Responder's follow on bids after X on a 1♦ overcall
On the following bidding round, Responder can describe his hand :
- after doubling, if he bids the suit which is ranked one level higher than overcalled suit, he promises 4 cards in the other major (♠) and a hand with no Game ambition. He can't have 5♥ cards, otherwise he would have bid them in the 1st round!
- If he bids the other major in the next round, it means he also has 4 ♠ cards and a hand to go for Game