2§ - 2NT Opener may bid 3 of a major natural , 3¨ with 3 suiter or 3§ to ask suit.

Responder bids suit below suit (¨=©, ©=ª, ª=§, NT =¨) if opener then relays he asks for suit quality with 4 step response as follows

1^st step = KJ

2^nd step = KQ

3^rd step = KQJ

4^th step = KQJ10

If opener relays again it asks for suit length

3 step response = 6, 7 or 8 card suit