| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 26. H Grooten vs N Aleksic |
| 0-1 | 72 | 1981 | Caorle Open | A40 Queen's Pawn Game |
| 27. J van Mil vs H Grooten |
| ½-½ | 10 | 1981 | Caorle Open | B12 Caro-Kann Defense |
| 28. D Polajzer vs H Grooten |
| 0-1 | 30 | 1981 | Caorle Open | B22 Sicilian, Alapin |
| 29. H Grooten vs M Tawbeh |
| 1-0 | 37 | 1981 | World Youth U26 Team Championship | A17 English |
| 30. L Bass vs H Grooten |
| 1-0 | 48 | 1981 | World Youth U26 Team Championship | E42 Nimzo-Indian, 4.e3 c5, 5.Ne2 (Rubinstein) |
| 31. G Morrison vs H Grooten |
| 1-0 | 36 | 1981 | World Youth U26 Team Championship | A34 English, Symmetrical |
| 32. H Grooten vs M Paolozzi |
| 1-0 | 40 | 1981 | World Youth U26 Team Championship | A30 English, Symmetrical |
| 33. H Grooten vs G Coppini |
| 0-1 | 32 | 1981 | World Youth U26 Team Championship | D14 Queen's Gambit Declined Slav, Exchange Variation |
| 34. H Grooten vs E E Miolo |
| 1-0 | 77 | 1981 | World Youth U26 Team Championship | A10 English |
| 35. H Grooten vs Vladimirov |
| 0-1 | 28 | 1981 | World Youth U26 Team Championship | A30 English, Symmetrical |
| 36. Plaskett vs H Grooten |
| 1-0 | 27 | 1981 | World Youth U26 Team Championship | B80 Sicilian, Scheveningen |
| 37. H Plukker vs H Grooten |
| 1-0 | 47 | 1981 | NED-ch37 sf-A | E12 Queen's Indian |
| 38. C van Wijgerden vs H Grooten |
| 1-0 | 58 | 1982 | Amsterdam OHRA | A07 King's Indian Attack |
| 39. H Grooten vs S Saeed |
| 0-1 | 58 | 1982 | Amsterdam OHRA | D55 Queen's Gambit Declined |
| 40. H Grooten vs K Langeweg |
| ½-½ | 40 | 1982 | Amsterdam OHRA | E11 Bogo-Indian Defense |
| 41. G Iskov vs H Grooten |
| 1-0 | 27 | 1982 | Amsterdam OHRA | B23 Sicilian, Closed |
| 42. H Grooten vs P Boersma |
| 1-0 | 26 | 1982 | Amsterdam OHRA | D85 Grunfeld |
| 43. J van den Berg vs H Grooten |
| 1-0 | 38 | 1982 | Amsterdam OHRA | E15 Queen's Indian |
| 44. H Grooten vs F van der Vliet |
| 0-1 | 37 | 1982 | Amsterdam OHRA | E12 Queen's Indian |
| 45. R Meulders vs H Grooten |
| 0-1 | 43 | 1982 | Amsterdam OHRA | B51 Sicilian, Canal-Sokolsky (Rossolimo) Attack |
| 46. R Hess vs H Grooten |
| ½-½ | 60 | 1982 | Amsterdam OHRA | E39 Nimzo-Indian, Classical, Pirc Variation |
| 47. D King vs H Grooten |
| 0-1 | 42 | 1982 | 5th Manchester Benedictine Open | B51 Sicilian, Canal-Sokolsky (Rossolimo) Attack |
| 48. H Grooten vs Forintos |
| 0-1 | 45 | 1982 | 5th Manchester Benedictine Open | A10 English |
| 49. Short vs H Grooten |
| 1-0 | 41 | 1982 | 5th Manchester Benedictine Open | B80 Sicilian, Scheveningen |
| 50. H Grooten vs J Tisdall |
| 1-0 | 25 | 1982 | 5th Manchester Benedictine Open | A70 Benoni, Classical with 7.Nf3 |
Kibitzing
