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Weissberger Convention

Used especially in Acol Bidding System. In 1 NT openning, after 2 Diamonds response to Stayman, 3 Diamonds asks 3 cards of major. In order to apply this convention you should have 5 cards of Spades and 4 cards of Hearts and HCP enough to play 3 NT. The answers are as follows.

Opener

Responder

Opener

Responder

Opener

Explanation

1 NT

2 Clubs

2 Diamonds

3 Diamonds

3 Hearts
3 Spades
3 NT
4 Spades
2 cards of Spades, minimum points
3 cards of Spades, minimum points
2 cards of Spades, maximum points
3 cards of Spades, maximum points

You can not use this convention when you have 5 cards of Hearts and 4 cards of Spades. However you could use in all situations with a small variation. Opener's high card points are not so important in this level because, since you have HCP enough to play 3 NT, you will play 4 major if you could find fit. Then the answers could be as follows.

Opener

Responder

Opener

Responder

Opener

Explanation

1 NT

2 Clubs

2 Diamonds

3 Diamonds

3 Hearts
3 Spades
3 NT
3 cards of Hearts
3 cards of Spades,
3 cards of Spades, 3 cards of Hearts

            After 3 NT rebid of opener, responder may apply transfer to his 5 cards major.