Jump responses at two-level to one-level suit openings are slam tries. Since there is no chance for opener to show his limit, the player who made the jump response must have a standard hand and describe his distribution with his rebid. The jump responses can be used with limited strength and either single suited hands or balanced hands with good five-card suit. In addition, it is possible to use the jump response with good five-card suit and fit to the opening suit. Jump response with two suited hands beside the opening suit creates problem by narrowing the bidding space and not giving chance for each side to show their limits. It is best to start the bidding at one-level with this type of hands.
Opener rebids his long suit or shows his second suit with 5-5 holding over partner’s jump to two-level. He can support responder’s suit with a good hand and either three card or Hx support, otherwise he can bid 2NT waiting for responder to make a descriptive rebid. Even after 2NT rebid, three cards support will be shown by returning to responder’s suit at the first chance.
Opener with 2-4-5-2 distribution may have rebid issues over responder’s jump to two level in his two card major suit. In this case, he should rebid 2NT with Hx holding in the other two card suit, rebid his good five card suit or bid his good four card suit as if he has 5-5 holding. He may bid 2NT with Hx is responder’s major and xx in the other two card suit. In this case, he should support partner at the first chance.