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Strength of a jump shift after opps double

#1 User is offline   helene_t 

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Posted 2015-November-04, 02:33

Basic robots.

1-(dbl)-2

This was just explained as "biddable diamonds". Is there a definition of the strength of this bid?
The world would be such a happy place, if only everyone played Acol :) --- TramTicket
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#2 User is offline   lycier 

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Posted 2015-November-04, 05:34

 helene_t, on 2015-November-04, 02:33, said:

Basic robots.

1-(dbl)-2

This was just explained as "biddable diamonds". Is there a definition of the strength of this bid?


Very very good question !
First let's look at basic Gib CC after double,it goes :


1= free bid,new suit --- 4+,8+TPs
1M= free bid,new suit --- 4+M,8+TPs
1N= free NT ---2-5,2-5,2-5,2-5,6-9hcp

2= free raise --- 4+,6-9TPs
2= biddable
2M= preempt--7-hcp,twice rebiddable M
2N= Truscott(Jordan) --- 5+,3-,3-,11+TPs

3= 5+,9-hcp,8+TPs
3= biddable
3M= preempt - 4+,7-hcp,/Q
3N= 5-,5-,14-21hcp,likely stop in ,likely stop in ,likely stop in .


Now we are easy to find some issues about the explanation on basic Gib CC.
1- After double,what's the complete definition of 2/3?
Obviously,only "biddable " is not complete logic definition,what else?

2- The explanation on 2N is "Truscott(Jordan) --- 5+,3-,3-,11+TPs"
A- Does it deny any stop in ? Or Does it not promise stop in ?
B- "11+TPs",is there not upper limit? Who knows it is forcing or not?

3- 3 says " 5+,9-hcp,8+TPs"
Does Gib give up limited raise ? only showing preempt raise after double over opening 1?
Where is limited raise ? I have to say this is a shortcoming of basic Gib CC. What else?
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#3 User is offline   helene_t 

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Posted 2015-November-04, 05:39

Thanks, Lycier.

Since 2M is defined as a preempt, probably 2 should be so as well. Is it possible that opener actually acts on it this way?

I don't think so since opener's subsequent 3 bid was explained as 15-22 total points. Now if 2 was 0-2 points it is clear that that is to play, while if 2 was 10+ then 3 would clearly be forcing. But opposite a 0-7 preempt (as the 2M bids are defined), 15-22 is useless as it is not clear whether responder is invited to the party or not.
The world would be such a happy place, if only everyone played Acol :) --- TramTicket
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