[thorvald]

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Partner stole the new minor forcing, so what to bid?

Spoiler

GIB Passed

[zhasbeen]

thorvald, on 2022-October-22, 08:11, said:

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Partner stole the new minor forcing, so what to bid?

Spoiler

GIB Passed

My bid would be 4 spades on strength of 5th spade and ace in suit partner opened

[smerriman]

I know I wrote this after you posted this thread, but I'm quoting it just because this is a really good example:

smerriman, on 2022-October-22, 13:09, said:

Database issues like this only need fixing if there is an *earlier* bid in the sequence where simulations have been turned on - because it uses the database for the followup.

GIB has been programmed that fourth suit forcing shows 13+ total points, and it only has 12. It also has a well known poor priority of rules for giving preference to diamonds over clubs, and of course doesn't match rules for other bids like bidding no trump. This hand happens to be one that falls through the cracks where nothing matches.

But that's not really a big deal at all, since after the database tells it to pass, the paid robot runs various hands for South and gets to pick from all of the above options anyway and see what works best. Running this through the older version of GIB 40 times, it chooses 3♥ 35 times, an invitational 3♦ 4 times, and pass once. Harder to test the frequencies with the up-to-date robot because teaching tables lock in a fixed seed - there I actually do get a pass both vulnerable, but 2♥ at others - it may be that the seed hit the 1 in 40 shot, or something else is going on.

You could reduce the lower limit on 4SF but 1 point and this hand would no longer be a problem, but then you'd easily find a slightly weaker hand (with poorer placed honors) and could post that as a bug that it was too weak to bid 4SF. And then you could reshuffle the priority for preferences, which should probably be done anyway, but all in all the robot should virtually always get this one right, so all those changes aren't likely to achieve much.

[thorvald]

Just found a new version of this problem

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The bot found no bid so it passed

Strange when partners 2♣ is 11-16 HCP

[smerriman]

Not strange at all; exactly as described above. Not something that needs fixing; just stop playing with the free bot

[thorvald]

smerriman, on 2022-November-04, 14:42, said:

Not strange at all; exactly as described above. Not something that needs fixing; just stop playing with the free bot

I would have lost the board anyway :-)

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World Bridge Challenge is using the free bots. Interesting if BBO will offer Argine in the challenge section

[pescetom]

smerriman, on 2022-October-22, 13:42, said:

GIB has been programmed that fourth suit forcing shows 13+ total points, and it only has 12.

I got the idea that Gib adds a total point for the diamonds doubleton, is this wrong?

[smerriman]

No, but it subtracts a point if there's an honor in a short suit.