If an opponent does not believe that the declare contract ("game") or bonus will be won, he can say ""Kontra!"". This doubles the value of the game or bonus. Games and bonuses can be "kontra'd" independently of one another. If the player thinks he can still win, he can double the value again with a ""Rekontra!"" ("Re", "Reh" or "Retour"). Depending on the rules agreed, the opponent can counter with a ""Subcontra!"" ("Sub", "Superkontra" or "Hirsch"), which now increases the value eightfold. Some rounds play with even more levels, such as "Mordkontra" which is worth x 16.