Roman Key Card Blackwood
	The most common Blackwood used among experts today. The king of trumps is defined as the 5th ace. In addition we can check if the queen of trumps is among our armoury.
	The answers to 4NT (Roman Key Card Blackwood):
	5C = 0 or 3 aces
	5D = 1 or 4 aces
	5H = 2 aces denying queen of trump
	5S = 2 aces and the queen of trump
	A follow up of 5NT after 4NT (Roman Key Card) is confirming all key cards, asking partner to cuebid lowest king.
	Example 1:
	K Q 9 7 5	A 6 4 2
	A 3	K J 10 8
	K J 10 4	A 3 2
	Q 3	K 2
	1S	2NT = Jacoby
	3D	3H = cuebid
	4H = cuebid	4NT = RKC Blackwood
	5S = 2 aces and the queen of trump	6S
	pass
	Example 2:
	A Q J 5 3	K 10 9 8
	3	A 10 8 2
	K Q 10 9 3	4 2
	10 2	A K 3
	1S	2NT = Jacoby
	3D	3H = cuebid
	4D = cuebid	4NT = RKC Blackwood
	5D = 1 ace	5H = queen of trumps?
	6D = yes, and king of diamonds	6S
	pass
	Example 3:
	A J 7 5 3	K 10 9 8
	4	A 10 8 2
	K Q 10 9 3	4 2
	10 2	A K 3
	1S	2NT = Jacoby
	3D	3H = cuebid
	4D = cuebid	4NT = Roman Key Card Blackwood
	5D = 1 ace	5H = queen of trump?
	5S = no	pass
	Example 4:
	A J 7 2	A K 8 2
	Q J 3	A 10 8 2
	A 10	K 3 2
	K 8 7 2	Q J
	1NT = 15-17	2C = Stayman
	2S = 4 c spades	4NT = RKC Blackwood
	5H = 2 aces, no queen of trump	5S
	pass
	Example 5:
	A J 7 5 3	K Q 9 8
	K 4	A 10 8 2
	K Q 10 3	A 2
	10 2	A K 3
1S	2NT = Jacoby
3D	3H = cuebid
4D = cuebid	4NT = Roman Key Card Blackwood
5D = 1 ace	5NT = please cuebid lowest (unshown) king
6H	7S
pass