Strong pass systems are mostly banned by World Bridge Federation and other governing organizations from all competitions except the highest-level ones, because opponents cannot be reasonably expected to cope with such an unusual approach.
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Highly unusual methods (also HUM) is a class of contract bridge bidding systems defined by the World Bridge Federation.
The Little Major is a bridge bidding system devised primarily by Terence Reese.
He won the Gold Cup in 1937, with teammates Maurice Harrison-Gray (Capt), S. J. Simon, Jack Marx (bridge) and Colin Harding, and authored a book, Bridge is an Easy Game which contains a description of the Acol bidding system.
First with Schapiro and then with Jeremy Flint, Reese created the bidding system as "an Awful Warning of what might happen if every country playing international championships were to arrive with its own wholly artificial system".