There are two different procedures for showdown, depending on whether there was a bet on the last street.
If there were no bets on the last street, everything is extremely simple. In this case, the order of opening the cards is the same as in the previous streets, starting with the place directly to the left of the button and further clockwise. The first player, who has cards, turns them face up. Each of the following players can do the same, but if he sees that he is not the winner of the deal, he can simply give the cards face down to the dealer.
However, if there were bets placed on the last street, the rules change. In this situation, the player who committed the last active action (i.e. bet or raise) must first show his cards. After that, everything goes clockwise, while the button's role does not play a role. By analogy with the previous paragraph, after that each player can choose between showing his own cards and dumping them in the dark.
The rules do not prohibit showing cards not in turn. Moreover, it is usually better for everyone if all those involved in the distribution instantly turn their cards over. The above procedures were developed just for those cases when none of the players showed any desire to show their cards first.
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