Blind defense: Flopped overcards on a low board

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I'd only call if I expected him to give me a free river (if you frequently call flop bets and raise the turn this might hapeen somewhat frequently).

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I still think that you should call if he almost never gives a free card and, as assumed in OP, he shows down A high most of the time.

Your approch risks one sb to potentially win ~3.25BB, mine risks one sb to potentially win 5.25BB.

Besides, almost noone gives enough free turns in this situation to make a call profitable.