I can't think of a single casino cash game that I have played in where the player that is shipped the pot after the other player mucks HAS to show his cards as detroitjunkie describes.
As for tournaments, I believe that the WSOP is one of the only tournaments that require what junkie mentions. But, the WSOP does not follow TDA, they have their own rules.
In fact at my local casino, I had the same situation in a tournament there last Friday. I was NOT required to show after the player I called mucked. I would have had the floor been called and they ruled I had to, but they were not called. But since my casino goes by TDA, they wouldn't have made me.
From TDA Rules :
"16: Non All-In Showdowns
A: In a non all-in showdown, if cards are not spontaneously tabled or discarded, the TD may enforce an order of show. The last aggressive player on the final betting round (final street) must table first. If there was no bet on the final street, the player who would act first if it were a betting round must table first (i.e. first seat left of the button in flop games, high hand showing in stud, low hand in razz, etc.).
B: A non all-in showdown is uncontested if all but one player mucks face down without tabling. The last player with live cards wins and he is not required to show his cards."
I believe that the WSOP is one of the only tournaments that require what junkie mentions.
Once he mucked and you showed, both of you violated a rule, therefor my feeling is they cancel out, you are accepting that he has mucked when you show out of turn.
At the WSOP, you MUST show cards to win ANY pot no matter what if it reaches showdown, and a lot of casinos use this rule too, its part of the anti-collusion mindset of rules
Does that apply to a checked down river as well?
As in: should Ivey still have been awarded the pot here:
Ivey mucks winning flush
I stand corrected - as of 2016 the WSOP no longer demands you show your hand if you have the only live hand remaining, even in tournaments. This was a rule change this year due to player complaints. Also gone is the ability to ask to see a hand if you no longer have a live hand, and only if collusion is expected, and with a floor present. Looks as if the players won one here, as they typically do.
Any casinos which operate under Caesars Entertainment (which are a ton) will have already adapted the new rules. So yes, now there are very few casinos that will use the must show rule in cash or tournaments anymore if all others fold (however, you will now more than likely get a penalty if you muck at showdown when the other person asks you to show)
Since your opponents cards were the only live hand left he automatically wins the pot & does NOT have to show. If he is inexplicably made to show then you have run into a card game that is extremely poorly run by people who don't know the rules of the great game of poker.
I have to disagree with you on a few points. U say at the WSOP that U must show on the river & that isn't correct. I did see later on U posted a retraction of your statement saying you were incorrect. For many years I have watched the WSOP on TV & not once have I seen it where a player HAD to show his cards on river after everyone has mucked. I am glad he admitted his mistake.
Also if the player wants to see the person's mucked hand that mucked hand does NOT become live again. If the hand is easily retrievable from the muck then the dealer will retrieve the cards tap the cards face down into the muck pile & declare that hand dead & then flip over the cards.
If you folded, he can muck, imo.
Well SIR I do know & why not use TV as an example since it was showing WSOP events & WSOP events is what you were referring to. Since it is a rule it should ALWAYS be followed for uniformity across all stages of poker & poker rooms. What gets people in trouble is when a rule is NOT enforced. For example on Friday night I am not forced to show my hand, but the very next night in the same poker room at the same table I am FORCED to show my hand. I have had rules that were enforced/not enforced a cornucopia of times & it gets frustrating when a dealer won't do his job. It sounds like U dealt at the WSOP so I desperately hope you are 100% uniform in your enforcing of the rules every single time or otherwise it is the most unfair thing you could do to a player.
You also say they won't make it a point of not showing it on TV because it's pointless. Why is it pointless to show the rules of poker being enforced on TV. Why is it pointless to show the actions of a normal poker hand on TV?
I will emphasize again that I have watched a plethora of WSOP events & not once has the ONLY live remaining hand ever been made to show.
I have asked to see other people's cards when I thought collusion was happening. When the river card was dealt I informed the dealer I wanted to see a player's cards so don't let him muck. They called over the floor & even though I was allowed to do that the floor informed me this was NOT a rule to be exercised often. He wouldn't allow it many more times.
You also say they won't make it a point of not showing it on TV because it's pointless. Why is it pointless to show the rules of poker being enforced on TV. Why is it pointless to show the actions of a normal poker hand on TV?
For what it's worth one thing that you WILL consistently see on TV (because it's something the players do, not the dealers) is string betting. It's against the rules in every poker room in the world as far as I'm aware, but you very rarely see it enforced. Maybe (this goes to my point above) that's because enforcing it 100% in a televised table would make for bad TV. But if all rules should be enforced uniformly 100% of the time, surely that's of great concern to you too?