Responder has opening values and a fit in the Major suit opening of his partner. The bids and the significance of the bid.
4
shows one of 3 hands.
If opener is interested he bids 4
to ask.
The responses are:
Shows the King of Hearts, the trump suit.
Shows a void/singleton in Spades.
Shows a void/singleton in Clubs.
Shows a void/singleton in Diamonds.The other other bid available in this system is 4
which informs partner that they have 13-15 points, 4-card trump support and two
Aces, and none of the above.
If you and your partner wish to employ this treatment, then it must be noted on your Convention Chart. Your opponents have a right to know the meaning of your bids. Please be so kind as to inform them.