Negative doubles occur when partner opens bidding, your right-hand opponent overcalls, and you have some strength but no other way to bid it.

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A veteran of more than 50 years competition, Dan Cabot has written a useful pamphlet called Duplicate Bridge for Beginners.

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Robert S. Todd teaches bridge, gives playing lessons, runs duplicate play on cruises, you name it. Oh, and he’s also an expert player.

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