4NT for Kings

   

Kings are shown in the following 4 steps if responder's initial response was a positive:
  1. No Kings
  2. 1 King
  3. 2 Kings
  4. 3¦4 Kings
This response taken with the initial response to 2C allows the 2C opener to decode BOTH the number of Aces & the number of Kings held by the responder.
This 4NT request for kings is not available with any other opening bid.

If  the initial response to 2C was a negative or a break-out then the 4 step responses are  very different as follows:
  1. No Queen
  2. Q of trumps
  3. Q & J or T of trumps
  4. Q of trumps & a further useful Queen
After obtaining the number of Kings,  5NT  can be used  to  ask about Q's as in the 4 steps above.