MarilynLi

the bidding goes: 1♣-1♥-1♠-2♥ dbl playing negative dbl, the 1S bid is known for 5 cards. do you think opener's dbl is a support dbl? I always thought support dbl was made when responder could have 4 or 5 card. But I am told the dbl here is support showing 3 cards and a rebid of 2♠ showing 4 card. if responder is known for 5 card ♠, why not play 2♠ rebid by opener for 3 card support, 3♠ rebid for 4 card support(LOTT) and leave the dbl for penalty? What is your thought?