Byzantine Blackwood convention Byzantine Blackwood convention Byzantine Blackwood is a bidding in the game of bridge. Devised by Jack Marx, it is a complex version of the (by which a four notrump (4NT) asks about 's holdings). Its premise is that both aces and kings may safely be shown in response to a Blackwood-type 4NT enquiry; provided that such kings are in well-defined "key" or "half-key" suits, there being no more than two such suits. The name was chosen to express the idea that Byzantine Blackwood is a development from Roman Blackwood, by analogy with the Byzantine Empire and the Roman Empire; rather
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