Fourth color

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The fourth color - Norman Squire's auction bridge, one of the most popular and most famous contemporary conventions.

The typical sequence of the fourth color is rebid by the corresponding second round of betting on a new, unquoted color - in the above example 2 ♥. The fourth color is artificial and forcing, usually shows the lack of stopping in the bundled color and asks the partner for a further description of his hand. There are many things you can do with the fourth color (one lap, tip) and different response patterns depending on the auction system used.

Fourth color setting examples:

wiki

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