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Any defence to 1NT is permitted at ACBL MidChart and EBU Levels 4 and 5 (and the former Level 3, and Level 2 in fourth seat or after passing), so all of the following are permitted. The chart below also shows which defences are permitted at ACBL GCC, and EBU Level 2 (second seat).
|Pages 1 to 2||Double is for penalties, 2/ are natural.|
|Page 3||Double is for penalties, 2/ show 2-suiters.|
|Page 4||Double is for penalties, 2/ show varied hands.|
|Page 5||Double shows a one-suited hand.|
|Page 6||Double shows a two-suited hand, 2/ are natural.|
|Page 7||Double shows a two-suited hand, 2/ show varied hands.|
|Page 8||Double shows a varied shape hand, 2/ are natural.|
|Page 9||Double shows a varied shape hand, 2/ show varied hands.|
Note that or + means diamonds or the majors, and not a red suit plus spades, which would be expressed as / + .
If you want to print these diagrams see here for a printer-friendly set of pages without all the headings, and with only two diagrams per page.
|2||/ + /||+||+ + /|
|2||+||+||+ + /|
|Name:||RCO [Weak NT]||Kirmar||No name||Auby|
|2||+ or +||or or + //||or 4/ + 5/||+|
|2||+ or +||+||or , 8-11 or 16+|
|2NT||+ or +||+|
|3||Game force 2-suiter [not + ]|
|2||+||+||+ /||+ /|
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