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Defence to 1NT

Page 2

by David Stevenson

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This article is continued from here

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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, 2H/S are natural.
Page 3 Double is for penalties, 2H/S show 2-suiters.
Page 4 Double is for penalties, 2H/S show varied hands.
Page 5 Double shows a one-suited hand.
Page 6 Double shows a two-suited hand, 2H/S are natural.
Page 7 Double shows a two-suited hand, 2H/S show varied hands.
Page 8 Double shows a varied shape hand, 2H/S are natural.
Page 9 Double shows a varied shape hand, 2H/S show varied hands.

Note that D or H + S means diamonds or the majors, and not a red suit plus spades, which would be expressed as D/H + S.

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.

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Name:Mirror Hamilton  Roth-StoneKelsey
DblePenalties PenaltiesPenalties
2C S/H + C/D   C + S C + S + D/H
2D H + S   D + S D + H + S/C
2H H   H H
2S S   S S
2NT C + D    
3C     C + H  
3D     D + H  
ACBL GCC:Yes YesYes
EBU L2:  YesYes

Name:RCO [Weak NT]Kirmar No nameAuby
DblePenaltiesPenaltiesPenaltiesPenalties
2C H + S or C + D C or D or S + C/D/H D or 4H/S + 5C/D H + S
2D D + H or C + S D H + S H or S, 8-11 or 16+
2H H H H H, 12-15
2S S S S S, 12-15
2NT C + H or D + S   C C + D
3C    C + D C
3D    Game force 2-suiter [not C + D] D
ACBL GCC: YesYes 
EBU L2:    

Name:CollinsBecker RodwellHalf-Astro
DblePenaltiesPenaltiesPenaltiesPenalties
2C C + D C + D S + C/H H + S
2D H + S H + S D + H/S S + C/D
2H H H H H
2S S S S S
2NT H + C/D    
3C C + S C    
3D  D    
ACBL GCC:YesYesYesYes
EBU L2:YesYesYesYes

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This article continues here

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Editor's note:

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