2© Opening: Muiderberg (Dutch Two)  

5-10 HCP, 5 cards in  hearts and 4+ cards in a minor

    2ª - 6+ cards, non-forcing

         raise with fit

    2NT - game forcing asking bid

        3§/¨ =4+ cards

         3© - 5+ clubs

         3ª - 5+ diamonds

         3NT - 0-5-4-4 distibution (spade void)

         4§ - 6+ clubs, 8-10 HCP

         4¨ - 6+ diamonds, 8-10 HCP

     3§- pass with clubs or bid diamonds

      3¨- invit. to 4©

      3©- preemptive

      3ª- 5+ cards, game forcing

      4§/¨ - splinter

      3 NT/4©/ª - to play

After interference:

2© - double:

       redouble - to play

       2NT - asking for minor

       2ª/3§/3¨- own suit, sign off

       3©- preemptive

      4§/¨ - suit + fit

2© - 2ª by opponent:

      double - penalty

     2NT - asking for minor or invit to 4©

       3§/3¨- own suit, sign off

       3©- fit, competing  

      3ª- splinter

       4§/¨ - suit + fit

After other interference:

      double - penalty

     other bids the same as with no interference

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