Contributed by: Christine Karman - December 2003

The Muiderberg convention was named after the residence of one of the inventors. Openings of 2 and 2 indicate five cards in the opening suit and four cards in one of the Minor suits and about 6-11 points. The required strength depends on the the vulnerability. Not vulnerable against vulnerable, the player can do do almost any thing. Vulnerable against not vulnerable, the player needs to have the strength of 6-11 points to be in the long suits, especially in the Major suit.

When using Muiderberg, the player should not use the strong 2 and 2 openings. Instead, the player uses 2.

Responses to 2 :

Pass:	To play.
2 :	Non-forcing.
2 NT:	Game-forcing and asks for the Minor suit.

The Responses After 2 No Trump:

3 :	A 4-card Club suit.
3 :	A 4-card Diamond suit.
3 :	A 5-card Club suit.
3 :	A 5-card Diamond suit.
3 NT:	A 4-card Club suit and a 4-card Diamond suit.
4 :	A 6-card Club suit.
4 :	A 6-card Diamond suit.

Reponses to 2 :

Pass:	To play
2 NT:	Game-forcing and asks for the Minor suit
3 :	Minor suit choice for opener, who should pass or bid 3
3 :	Invite to 4 Spades
3 :	Invite for 4 Hearts
3 :	To play. Partner will pass

The Responses After 2 No Trump:

3 :	A 4-card Club suit.
3 :	A 4-card Diamond suit.
3 :	A 5-card Club suit.
3 :	A 5-card Diamond suit.
3 NT:	A 4-card Club suit and a 4-card Diamond suit.
4 :	A 6-card Club suit.
4 :	A 6-card Diamond suit.

Note: Every other bid is natural.

If the opponents enter the bidding process, then the responses are different:

After Double:

Redouble:	Shows 10+ points. You want to play.
2 NT:	Asks for the Minor suits.
Any other bid:	To play.

After an Overcall:

Double:	Penalty Double.
2 NT:	Forcing. Opener bids Minor suit and after that, 3 or 3 is inviting.
Any other bid:	To play.

 

 

If you wish to include this feature, or any other feature, of the game of bridge in your partnership agreement, then please make certain that the concept is understood by both partners. Be aware whether or not the feature is alertable or not and whether an announcement should or must be made. Check with the governing body and/or the bridge district and/or the bridge unit prior to the game to establish the guidelines applied. Please include the particular feature on your convention card in order that your opponents are also aware of this feature during the bidding process, since this information must be made known to them according to the Laws of Duplicate Contract Bridge. We do not always include the procedure regarding Alerts and/or Announcements, since these regulations are changed and revised during time by the governing body. It is our intention only to present the information as concisely and as accurately as possible.