[barmar]

I had two auctions today where I opened with a minimum, GIB made two forcing responses, and the explanations of all possible third-round bids said they showed extra values.

One was 1♥-1NT(forcing)-2♣-2♠. The "impossible 2♠" shows an invitational hand with 5+ ♣. I had a minium 4=5=1=3 hand, but apparently there was no way to stop in 3♣. When I tried bidding 3♣, GIB showed its ♠ fragment. At least it let me stop in 4♣, so I only went down 1.

I don' remember the details of the other hand, but I think it was me opening a minor, a WJO by West, and North making a negative double. I had stoppers in LHO's suit, so I wanted to bid 2NT, but hovering over the bid said it showed 18-19 HCP. And all the 3-level bids showed at least 14 HCP.