[fuburules3]

http://tinyurl.com/7y29hco

[barmar]

The book bid is Pass. For some reason, all the simulated hands it dealt give you 6322 shape, and it thinks it will do better on average in the 5-2 fit than in NT. Some of them even have 3 spades, even though you've denied that. All the hands are marked "mismatch 1", so apparently it couldn't find any hands that it felt actually matched your bidding, and these are the closest it could find.

Maybe you should reverse into 2♦ on your second bid. The auction would then go 1♣ 1♠ 2♦ 2♠ 3♣ 3NT.

[fuburules3]

barmar, on 2011-December-22, 17:15, said:

The book bid is Pass. For some reason, all the simulated hands it dealt give you 6322 shape, and it thinks it will do better on average in the 5-2 fit than in NT. Some of them even have 3 spades, even though you've denied that. All the hands are marked "mismatch 1", so apparently it couldn't find any hands that it felt actually matched your bidding, and these are the closest it could find.

Maybe you should reverse into 2♦ on your second bid. The auction would then go 1♣ 1♠ 2♦ 2♠ 3♣ 3NT.

I took the low road opposite a potential misfit, but it seems that reverse would have worked better with GIB.

I view it as a situation where I know a lot about GIB's hand and he knows relatively little about mine (outside the 6Cs) so he should respect my sign off (not sure if it is easy to program this).

[Bbradley62]

barmar, on 2011-December-22, 17:15, said:

Some of them even have 3 spades, even though you've denied that.

Note that the explanation of 2♣ includes "3- S", which is reasonable, but the description of 3N also includes "3- S".

[barmar]

Bbradley62, on 2011-December-23, 08:35, said:

Note that the explanation of 2♣ includes "3- S", which is reasonable, but the description of 3N also includes "3- S".

Which explains the "mismatch 1" designation I mentioned.

When GIB is simulating, it deals out a bunch of hands, and then sorts them by how few mismatches they have from the possible hands shown in the auction, and selects the top N. In this case, it never got below 1. Every hand it dealt had some disagreement with the auction, and in some cases it was the third spade.

I think the basic problem is that your jump to 3NT showed a hand that should have been strong enough to jump to 3♣ or reverse on the previous round. Once you took the low road, you confused the robot. It had to guess what kind of lie you told, and it has no basis for assuming that you lied about strength rather than about shape.