Dutch Doubleton

This is a Multi-way Club system, and 1 is forcing. It still promises a doubleton in all variants (some people also include the bothersome 4441 with short ).

Opening bids

1
  • 12 - 14 balanced
  • 18 - 20 balanced
  • 12+ HCP, 4441, not short
  • 12+ HCP, 5+
    		•
    1 12+ HCP, 5+ or 4 4 4 1
    1 12+ HCP, 5+
    1 12+ HCP, 5+
    1NT 15 - 17 balanced
    2
  • GF
  • 23 - 24 balanced
  • Weak Two in
    • 2 Multi: Weak Two in /, 25 - 26 balanced or SemiForcing /
    2 Muiderberg: Weak 5 4+ /
    2 Muiderberg: Weak 4+ /
    2NT 21 - 22 balanced