I don't have the hand record (I was playing in a series of Robot Rewards, and there's not much time between tourneys), but something approximately like this happened.
W N E S(me)
-- -- 1♥ 2NT
P 3♥ p 4♦
P 5♦ All Pass
3♥ was explained as showing a good hand with ♦ support. But in fact, it had 3 ♦ and 4 ♣. Why were we playing in our 8-card fit instead of our 9-card fit? Once it bid 3♥, I think anything else I could bid was a cue bid in support of ♦, so there was no way to get to clubs.
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cue-bid after Unusual 2NT
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