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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:

Response Meaning
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.


Roman Blackwood was created by the famous Italian Blue Team in the 1960s.

See also

  • 5NT Pick a Slam
    A conventional 5NT bid that asks partner to choose a small slam.

  • Baby Blackwood
    A conventional 3NT ace-asking bid after a major-suit fit is found.

  • Blackwood
    The original 4NT convention invented by Easley Blackwood to ask for aces.

  • Exclusion Blackwood
    A variation of Roman Key Card Blackwood that's used with a void.

  • Gerber
    The convention for asking for aces in no-trumps slam auctions.

  • Grand Slam Force
    A 5NT bid as a conventional grand slam try.

  • Roman Key Card Blackwood
    A popular variation of Blackwood that asks for aces and the king of trumps.

  • DEPO
    A conventional Blackwood or Gerber response after interference: Double = Even, Pass = Odd.

  • DOPI
    A conventional Blackwood or Gerber response after interference: Double = 0, Pass = 1.

  • ROPI
    A conventional Blackwood or Gerber response when the opponents double: Redouble = 0, Pass = 1.