Opener's jump rebid to four of original minor is strong raise. Unbid minor forcing and artificial after one-notrump rebid, requests support. Three clubs artificial, may be prelude to signoff, after two-notrump jump by opener. After a single raise in a major a reraise to three is preemptive. Repeat same-suit double by negative doubler for takeout.
Weak jump responses after overcall or double of minor opening.
Fit Showing Jump Shifts in Competition after overcall and doubles of an opening bid in a major suit. Support doubles and redoubles at one or two level when raise to next level is available. Jump cue-bid by opener is splinter raise. Pass and pull strong in forcing situation. Direct jump cue-bid natural over minor, asks stopper over major.