Roman Blackwood

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Not to be confused with Roman Key Card Blackwood, Roman Blackwood is a version of Blackwood based on the rank and colors of the four aces. Its conventional responses to a 4NT ace-asking bid are:

5 0 or 4 aces

5 1 or 3 aces

5 2 aces of the same color or rank

5 2 aces of dissimilar color and rank

Specifically, the 5 response shows one of the following pairs of aces:

A and

A (the black aces)

A and

A (the red aces)

A and

A (the minor suit aces)

A and

A (the major suit aces)

And the 5 response specifically shows either:

A and A
A and A

A 5NT rebid by the 4NT bidder is king-asking, the responses to which are normal Blackwood responses. 6 shows 0 or 4 kings, 6 shows 1, 6 shows 2 and 6 shows 3.