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Defence to 1NT

Page 9

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:French
Marvin
[Strong NT]
1 Suit OvercallsVroomKent
Dble H or D + H
or C + D + H
D or C + H H or H + C/D H or H + C/D
2C S or H + S
or D + H + S
H or D + H S or S + C/D C + S
2D C or S + C
or H + S + C
S or H + S H + S D + S
2H D or C + D
or S + C + D
C or C + S 4H + 5C/D H + S
2S Weak S D + S 4S + 5C/D S
2NT C or D Big two-suiter C + D C + D
3C C + H C + D C  
3D D + S   D  
ACBL GCC:YesYesYesYes
EBU L2:  YesYes

Name:Narre 84WONT Transfer HamiltonMulti-Landy-Astro
Dble 6H or 4H + 5C/D/S 14+, C or 18+ HCP or
14+, 2 or 3 suiter not very distributional
C or C + H/S
or H + S
S or 5C/D + 4H
2C 6S or 4S + 5C/D/H D or H + S/C/D D or D + H/S H + S
2D 5H + 5C/D/S H or 4H + S/C H or
H + C/D [strong]
H or 5C/D + 4S
2H 5S + 5C/D S or 4S + C S or
S + C/D [strong]
5H + 4C/D
2S Any strong two-suiter S + C/D 4S + 6C/D 5S + 4C/D
2NT C C + D C + D C + D
3C D C 4H + 6C  
3D   D 4H + 6D  
ACBL GCC: YesYes 
EBU L2:    

Name:PiperSOONNicoleRobinson
Dble 4H + 5C/D/S or
22+ balanced
H + S or good S C or S or D + H C or D or
5C/D + 4H/S
2C 4S + 5C/D/H or
19-21 balanced
H or 5H + 4C/D D or H + S H + S
2D H or S or 16-18 balanced 5/4S + 4/5C/D H or S + C H or S
2H 5H + 4C/D 4H + 5C/D H + C H + C/D
2S 5S + 4C/D weak S S + D S + C/D
2NT C + D C + D C + D C + D
3C C   
3D D   
ACBL GCC: Yes  
EBU L2: Yes  

Name:Petra (strong NT)Packo  
Dble C + D or D C or H + S or
5D + 4H/S
  
2C D + H or H D or 5C + 4H/S   
2D H + S or S H or S  
2H H + C H + C/D   
2S S + C/D S + C/D   
2NT     
3C     
3D     
ACBL GCC:Yes   
EBU L2:    

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Editor's note:

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