The 2H and 2S bids are nonforcing. Here too an immediate raise by partner is preemptive. When partner bids 2NT, he is either asking for the minor or showing a limit raise. Based on this principle, the Roman Key Card convention modifies the responses to 4NT Blackwood by counting the king of trumps as an ace. If a major suit is trumps and responder bids 5C, the cheapest step bid by the RKC bidder asks for the queen of trumps.
Responder denies the queen of trumps by bidding five of the major.
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.