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Strange 2NT invite

#1 User is offline   Stefan_O 

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Posted 2016-June-11, 18:29

Diagram

Haven't seen this kind of goof-up before from Gib.

Seems normal to bid 4 over 1NT.
Looks like responder can see 6-2 -fit and has 14TP vs an opener...

At other tables, they responded 2NT instead of 2, and Gib then jumped to 4.
The only difference I could see in descriptions was
2=12-13HCP, while
2NT=12-14HCP
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#2 User is offline   johnu 

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Posted 2016-June-11, 18:47

An excellent description of GIB's hand.

1) 4+ spades - Check
2) 11-12 HCP - Check
3) 12+ total points - Check

Unfortunate that the patient died :P
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#3 User is offline   iandayre 

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Posted 2016-June-12, 10:24

It's true, in my experience I'd expect GIB to find the way to 4S on a hand like this. As you said the normal bid is a jump to 4S over 1NT, but GIB rarely if ever chooses this call.

A similar auction GIB handles poorly is 1m-1H-1S when responder has 4 spades and 13-14 or so. Once again the normal action is a jump to game, but GIB will typically bid 4SF before raising Spades. Apparently the original programmer wasn't aware that this auction shows extra values, and BBO has never changed it.
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