[Warik]

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The Button should have the option of folding, calling, or raising on the river.

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He did have the option even though the SB flipped his cards early. I've even seen situations where the last player to act presented a wide smile and re-raised after seeing that the opponent's prematurely flipped hand was junk.

The debate here was that the Button did not raise, call, or fold. He simply exposed his cards as well since he knew he had the nuts. The argument presented by the SB was that he didn't call or raise so therefore that means that he folded, even though he flipped his cards, not mucked.

During the table argument in which everybody was involved (including me, since I was losing that night I might as well have some fun this way), everybody was defending the Button. SB became the butt of the jokes for the remainder of my session as whenever the last to act flipped a superior hand the loser would say "YOU DIDN'T CALL MY BET. YOU FOLD!" and everybody would have a laugh.

I would have gone apeshit too. If I had kings full they're either giving me the whole pot or giving it to the SB and asking me to leave.