[bav]

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rules says that if you show one card anyone can ask to see the second one and the dealer should enforce this if asked.

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Now THAT is a rare and moronic rule.

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Not so rare anymore. Before the WSOP this year Harrah's ran around poker room to poker room in Vegas to "standardize" a few things and one of those was the enforcement of this new (I think it's new) rule. Show one show both is the rule of the land in Harrah's casinos (last I checked...haven't seen this actually enforced in a while).

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Do you mean this for a hand that is eligible for showdown or a hand where a player didn't have to show any cards (i.e. everyone folded to a bet) and he shows one out of courtesy?

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84. At the end of a hand, if a player exposes one hole card, he or she must also show the other hole card if asked to do so by any player.

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They wouldn't have needed a separate rule to cover this if it was only at showdown, since at showdown anyone can ask to see both cards at any time. This is at anytime.