 The challenger receives no penalty (point deduction or loss of a turn) no matter if the challenged play is valid or invalid.A suggested flaw of this is that a player can challenge any word at any time, even words he knows to be valid; since tournament games are usually timed, this can be used to unfairly gain additional time to think about his own next turn.In penalty challenge (also known as modified single challenge, 5-point challenge, or 10-point challenge), a fixed number of points for the penalty is agreed on before the game, either by the two players or more often in tournament play, by the director(s).