Over my 2diamond partner bids 2heart (fourth-suit forcing) and I show my extra strength by jumping to 3NT. (The reverse of 2diamond showed that I have a good hand but not as good as I actually do have). Partner considers this and then bids 4NT. That obviously is NOT Blackwood as there has been no suit agreed - it is a quantitive raise of No-trumps, asking me if I fancy a slam. Well, with all these top cards I can hardly refuse such an invitation so I bid 6NT. In tabular form the bidding has been:
  South        West        North        East  
  1club     Pass     1spade      Pass
  2diamond       Pass       2heart*   Pass    
  3NT       Pass       4NT   Pass    
  6NT      Pass       Pass   Pass    
* Fourth suit forcing.

  Down Symbol