wbartley, on 2018-February-25, 11:57, said:
This one really surprised me. I thought NT sequences would be rock solid but GIB really blows it here.
Just play bridge robot. Human South
3N shows 25-27. GIB has a solid 6 count with a five card spade suit. There should at least be an invitation here although it could be argued that North should just bid 6.
On the GIB convention card it says “3NT 25 to 27”. The system notes don’t say what 2C-P-2D-P-3NT is.
My first experience opening 3NT left me playing it there, while those who opened 2C and rebid 2NT reached a cold slam. It doesn’t seem fair, but that’s GIB.
The only thing I see that might have worked would be raising 2D response to 3 (or possibly rebidding 2NT that shows only 22-24 HCP!)
Here’s link to system notes. There’s another link at top of page that will take you to convention card.
http://www.bridgebas...ystem_notes.php
GIB is a very difficult partner, no doubt about it.