Posted 2018-February-11, 19:28
No, if 3♦ is weak then 3♠ already shows some life and if you have enough for that you just bid 4 or something.
Dbl is needed to show a flexible hand without primary support. Typically two spades and 4-5 hearts. But you will sometimes have to double with less perfect hands.
The world would be such a happy place, if only everyone played Acol :) --- TramTicket