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No offense but you're completely wrong here Shnarf. While you are right, the ruling is obvious, the ruling you think is obviously correct is actually wrong. In every tourney I've ever played in, and according to any official tourney rules I've read, when the pot is headsus a player may expose his/her hand at any time. Since it was folded around, this player may show his cards before calling.

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Well then you have never read the TDA rules. Under TDA rules even heads up with no further action to come from another player, a player may not expose his cards. However under TDA rules the hand would not be dead, exposing the hand MAY result in a penalty (time away from the table) but not a dead hand.