First, West doubled the one no-trump opening, which by partnership agreement showed a long suit somewhere in the hand.

Bid another suit first at the lowest level, show a long or a strong suit.

South's five-diamond bid, in the teeth of the vulnerability, certainly shows a long, strong suit and a good hand.

Some use it as a splinter to show a short suit with no major.

Four spades showed a solid suit and asked South to cue-bid.

South lands in four spades after West has shown a long, strong heart suit.

The opening bid was one heart, which purported to show a five-card suit.

Robinson as West opened four diamonds, an artificial bid which in his methods showed a very long solid major suit.

In this sequence, West's double showed a long minor suit.

Following the strong jump shift response, South showed a solid suit by jumping in his turn.