| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 26. R Lahaye vs R Hendriks |
 | 1-0 | 52 | 2000 | Dutch Open | C56 Two Knights |
| 27. R Lahaye vs Van der Wiel |
| 0-1 | 39 | 2000 | Dutch Open | A22 English |
| 28. M Smits vs R Lahaye |
| ½-½ | 32 | 2000 | Dutch Open | B99 Sicilian, Najdorf, 7...Be7 Main line |
| 29. G Szuveges vs R Lahaye |
| ½-½ | 20 | 2000 | Dutch Open | D30 Queen's Gambit Declined |
| 30. R Lahaye vs S Drent |
| 1-0 | 28 | 2000 | Dutch Open | A14 English |
| 31. R Odendahl vs R Lahaye |
| 1-0 | 41 | 2000 | Dutch Open | A04 Reti Opening |
| 32. J Bosch vs R Lahaye |
| 1-0 | 72 | 2000 | Amsterdam Lost Boys Open | D10 Queen's Gambit Declined Slav |
| 33. R Lahaye vs F van Harreveld |
| 0-1 | 30 | 2000 | Amsterdam Lost Boys Open | D34 Queen's Gambit Declined, Tarrasch |
| 34. J Jens vs R Lahaye |
| 1-0 | 36 | 2000 | Amsterdam Lost Boys Open | B90 Sicilian, Najdorf |
| 35. R Lahaye vs B Byklum |
| ½-½ | 39 | 2000 | Amsterdam Lost Boys Open | B20 Sicilian |
| 36. C van Dongen vs R Lahaye |
| 1-0 | 39 | 2000 | Amsterdam Lost Boys Open | D15 Queen's Gambit Declined Slav |
| 37. R Lahaye vs A Sadewasser |
| 0-1 | 56 | 2000 | Amsterdam Lost Boys Open | C02 French, Advance |
| 38. R Lahaye vs E Oosterom |
| ½-½ | 33 | 2000 | Amsterdam Lost Boys Open | C42 Petrov Defense |
| 39. R Lahaye vs V Meijers |
| 0-1 | 61 | 2001 | Dieren op | B20 Sicilian |
| 40. N Vink vs R Lahaye |
| 1-0 | 46 | 2001 | Dieren op | B90 Sicilian, Najdorf |
| 41. R Lahaye vs L Zimmermann |
| 1-0 | 64 | 2001 | Dieren op | A22 English |
| 42. D Hamelink vs R Lahaye |
| ½-½ | 7 | 2001 | Dieren op | B96 Sicilian, Najdorf |
| 43. R Lahaye vs H Paalman |
| 1-0 | 43 | 2001 | Dieren op | A07 King's Indian Attack |
| 44. X Wemmers vs R Lahaye |
| 0-1 | 37 | 2001 | Dieren op | B90 Sicilian, Najdorf |
| 45. R Lahaye vs R Hartoch |
| ½-½ | 18 | 2001 | Dieren op | A42 Modern Defense, Averbakh System |
| 46. Stellwagen vs R Lahaye |
| 1-0 | 23 | 2001 | Dieren op | B92 Sicilian, Najdorf, Opocensky Variation |
| 47. R Lahaye vs J Bosch |
| 0-1 | 47 | 2001 | Dieren op | B30 Sicilian |
| 48. R Lahaye vs Kazhgaleyev |
| 0-1 | 35 | 2004 | Zwolle Windesheim op-A | C56 Two Knights |
| 49. S Ernst vs R Lahaye |
| 0-1 | 29 | 2004 | Zwolle Windesheim op-A | A14 English |
| 50. M Bosboom vs R Lahaye |
| 1-0 | 58 | 2004 | NED-ch op | D30 Queen's Gambit Declined |
Kibitzing
