I notice that the international checkers do not follow the official rules of the international draughts federation in one of the most important point about capture:
"4.2. Whenever a man meets, diagonally, a piece of the opponent behind which is a free square, he is OBLIGED to jump over the opponent’s piece and occupy that free square. That particular piece of the opponent is taken from the board. This total operation is the capture by a man"
"4.2. Whenever a man meets, diagonally, a piece of the opponent behind which is a free square, he is OBLIGED to jump over the opponent’s piece and occupy that free square. That particular piece of the opponent is taken from the board. This total operation is the capture by a man"