"Just like in checkers, jumping opponent's pieces is mandatory. It means that if a player's piece stands next to an opponent's piece and can jump it, it is forced to do it and it must continue jumping as long as it can."
It is near the bottom of the page, under "Other important rules"
(hide) You can use some of the simpler HTML on your messages or, if you're a paying member, can also use the Rich Text Editor. (pauloaguia) (show all tips)