“ In this game only the four knaves are trumps. If the hand playing grando thinks he can make all the tricks, he declares open grando—i.e. shows his hand. If in open grando a single trick be lost, the player loses the game. If one of the players holds such cards as to enable him to force his opponents to take all the tricks, he can declare nullo. But here the game is lost if even a single trick falls to the player. In nullo, the knaves are regarded as colour, i.e. are not trumps. Nullo can be played open, if there is no probability of the player taking a single trick. ”