Roman Key Card Blackwood 1430

	N
W		E
W		E
	S

♠	A Q 4 3
♥	A K Q J
♦	A 8 7 3
♣	6

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.

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