With the queen he jumps to six of the major. Roman Key Card Blackwood 2. 0 or 3 key cards 3. Roman Key Card Blackwood 2. 1 or 4 key cards 3. No A partnership should decide what the 5NT rebid by the RKC bidder shows.
Most experts use it to ask for the cheapest king.
Responder is interested in game, normally has a five-card major suit and wants to know if opener has support. New Minor Forcing is OFF in competition. 2H is artificial and a game-force. While 1S is forcing, it is not a game-force. When responder jump rebids the fourth suit.