Re: Rare semibluff c/r
I think my major consideration here is that you are very unlikely to fold a pair heads-up in a blind battle here, and hence this is not a great spot to check-raise. Much of the time that you get a fold, you are folding an inferior hand anyway (a worse A, some gutshot + overcard thing, etc...).
Checking and calling here is probably best unless you have a very specific reason to think either: a) villain will fold a pair; b) you are ahead.
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