First, West doubled the one no-trump opening, which by partnership agreement showed a long suit somewhere in the hand.

South played in three hearts after a one no-trump opening and another transfer response.

In the auction shown, the no-trump opening and the double were both slightly eccentric.

The two no-trump opening showed a minor two-suiter with 5-10 points.

Bidding in the face of a one no-trump opening presents problems.

That is because many hands with four diamonds qualify for a one no-trump opening.

In the other case it showed a minimum of 15 since a one no-trump opening would have been weak.

South has a standard two no-trump opening bid, and North naturally raises to game.

In the auction shown, North advertised 10 to 12 points with his one no-trump opening.

He used a weak no-trump opening, and his partner raised him to game.