Roman Key Card Blackwood 1430
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Dealer:
West
W | N | E | S |
1NT | Pass | 2♣ | Pass |
2♠ | Pass | 4NT | Pass |
5♣ | Pass | 6♠ | End |
In RKCB, the aces and the king of trumps are all regarded as 'key cards'. Responder reports the number of these key-cards with standard response bids.
5♣ 1 or 4
5♦ 0 or 3
5♥ 2 (or 5), without the queen of trumps
5♠ 2 (or 5), with the queen of trumps
This is called Roman Key Card Blackwood 1430.