[pescetom]

It's known that GiB explanations are often misleading due to bovine merging of texts and counts, but this seems odd to me by any standards.

The off-shape takeout double showing 2-♦ 3+♥ would already have Blue Team critics in incandescence
Then after partner's honest 1♥ minimum (GiB is above passing), 2♦ now opens up a new world that may have diamonds after all and forces to 3♥.
Given the force, Partner shows his spades (GiB is above passing) and now 2NT promises 22-24 HCP and likely minor stops.
What should a country boy do?
3NTX-1 (could have been -2) for 16% by paying customer.

[smerriman]

Off-shape doubles are GIB's most well-known issue. Almost sequence starting with such a double is messed up.

The description of double is what I was referring to last thread; it's not what it holds / disclosure to the opponents, but the information that partner should assume when making its response.

It has a "wipe all information you know so far" flag for rules for some later bids that show a strong hand instead. But these rules are so specific that it often bypasses them, which is why you never double with a one-suited hand playing with GIB (opponents / partner bid in such a way that we're outside the simple followups, and now you're stuck with having showed length in three suits indefinitely).

Seems it's not allowed to pass or bid 1NT with this hand, but x followed by 1NT (if the 2♣ bid wasn't made) is 19+ HCP, so that's out too. It's only remaining option is double then immediately cue to wipe-the-info.

It was able to do that, but by its next bid we're way past any well defined sequences. 2NT is always accept-if-you-have-slightly-more-than-minimum, and partner has shown 0 points to date, which is where the HCP range comes from. But anything other than 2NT shows an even stronger hand, so it had nothing better..

Playing best-hand tournaments, you get to avoid this more often. Playing with GIB anywhere else, just have to 'wipe-the-info' about the entire hand from your brain and move on