I play: 1M: 2M: 3M, 5-9 2NT: 4+M, 10+ 3♣: 4M, 6-9 (usually balanced), mixed raise 3♦: 3M, 10-11 (by unpassed hand) 3M: 4+M, 0-5 1M-3♣ 3♦ is an asking bid, usually game-probe (3M with minimum, other with maximum) This structure I find very good because: a) You bid most thin games having 5-4 or 6-4 fit; :blink: You never invite aggressively after 1M-2M (and go down on the 3rd level); c) You can judge better the game aspects after 1M-(pass)-3♣-(Dbl/3♦).