We play 1♦ = 12-15 with 2+♦, not 15 ball, since we use 15-17 1NT 2♣ = 12-15 6+ ♣ or (5+♣ with 4M) 2♦ = 4404 or 4414 12-15 after 1♦, we use 2m as limit+ with 4+#m. The idea is we could use 1NT as "trash" 6-9 HCP, put balanced invitational in 2m, also put 5m4M game forcing hand in 2m so after 1♦ - 1M (6+, 4+M) 1NT 6-9 "trash" - balanced or long minor. 2m 10+ 4+#m, possible 5m 4M with GF hand after 1♦ - 2m, opener rebid are mostly artificial 2♦ 6(5)+ ♦ unbalanced minimum hand 2♥ balanced minimum (12-13) 2♠ unbalanced maximum with 4# in responder minor (14-15) 2NT balanced max (13-14) 3♣ unbalanced minimum with 4# in responder minor responder : any reverse in major is 5m4M hand, and rebid to minor after minimum hand is to play so far, we havent met any problem when playing this system, any thought ?