thanks awm. It is cleared on question 1. 2) if 1S-2D (forcing) -2S (<15pt, 5card, mini responded to forcing). Then, it is not forcing, am I right? Surely responder can bid 2NT to stop it. any new suit is another forcing for opener to bid, am I right? 3) In SAYC, 1S (5 card major) -2D (forcing) -2S bids show 5 card or 6 card of S suit?