The difference is that a strong attack is a direct attack, and a dark attack is a sneaky opportunity to attack. Water fish is a kind of poker play, is a kind of Nanning area than the size of the play, dark attack that all four cards cover, is psychological warfare, the dealer does not know what your card, do not know can not beat you, strong attack is to cover the three turn over one or turn over the three to cover one, strong attack that go to kill do not believe, the loser doubled.