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Inexplicable jump to grand slam

#1 User is offline   wbartley 

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Posted 2017-October-30, 17:51

Just play bridge robots

A84
T
KJ83
QT843

K982
AK2
AQ97
KJ

West deals. Nobody vul. I am South

The auction goes three passes and then 2N=3=4=4=4=7!
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#2 User is offline   smerriman 

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Posted 2017-October-30, 18:21

Your 4 bid is a cue bid in spades, promising the ace or a void (GIB requires showing first-round controls before second-round controls).

Since it has the ace, you must have a void, despite the 2NT opening bid (I'm not sure how it decides which lie to believe when you have contradicted yourself). If you have 20-21 points and a void in spades, 7 looks a good bid.
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#3 User is offline   wbartley 

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Posted 2017-October-31, 10:33

View Postsmerriman, on 2017-October-30, 18:21, said:

Your 4 bid is a cue bid in spades, promising the ace or a void (GIB requires showing first-round controls before second-round controls).

Since it has the ace, you must have a void, despite the 2NT opening bid (I'm not sure how it decides which lie to believe when you have contradicted yourself). If you have 20-21 points and a void in spades, 7 looks a good bid.


Let's assume that it gives me a void in spades, Outside of spades there are 24 missing HCP, so I could still be missing the ace of clubs and have 20 points.
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#4 User is offline   virgosrock 

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Posted 2017-October-31, 10:44

View Postwbartley, on 2017-October-31, 10:33, said:

Let's assume that it gives me a void in spades, Outside of spades there are 24 missing HCP, so I could still be missing the ace of clubs and have 20 points.


I am assuming 4H is a splinter. If so, sign off in 5D holding wasted values opposite a splinter and GIBBO's strength unknown. Methinks GIB will bid 6D.

vrock
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#5 User is offline   virgosrock 

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Posted 2017-October-31, 11:43

View Postvirgosrock, on 2017-October-31, 10:44, said:

I am assuming 4H is a splinter. If so, sign off in 5D holding wasted values opposite a splinter and GIBBO's strength unknown. Methinks GIB will bid 6D.

vrock

again, assuming 4H is a splinter more reason to bid only 5D. The 4S convince GIB there are a lot of points.

vrock
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#6 User is offline   wbartley 

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Posted 2017-November-01, 09:40

It bid a grand slam off an ace when 1) it has the means to determine that it is off an ace 2) By any interpretation of my bidding, reasonable or otherwise, being off an ace is a possibility.
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