[Stephen Tu]

GIB bids w/
♠3♥K983♦Kx♣AKQ943
1♣-1♥;
2♥? - 4♥;
5♥

2♥ defined as "12-17 total points", this should be reduced so it doesn't have to catch up later?

[TylerE]

Sounds about right to me. Basically the only hands GIB can have are 12-14 balanced, or 12-16 unbalanced or so. (E.g. a balanced hand too weak to open 1N and, or an unbalanced hand too weak to make a GF splinter.

[barmar]

Shouldn't that hand reevaluate to at least 18 points once the fit is discovered? I'll bet some players would splinter with that hand.

[arigreen]

Gib evaluates this hand as 17 total points (15 HCP + 2 for singleton + 1 for doubleton -1 for "wasted" honor in the doubleton suit). I know this is far from an optimal way to evaluate a bridge hand, but this is what Gib does.

It would probably be a good idea to change the range of 2H to 12-17 total points, and have Gib bid 3H with 17-19.

[junyi_zhu]

arigreen, on Dec 20 2009, 04:40 AM, said:

Gib evaluates this hand as 17 total points (15 HCP + 2 for singleton + 1 for doubleton -1 for "wasted" honor in the doubleton suit). I know this is far from an optimal way to evaluate a bridge hand, but this is what Gib does.

It would probably be a good idea to change the range of 2H to 12-17 total points, and have Gib bid 3H with 17-19.

why does gib devaluate Kx?
Also, it seems normal to play a simple raise to show 12-15, a double raise to show 16-18 total points IMO, which is also a normal practice in expert's standard. This 12-17 thing is actually not quite playable.

[arigreen]

junyi_zhu, on Dec 21 2009, 11:58 AM, said:

why does gib devaluate Kx?

This is hardcoded into gib's algorithm for computing total points. I'm planning to experiment with better algorithms for evaluation.

I agree that 16-18 look right for a double raise. Single raises can be 12-15, and 19+ can bid 4M or splinter.