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.

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