[2] Konstam, educated at Oundle School, was employed for a time as a stockbroker in the London Stock Exchange.
He served in the British Army during World War II, reaching the rank of Major.
[4][5] He was one of the proponents of a bidding system known as CAB, in which the responder to a strong artificial 2C opening immediately identifies an Ace in hand, if any.
The 'B' stood for Blackwood; otherwise, the system was mostly natural, with strong no-trump opening bids, and forcing jump raises as in the older version of Standard American.
Konstam also played rubber bridge, which for many years was a good source of income.