I'm a fan of the Berkowitz/Cohen structure here: 3♣ = 4441, 8-11 or stronger but quacky (e.g. not 4 controls), black stiff, 3♦ asks, then 3♥ = ♣ 3♦ = 4441, 8-11 or stronger but quacky (e.g. not 4 controls), red stiff, 3♥ asks, then 3♠ = ♦ 3♥ = 1=4=4=4, 12+/4 controls+ 3♠ = A solid 6+ suit, no outside controls. 3N = 4=4=4=1 12+/4+ 4C = 4=4=1=4 12+/4+ 4D = 4=1=4=4 12+/4+