[helene_t]

https://tinyurl.com/y9geex6t
So GIB (partner) open 1♦ and RHO bids 2♣. I had a balanced 8-count with five spades.
With a human partner I would have doubled, intended to correct 2red to 2♠, but I think GIB expects a stronger hand for that, so I did what GIB would have done: raising diamonds on a 3-card suit and then hoping to show spades later.

So partner invites with 3♦, I bid 3♠ (apparently showing 4+ spades), and partner raises with its 3-card support, despite having double stoppers in the enemy suit. Maybe it reasons that I won't have four hearts since I didn't double, so with the singleton hearts it avoids 3nt?

I think (but maybe you disagree?) that this is a reasonable way to bid with GIB. Would you consider the same with a human partner? Would partner understand that you are showing spade length, not some notrump probe?

[pilowsky]

Always hard to know what the robots are going to do.
I gave it to the ones on the Prime teaching table and after doubling got this auction. After causing the damage I left it to the robots to fight out - South did very nicely.
Unsurprisingly, passing - which South did when left to its own devices - was a really bad idea.
Strangely, the teaching table robot (East anyway) seems to be a little more excitable than your robots (unless you have changed the names to protect the innocent ). After reproducing your auction, East still doubled. Not a very good teacher!
I suspect the lesson is that - like oils - not all GIB's are the same.

[nige1]

helene_t 'So GIB (partner) open 1♦ and RHO bids 2♣. I had a balanced 8-count with five spades. With a human partner I would have doubled, intended to correct 2red to 2♠, but I think GIB expects a stronger hand for that, so I did what GIB would have done: raising diamonds on a 3-card suit and then hoping to show spades later.So partner invites with 3♦, I bid 3♠ (apparently showing 4+ spades), and partner raises with its 3-card support, despite having double stoppers in the enemy suit. Maybe it reasons that I won't have four hearts since I didn't double, so with the singleton hearts it avoids 3nt? I think (but maybe you disagree?) that this is a reasonable way to bid with GIB. Would you consider the same with a human partner? Would partner understand that you are showing spade length, not some notrump probe?'
++++++++++++++++++++++++
I rank:
1. Doube = NEG then 2♠ but
2. Helene_t's actions seems aggressive but reasonable with a human partner and illustrate her good rapport with GIB.

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[pilowsky]

addendum: of course the East robot on the teaching table may be in need of a tranquillizer:
https://tinyurl.com/y8tgb2vn