Instead of a full-fledged bidding system, Watermelon Dutch Doubleton is a minimalist plugin for 5542 systems, specifically designed for 2/1 and SAYC.

• 1♣ - 1♦ = catchall relay
• 1♣ - 1M - 2♦ = artificial reverse
• 1♣ - 2♦ = FG, 5+♦, a natural adjunct

This book fits the following regulations:

1. Green (natural) classification under the WBF Systems Policy
2. ACBL Basic Chart
3. Optional agreements may require the ACBL Basic+ Chart.

Notation

This book follows Strawberry Polish Club for hand evaluation, bidding notation, and punctuation in tables and prose.

References

• Jan Eric Larsson. Good, Better, Best: A comparison of bridge bidding systems and conventions by computer simulation. ISBN 978-1771402415
• Thomas Andrews. Thomas’s Bridge Fantasia
• Bridge Base. GIB Bid Descriptions

Dutch Doubleton

• Dan Neil. Professional Dutch Doubleton Bidding System
• Sjoert Brink & Bas Drijver. (WBF convention card)
• Rosalind Hengeveld. Dutch Doubleton

Polish Club

• Chen-Pang He. Strawberry Polish Club
• Krzysztof Jassem & Tomek Brus. Polish Club 2020: Expert. ISBN 978-1771402248
• Krzysztof Jassem. Wspólny Język 2020 Standard
• Krzysztof Jassem. Polish Club International 2010