Baron convention

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Baron is a set of conventions in the game of contract bridge. There are three common variations of the Baron convention used in the game.

Baron Three Clubs

The Baron Three Clubs is an alternative to the responder using Stayman over a 2NT opening bid. The responder will have 5 points or more and an unbalanced hand. The responder bids 3 clubs, which asks opener to bid his four card suits in ascending order. If clubs are the only 4 card suit, the opener then bids 3NT.

If there are two 4-card suits (one being clubs), the opener bids the higher first (then) 3NT for the clubs if no fit is found. The opener's 2NT is a limited bid and the responder has not shown the strength of his hand, therefore the responder will control how high the bidding goes, game or prospecting for a slam, and the suit to be played. The main advantage of this convention is that it becomes easier to reach minor-suit slams.

Baron Notrump Overcall

A 1NT overcall is used over an opponent's opening suit bid and shows a weak hand with support for the unbid suits (i.e. it excludes support in the opponent's suit).

Baron Two Notrump Response

When the opening is a bid of one of a suit, a 2NT response is given showing 16-18 points and a generally flat hand. 3NT shows 13-15 points. This is also known as the Two NoTrump Forcing Response.