Blackwood convention Blackwood convention In the partnership card game contract bridge, the Blackwood convention is a popular bidding convention that was developed by Easley Blackwood. It is used to explore the partnership's possession of aces, kings and in some variants, the queen of trumps, to judge more precisely whether slam is likely to be a good contract. Two versions of Blackwood are common: "standard" Blackwood, developed by Easley in 1933, and "Roman Key Card" Blackwood ("RKC" or "RKCB"), named for the Italian team which invented it. Standard Blackwood enables one partner to count partnership aces and kings in general. Key card variants
Atlas E/F stages for ABRES and BMRS re-entry vehicle tests between 1965 and 1974. Three of these launches failed. Five ABRES launches were also conducted whilst the missiles were still operational, however these did not use the Atlas E/F configuration. An RM-81 Agena upper stage was used on a former Atlas-F, to launch the Seasat-1 satellite on 27 June 1978. This was the final flight of the Atlas-Agena. Previous Atlas-Agena launches had used Atlas D or Atlas SLV-3 rockets as first stages. The final Atlas - Agena was used on Atlas E/F. An Atlas E/F with an Altair-3A upper stage was used