Extract from the White Book: Section 172 Level 5 Permitted Conventions [C3+L4] 171
172.4 Encrypted Signals |
Additional to the restrictions on bidding methods and conventions above, players may not use signalling methods by which the message or messages conveyed by the signals are hidden from the declarer because of some key available only to the defenders (ie encrypted signals are not allowed) |
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Section 172
- Definitions
- Highly Unusual Methods (HUMS)
- Brown Sticker Conventions & Treatments
- Encrypted Signals
- Random Openings
- EBU Level 4 Conventions
- Convention Cards
- Other Articles