Irigoyen |
| 0-1 | 46 | 2004 | Argentine Championship | D00 Queen's Pawn Game |
| 33. G Mazziotti Irigoyen vs A Anelli |
| 1-0 | 45 | 2004 | Argentine Championship | B36 Sicilian, Accelerated Fianchetto |
| 34. M Semprevivo vs G Mazziotti Irigoyen |
| 0-1 | 37 | 2004 | Argentine Championship | C86 Ruy Lopez, Worrall Attack |
| 35. G Mazziotti Irigoyen vs D Flores |
| ½-½ | 62 | 2004 | Buenos Aires Najdorf-A | E00 Queen's Pawn Game |
| 36. D Flores vs G Mazziotti Irigoyen |
| ½-½ | 53 | 2004 | Villa Martelli Pro-Am op 11th | C85 Ruy Lopez, Exchange Variation Doubly Deferred (DERLD) |
| 37. P Bulo vs G Mazziotti Irigoyen |
| 0-1 | 31 | 2005 | Villa Ballester LV op | D25 Queen's Gambit Accepted |
| 38. G Mazziotti Irigoyen vs E Scarella |
| 0-1 | 50 | 2005 | Villa Ballester LV op | A13 English |
| 39. K Spraggett vs G Mazziotti Irigoyen |
 | 1-0 | 49 | 2005 | American Continental | C92 Ruy Lopez, Closed |
| 40. G Mazziotti Irigoyen vs R Ronco |
| ½-½ | 57 | 2005 | American Continental | E01 Catalan, Closed |
| 41. S Malajovich vs G Mazziotti Irigoyen |
| 0-1 | 41 | 2005 | American Continental | D23 Queen's Gambit Accepted |
| 42. G Mazziotti Irigoyen vs N Delgado Ramirez |
| ½-½ | 57 | 2005 | American Continental | E00 Queen's Pawn Game |
| 43. D Mieles Palau vs G Mazziotti Irigoyen |
| ½-½ | 67 | 2005 | American Continental | C51 Evans Gambit |
| 44. L Liascovich vs G Mazziotti Irigoyen |
| 1-0 | 37 | 2005 | American Continental | D25 Queen's Gambit Accepted |
| 45. G Mazziotti Irigoyen vs C Goldwaser |
| 1-0 | 34 | 2005 | American Continental | A10 English |
| 46. G Mazziotti Irigoyen vs Bachmann |
| 0-1 | 32 | 2005 | American Continental | B40 Sicilian |
| 47. M Ianovsky vs G Mazziotti Irigoyen |
| 1-0 | 49 | 2005 | American Continental | D25 Queen's Gambit Accepted |
| 48. J F Cubas vs G Mazziotti Irigoyen |
| 1-0 | 58 | 2006 | Buenos Aires Torre Blanca | C55 Two Knights Defense |
Kibitzing
