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Defence to 1NT

Page 8

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:TNT French Against NotrumpKleinman Against NotrumpMorgan Against Notrump
Dble C or D + H
or S + C/H
C or D + H
or S + C/H
C or D + H
or S + C/H
C or D + H
or S + C/H
2C C + H
or D + S
D or C + H
or D + S
D or C + H
or D + S
D or C + H
or D + S
2D D C + D + H/S
or C + H + S
4S + 5C/D/H 4H/S + 5C/D
2H H H H H
2S S S S S
2NT C + D C + D C + D C + D
3C     
3D     
ACBL GCC:YesYes Yes 
EBU L2:     

Name:JumpballMeckwellMod MeckwellBrooss
Dble C or good S or H + D/S C or D or H + S C or D or H + S C or D + H/S
or H + S
2C D or C + H/S C + H/S C + D/H/S C + H/S
2D D + S D + H/S D + H/S D
2H H H H H
2S Weak S S S S
2NT C + D C + D C + D C + D
3C     
3D     
ACBL GCC:YesYesYesYes
EBU L2:    

Name:MaestroStevenson type 1Stevenson type 2 Stevenson type 3
Dble C or D or 4H + 4S or
17+ HCP
C + D or D + H/S or
H + S
C + D or D or
H + S
C + D or
any 3-suiter
NOTEThese doubles were designed to work with Astro or Asptro. However, they may be used with other defences.
2C H + C/D H + C/D/longerS H + C/D/longerS H + C/D/longerS
2D S + C/D/H S + C/D/longerH S + C/D/longerH S + C/D/longerH
2H H H H H
2S S S S S
2NT C + D C + D C + D C + D
3C C C C C
3D D D D D
ACBL GCC: YesYesYesYes
EBU L2:     

Name:CANTMONK (Major Oriented Notrump Killer)  
Dble 14+, C or D or
14+, 4/4 H/S + other or 18+ HCP
C or D or 5332 with 5H/S or
17+ HCP
  
2C S + H/C H + S  
2D D or D + C/H/S 5H/S + 4C/D   
2H H H   
2S S S   
2NT Distributional C + H or
strong 2-suiter
   
3C C    
3D D    
ACBL GCC:Yes   
EBU L2:    

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Editor's note:

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