This article treats trial bids after natural simple raises of a major to the two-level. The objective is to differentiate trial bids that invite game from those that investigate a slam all while following a guideline: to reveal as little as possible about declarer’s hand in game auctions and precisely identify responder’s hand in slam auctions.
Two sequences will be studied here.
> Direct raise of a major-suit opening:
> Raise of responder’s major by opener. A typical sequence:
2- First sequence 1M-2M
Support of the responder’s major, sample sequence: