[helene_t]

Basic robots.

1♣-(dbl)-2♦

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

[lycier]

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?

[helene_t]

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.