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Defence to 1NT

Page 1

by David Stevenson

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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: AstroAsproAsptro
Short Asptro
Asptro
Long Asptro
KASTRO
DblePenalties PenaltiesPenaltiesPenalties
2C H + C/D H + C/D/S H + C/D/shorterS H + C/D/longerS
2D S + C/D/H S + C/D S + C/D/shorterH 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: YesYesYesYes

Name:SharplesMod SharplesRocheRipstra
DblePenaltiesPenalties PenaltiesPenalties
2C Any hand with 4+S Any hand with 4+S Balanced, 12-14, 3+C H + S, better C than D
2D Any hand short in C Any hand short in C or C + D D H + S, better D than C
2H H H H H
2S S S S S
2NT     
3C C C C C
3D D D  D
ACBL GCC:   YesYes
EBU L2: Yes YesYes

Name:CansinoMod CansinoRevised CappellettiLandy
DblePenaltiesPenaltiesPenaltiesPenalties
2C C + D + H/S or
C + H + S
C + D + H/S or
C + H + S
D or
H/S + C/D
H + S
2D H + S D + H + S H + S D
2H H H H H
2S S S S S
2NT C + D C + D C + D  
3C C C C C
3D D D   
ACBL GCC:YesYesYes Yes
EBU L2:YesYes  Yes

Name:Original CRASH
Original CRO
Modified WallisRandy Mosher
Natural
DblePenaltiesPenaltiesPenaltiesPenalties
2C C + S or D + H H/S + C/D H + S C
2D C + D or H + S H + S D + H/S D
2H H H H H
2S S S S S
2NT C + H or D + S    
3C C    
3D D    
3H     
ACBL GCC: YesYesYes
EBU L2:  YesYes

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This article continues here

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Editor's note:

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