In the course of a move, a checker may land on a free point or a point occupied by the player's own checkers.
It may also land on a point occupied by exactly one opposing checker. In this case, the checker is trapped until the player remove his checker.
As long a checker is trapped, it's impossible to play it and the point is see as not available (more than one checker). The player who blocked the opponent can continue to use this point as if it contained only checkers of his own color.
A checker can never be played on a point occupied by two or more checkers of the opponent.
There is a special case: if the player block a checker that is still on the starting point of the opponent and he has himself no checker still on his own starting point, he wins the game directly.
If the starting points of the two players are simultaneously blocked, the game is drawn.