Three level Jump Cue Bid 
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After the opponents open one of a suit, a jump cue bid shows a strong 
one-suited hand with at least 8 1/2 tricks.  For example, after a 1C 
opening, a 3C cue bid would show a hand like A.xx.AKQxxxxx.xx

Responder (who cannot pass) responds
	
 1) 3NT with a stopper in the enemy suit
 2) cheaper minor: no stopper and weak  } weak = denies three controls
 3) higher minor: no stopper and strong }         where A=2, K=1
 4) any major: no stopper and good 6 card suit (forcing if below game)
 5) higher NT: multiple stoppers in the enemy suit  

Variations:
 A. Some play that a jump cue of a minor is natural and preemptive.
 B. Some play this jump only shows a long minor, not a major.