Some rules have evolved for the throwing of dice including no rolling of the dice from an open palm (Waterfall Technique), only tossing using the fingers. However, these are not used universally. If the dice leave the board, the IPS (International Playing Surface), accompanied by the call of "off the IPS" three times within the game this can be punished by losing the go up to all pieces home depending on which rules are being played. Unless the opponents deem it to have been done on purpose (for example to avoided moving a blob or mixing) then they may permit a re-roll.