With a two-suiter
If two suits have been called,
- the cue bid of the opening suit shows a two-suiter with 5-5 in the other two suits.
- 2NT shows a violent two-suiter with 6-5 in the other two suits.
If only one suit has been called (eg 1 heart - 2 hearts)
- the cue bid of the opening major shows the other major and the clubs.
- The jump to 4 clubs shows the other major and the diamonds.
- 2NT shows the two lowest ranking suits (except a fourth seat reopening bid)
2 ♠In fourth seat as in second, don't miss the opportunity of bidding a strong 5-card suit. You probably won't be able to do it later.