Non-Serious 3NT and Other Major Suit Structure Changes

The biggest change Gavin has made to his major suit slam bidding in the last five years: non-serious 3NT. When it applies, the three directions (fast arrival, non-serious and serious), the flip to non-serious 3♠ when hearts are trumps, when you are forced to cooperate, who drives past game when every suit is controlled, and how to handle the close decisions.

Plus the new major suit raise structure: the limit raise that now includes three-card support with a singleton, and the shortness ask/tell after limit raises, mixed raises and 1m–1M–3M.