[dcohio]

Can anyone explain GIBs 5♥ bid in this auction?

http://tinyurl.com/yc9z8tl

[uday]

Short version:

GIB is supposed to bid 5H. It sometimes considers alternatives.

It considered 5D and 5H. It realized that there was no hand with which opener would have enough power to bid 6H over either 5D or 5H. That is, no matter what it did the auction would end in 5H ( by this I mean that in all the hands it considered, there was no hand with which the rules allowed partner to move past 5H)

So it resolved the tie in favour of the bid it knew it was supposed to make ( 5H )

There might be a weakness in the rules here, will add to our GIB issue list.

U

[TimG]

uday, on Dec 5 2009, 10:01 PM, said:

There might be a weakness in the rules here, will add to our GIB issue list.

Is there a special place to post GIB "oddities"?

Earlier today I experienced this auction:

1♥-DBL-P-2♦
P-?

and when I looked at my options found that 2♥ showed 25+, forcing to 3N; and 3D showed 12-14 with 4 diamonds. I had no heart stopper, so 2N or 3N seemed out of line, but there was no option appropriate to show extras without also bypassing 3N.

[uday]

Maybe we can set one up when ari returns from San Diego

[cherdanno]

Uhm, I would also have bid 5H there. GIBs reasoning seems sound to me...

[barmar]

Why didn't you cue-bid your ♠ Ace? Maybe it would have cue bid if it knew there were no ♠ losers.

[cherdanno]

barmar, on Dec 6 2009, 04:39 AM, said:

Why didn't you cue-bid your ♠ Ace? Maybe it would have cue bid if it knew there were no ♠ losers.

Are we really discussing which cuebid to make after 1H 1S 3H 4H? The given hand was too strong for a 3H rebid, and this is what caused all the problems in the first place; bidding on over 4H is of course inconsistent. GIB doesn't mechanically cuebid ever as far as I know, it always considers quantitative evaluations when cooperating with slam tries. And it won't forget you bid 3H before.