Xiaolongnu, on 2012-January-30, 01:01, said:
I second 3♣ rebid 4♣. I also foresee an impossible bid sequence. What does 3♠ mean in this sequence. It would be best in the agreement that it means NOTHING, an impossible bid.
If playing regular Stayman then 2NT - 3
♣; 3
♦ - 3
♠ typically shows 4 spades and 5+ hearts (Smolen) while 2NT - 3
♣; 3
♥ - 3
♠ agrees hearts. Thus it is not an impossible bid.
I like to play 2NT - 3
♠ as showing clubs (6+ or 5-5 minors) and 2NT - 4
♣ as showing diamonds. This means that Opener is allowed to show club support over 3
♠ and also keeps 2NT - 3NT natural (no beers on me!)
If playing Puppet and choosing to start with 3
♣, then after a 3
♠ response I would have a choice between 4
♣ (natural) and 4
♥ (slam try in spades). Neither of these really helps here so starting out with 3
♠ seems best.
Of course if Opener can start with a strong club things get alot simpler. For my methods it would start 1
♣ - 1
♠; 1NT - 2
♦ where we have shown a 1-suited hand with clubs and 9+. Opener can now relay further with 2
♥, set clubs and start a cue auction with 3
♣, or (unlikely) just ask for key cards without any further investigation by bidding 4
♦.