Baby Blackwood
The origin of this conventional method is unknown. This concept was developed over the years by partnerships to conserve bidding space, especially one level of bidding space, to achieve the exchange of additional information before establishing the final contract. Sometimes, there are some bridge hands which are immediately slam-suspicious.

Blackwood After Interference - If the opponents dare to interfere with the bidding after you initiate the Blackwood convention, you have several choices to show your number of Aces. There are several devised conventions to show your strength, such as: DEPO, ROPI, PODI, DOPI, DOPE, RIPO.

Blue Team Responses - A variation on the Blackwood convention devised by the Blue Team of Italy and also the variation on the Blackwood convention called the English Roman Blackwood.

Byzantine Blackwood - A complex variation of the Blackwood convention using Side Suits and Half-Side Suits as features.

Cheap Blackwood - A variation of the Blackwood convention to allow more bidding space for the exchange of descriptive information.

Culwood Convention
This conventional method was developed by Mr. Thomas Bigelow after Mr. Easley Blackwood developed and popularized the original Blackwood convention. The designation derives from the combination of the two words Culbertson and Blackwood, thus Culwood. This method is a variation based on a combination of the Culbertson Four-Five No Trump conventional method and the original Blackwood convention, which is an artificial bid asking for Aces. The Culwood convention is also a method of attempting slam based on the 4 No Trump bid by either partner.

Ekrens RKCB or Ekrens Roman Key Card Blackwood - The Ekrens bidding system uses Roman Key Card Blackwood, RKCB, as its first and main tool for slam-going purposes. This is written in a .pdf file format, and will be automatically opened by your browser.

Exclusion Keycard Blackwood - A form of Roman Key Card Blackwood in which partner is asked to show Aces and/or Key Cards except in a particular suit, which has been determined to be a void. This convention is also known as Voidwood.

Kantar Six Ace Blackwood - Kantar Six Ace Roman Keycard Blackwood
This conventional variation of the Six Ace Blackwood convention was devised by Mr. Edwin Kantar, and published in his book Roman Keycard Blackwood. Mr. Edwin Kantar has written four books devoted to the subject of Roman Keycard Blackwood.

Key Card Blackwood - A variation of the Blackwood convention, which shows the four Aces and the King of trump. Also known as Five-Ace Convention.

King Relay Blackwood - The origin of this variation is unknown. This variation of the original concept of Blackwood pertains only to the method for asking for Kings once the trump suit has been either established or definitely implied. This is accomplished via a Relay Bid.

Lillois Gerber / Lillois Blackwood / Lillois Ace-Asking Convention
This variation was devised by Mr. Pierre Ghestem of France, a bridge expert and published author. This particular designation is possibly a French derivation of the town in France called Lille, where Mr. Pierre Ghestem was born. Although the Ace-Asking bid is the same as the Ace-Asking bid in the Gerber convention, the conventional method is also referred to sometimes as Blackwood and/or Ace-Asking. This variation of the original concept of the Gerber convention provides the partner with the information about the rank and the color of the Aces.

Minorwood Convention
The origin of this variation of the Blackwood conventional method is unknown. As the designation signifies, this variation is only employed when the established or inferred trump suit is a Minor suit.

Progressive Key Card Blackwood
This conventional method was developed by Mr. Jean Marc Roudinesco of Paris, France, (1932 - 2001), author, bridge theorist. Via step responses the partnership can show the number of Key Cards, followed by King-asking bids, followed by Queen-asking bids.

Rolling Blackwood or Sliding Blackwood - Rolling Blackwood, or Sliding Blackwood, is a variation of the Blackwood convention. It takes into account that two partners could reach an unsafe contract in the Minors using the normal Blackwood convention.

Roman Blackwood - This convention is a variation on the concept of Mr. Easley Blackwood and shows matching Aces and Aces of the same color and/or rank.

Roman Key Card Blackwood - This variation of the Blackwood convention includes the King of Trump as a fifth Ace, and the responder shows Key Cards.

6-Ace Roman Key Card Blackwood - This conventional method, otherwise known by its abbreviated designation 6A-RKCB, is considered to be a natural extension of the concept known as Roman Key Card Blackwood, whereby the Key Card Bidder asks for five known Key Cards. However, the 6A-RKCB conventional method asks for eight known Key Cards, the four Aces, the two Kings, and the two Queens. The one difference is that the Roman Key Card Blackwood conventional method applies to only one known suit fit, whereas the 6A-RKCB conventional method applies to two known suit fits.

RKCB Void Showing Variation - This variation of the original conventional method was developed by Mr. Chip Martel and Mr. Lew Stansby to show a void in addition to the number of held Keycards. This variation employs different responses if the void has been established in advance during the auction.

Roman Key Card Blackwood 1430 Convention - A variation of Roman Key Card Blackwood which reverses the meaning of two responses.

Voidwood Blackwood - A form of Roman Key Card Blackwood in which partner is asked to show Aces and/or Key Cards except in a particular suit, which has been determined to be a void. This convention is also known as Exclusion Keycard Blackwood.

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