Quick summary

"Partner, I've got 3 cards in your suit".

By doubling the RHO overall, you the opener can distinguish between 3 and 4-level support for partner's suit.

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Doubles, Support double

Responder, I've got 3 cards in your suit

A support double is made by the opener after his right-hand opponent overcalls partner's response to the opening bid, and is used to say "I've got exactly 3-cards for your suit".

This helps to reduce the chance of getting a 4-3 fit, which is not a great fit at all, of course. The responder can then use this information to decide whether it's best to play in NT for example, if he had proposed a 4-card suit.

A support "redouble" achieves the same goal if there has been an intervening double from the enemy.

With 4 cards, not 3, the opener can bid the suit, of course.

Now try the quiz

Can you put all this into action ? Try the quiz for this subject by clicking on the link at the top left of the page, just below the main menu.
(You can try quizzes for any other subjects too while you're there. Look out for the thin red line).

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