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Have you guys ever used this rule or seen it used?
The rule is:
If it is HU on the river, and one player says "you win" after all action has been completed, the other player can just muck his hand and take the pot with no showdown.
What is the purpose of this rule, other than putting me in a situation where someone will try to stab me in the parking lot?
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Here is an article that might be applicable here:
http://twoplustwo.com/magazine/issue35/angelo1107.html
If you have a hand, just flip your damn cards over. If you are the mucker variety, then you too someday will muck a winning hand and the floor will rule the pot to villain. And then you'll cry and I'll say I told you so.