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Originally Posted by checkraisdraw
If it’s specifically written into the rules that a player can show their hand when they close the action, I hardly see why it would be an angle.
I'm not exactly sure what you mean. RRoP mentions that showing your hand before action is complete is an ettiquette violation that may result in penalties.
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The following actions are improper, and grounds for warning, suspending, or barring a violator:
[...]
Revealing the contents of a live hand in a multihanded pot before the betting is complete.
According to RRoP, when heads up you can show your hand at any time, which actually is the rule in some rooms. I don't think there is any exception for closing the action before showdown - when multihanded I don't think this should be permitted even if you are last to act, because it can cause an outcome that is deleterious to the other players in the hand, even though they weren't involved.
TDA does also mention it, including specifically mentioning being last to act, but only to say that it may be penalized, but should not result in a dead hand. I guess maybe you could stretch the definition of "allowable" to include this, but it's definitely not recommended or encouraged, and it may result in being penalized.
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68: Exposing Cards and Proper Folding
Exposing cards with action pending, including the current player when last to act, may result in a penalty but not a dead hand. Any penalty begins at the end of the hand.