19 problem combinations of Roel Boomstra
2:37:06
130 openingsslagzetten voor geoefenden, deel 1 wit wint
1:07:42
Roel Boomstra part II 29 victories ( Wch 2016, 2018, 2022 )
17:44
28 problem combinations of Alexey Chizhov
33:52
100 International draughts- combination (lidraughts)
24:42
Best of Alexey Chizov (10x10)
17:05
Jan Groenendijk-Roel Boomstra.The match for the title of World Draughts Champion 2016
10:44
La COMBINAISON de la double Trappe- Vidéo # 97
16:04