Robert Ris vs Koen Leenhouts
Hengelo U20 op Hengelo round 4 2003.08.06
Ruy Lopez: Bird Variation 0-1

Jon Ludvig Hammer vs Koen Leenhouts
European Club Cup Ulcinj MNE round 4.7 2019.11.13
English Opening: Anglo-Indian Defense, Grünfeld Formation 1-0