[1] He went to Repton School, and served as a captain in the Royal Army Service Corps during World War II.
[citation needed] Marx was a member of the Harrison-Gray team, and played as Gray's partner to win the European Bridge League championship teams-of-four for Great Britain in 1950, but he turned down the chance to play in the inaugural Bermuda Bowl world championship the same year: Despite his temperament, Marx won the Gold Cup in 1937 and 1947, and once more in 1971 after Gray's death.
[7] Marx is often said to be the first player to devise the idea of bidding 2C over 1NT to ask for 4-card major suits, though it is known that Ewart Kempson had used it in the early thirties.
Others were involved in this – Harrison-Gray, Iain Macleod, Terence Reese, Ben Cohen – but Marx and Simon were at the heart of it.
[15] Reese's text discusses (p94/5) a sequence after North makes a take-out double of West's one diamond bid and South jumps to two spades.