2ª Opening: Muiderberg (Dutch Two)  

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

    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 4ª

      3©- 6+ cards, invit to 4©

      3ª- preemptive

     4§/¨ - splinter

     3 NT/4©/ª - to play

After interference:

2ª- double:

       redouble - to play

       2NT - bid your minor

       3§/3¨/3©- own suit, sign off

       3ª- preemptive

      4§/¨ - suit + fit

After other interference:

      double - penalty

     other bids the same as with no interference

 § ¨ © ª