[lycier]

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I found GIB have a good understanding even without explanation.

good job - GIB!

[Bbradley62]

I'm puzzled as to how a hand that passes 1NT (and is therefore not even strong enough to invite game) can force to game in the next round of bidding. (Edit: I think North is strong enough to bid Stayman in the first place.) (Second edit: North's choosing to force to game is even more strange given that GIB's system notes indicate that South cannot have both 17HCP and 5 spades; "1NT: balanced 15-17 HCP, may have a 5-card major (GIB treats 17 with 5-card major as 18)."

And, since the explanation is "forcing to 3N", would North really pass a 3N bid by South?

This post has been edited by Bbradley62: 2014-April-02, 11:50

[Antrax]

That's not so illogical. For GIB the 2♠ shows a max 1NT opener with five spades, and the fit improves North's hand. I don't blame GIB for not inviting with this 8 HCP quackery.

[barmar]

Bbradley62, on 2014-April-02, 11:19, said:

And, since the explanation is "forcing to 3N", would North really pass a 3N bid by South?

The "forcing to" stuff is currently just descriptive, it's not used by the bidding engine. The robot might even pass a "forcing" bid if there's no rule that tells it what to bid.