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barmar, on 2025-June-06, 12:56, said:
Why does it matter that the 1♣ opening could be short? The only change to agreements I generally make regarding defending short minor openings is whether overcalling in opener's suit is natural or artificial. Is it common to change the aggression style as well? Why, to make it harder for the opponents to find out what kind of opening it was?
I agree strongly around here, where the "could be short" opening is always balanced if short, 2 cards only in 4=4=3=2 (so very similar to a 3+ "natural" opening in ACBL land). A few kamikaze will overcall 2♣ natural, but that is neither frequent nor (I feel) logical. I think only a poor pair would take our 2+ as a reason/excuse to get aggressive. That may change now that 1+ clubs and 5+ diamonds is all the rage, at least nearby.