The new responder's jump shift : 2 ♥ after a 1 minor opening
This convention is an answer for the responder holding 5
♠ and 4
♥ when the opener has rebid his minor suit. Without it, he wouldn't be able to find the right bid with a hand worth less than 10H :
- Bidding 2♥ on the second round who be a 3rd suit forcing
- You need 11H for 2NT...
- The responder knows the opener might have 4 ♥ cards, but he must pass...
With the 2
♥ jump shift, the opener precisely knows his partner's hand...and can decide what is next !