I played no limit holdem with some business partners. Well, one hand came down to two players, player A and player B. Before the river, player A was hoping back then for a flush with clubs in the pocket and two on the table. Player B was already committed to pocket with QQ. River card came and good for player A as he got his flush. Suddenly, without betting or even checking, he showed his cards. A keen observer who was around since the start of the game said that he mucked. Later, he admitted his mistake that he had forgotten however everyone at the table believed then it was a muck. What do you think? And if in case no one went all in, what will be the verdict?

Thanks!

Schultz
Schultz,

This was not a muck. He just prematurely showed his hand. Action could continue as normal, but the other player would have added information.