FrancesHinden, on Dec 4 2007, 05:29 PM, said:
Thanks for the clarification. I have a bit of a problem with the "(or both)" part. If both have a penalty double then neither can make a take-out double which partner can then convert to penalties. That of course is worrying about catching an opponent's psych. But I grant that this is less likely than their having their calls, although if your opponents are adequately familiar with your doubling style it is more of an invitation to psych.
Perhaps there is some scope for artificial use of 2NT in these sequences (combined with double being for penalties in a forcing pass auction) - on the grounds that if you have a genuine 2NT bid then you likely have a penalty double so the 2NT becomes redundant in a natural capacity (either in direct seat or in response to a forcing pass). Not quite accurate of course - if you have a short guard and a source of tricks outside you might want to use 2NT as natural despite that double would have been for penalties.
As you say - possibly a bit beyond the BIL scope, but on topic in the context of the thread.

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ing) tr. v. - Any bid made by bridge player with which partner disagrees.