Does GIB ever raise NT to 7NT?

[AyunuS]

I've been having a little fun playing some bidding tables where I set E/W to have 40 HCP every time, and I notice that they often still do not bid a grand slam. They like to stop at 6 even when they obviously have more points than the requirement for 6. See:

http://tinyurl.com/jk2kort

http://tinyurl.com/zwugfjb

http://tinyurl.com/gt46avd

http://tinyurl.com/zua9jqt

 

And many other times it'll just stop at 6 in a suit as well, but at least in those it feels more like it usually did a reasonably job of trying to get 7 if there was hope. On NT it seems to just go to 6NT even when it has 17 HCP opposite a 23-24 HCP and it should have been obvious from that that they had 40 HCP.

[manudude03]

The third one in particular is quite funny, East bids gerber when holding all 4 aces, sees partner show none and then doesn't bother asking for kings.

[lycier]

Interesting problem.

For example :

Your hand :

 

[hv=http://www.bridgebase.com/tools/handviewer.html?sn=AyunuS&s=S952H754D7654C865&wn=Robot&w=SKQHAJT6D832CAQJ4&nn=Robot&n=ST8643H9832DTCT92&en=Robot&e=SAJ7HKQDAKQJ9CK73&d=n&v=n&b=5&a=P2C(Strong%20two%20club%20--%2019+%20HCP%3B%2023+%20total%20points%3B%20forcing%20to%202N)P2N(Positive%20notrump%20--%202-5%20%21C%3B%202-5%20%21D%3B%202-4%20%21H%3B%202-4%20%21S%3B%208+%20HCP)P4N(Quantitative%20invite%20to%206NT%20--%2023-24%20HCP)P6N(2-5%20%21C%3B%202-5%20%21D%3B%202-4%20%21H%3B%202-4%20%21S%3B%2010-12%20HCP)PPP]400|300[/hv]

 

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Now let me replay it :

[hv=http://www.bridgebase.com/tools/handviewer.html?sn=机器人&s=S952H754D7654C865&wn=机器人&w=SKQHAJT6D832CAQJ4&nn=机器人&n=ST8643H9832DTCT92&en=lycier&e=SAJ7HKQDAKQJ9CK73&d=n&v=o&b=1&a=P2C(Strong%20two%20club%20--%2019+%20HCP%3B%2023+%20total%20points%3B%20forcing%20to%202N)P2N(Positive%20notrump%20--%202-5%20%21C%3B%202-5%20%21D%3B%202-4%20%21H%3B%202-4%20%21S%3B%208+%20HCP)P3N(2-5%20%21C%3B%202-5%20%21D%3B%202-4%20%21H%3B%202-4%20%21S%3B%2022%20HCP%3B%2023+%20total%20points)P6N(2-5%20%21C%3B%202-5%20%21D%3B%202-4%20%21H%3B%202-4%20%21S%3B%2011-13%20HCP)PPP&p=H2HKH4HTS7S2SKS3C4CTCKC5C7C8CAC2D3DTDAD7C3C6CQC9H6H3HQH7SJS9SQSTD8S4DKD5DQD6D2H8DJD4CJS8D9H5HAH9SAS5HJS6]400|300[/hv]

 

[hv=http://www.bridgebase.com/tools/handviewer.html?sn=机器人&s=S952H754D7654C865&wn=机器人&w=SKQHAJT6D832CAQJ4&nn=机器人&n=ST8643H9832DTCT92&en=机器人&e=SAJ7HKQDAKQJ9CK73&d=n&v=o&b=1&a=P2C(Strong%20two%20club%20--%2019+%20HCP%3B%2023+%20total%20points%3B%20forcing%20to%202N)P2N(Positive%20notrump%20--%202-5%20%21C%3B%202-5%20%21D%3B%202-4%20%21H%3B%202-4%20%21S%3B%208+%20HCP)P4N(Quantitative%20invite%20to%206NT%20--%2023-24%20HCP)P6N(2-5%20%21C%3B%202-5%20%21D%3B%202-4%20%21H%3B%202-4%20%21S%3B%2010-12%20HCP)PPP&p=S4S7S9SKH6H3HKH7C7C5CQC2D2DTDAD7C3C8CJC9D3STDKD4SJS5SQS8C4CTCKC6DQD5D8H9DJD6HTH2D9H4HJS6HQH5HAH8CAS3SAS2]400|300[/hv]

 

[hv=http://www.bridgebase.com/tools/handviewer.html?sn=机器人&s=S952H754D7654C865&wn=lycier&w=SKQHAJT6D832CAQJ4&nn=机器人&n=ST8643H9832DTCT92&en=机器人&e=SAJ7HKQDAKQJ9CK73&d=n&v=o&b=1&a=P2C(Strong%20two%20club%20--%2019+%20HCP%3B%2023+%20total%20points%3B%20forcing%20to%202N)P2N(Positive%20notrump%20--%202-5%20%21C%3B%202-5%20%21D%3B%202-4%20%21H%3B%202-4%20%21S%3B%208+%20HCP)P4N(Quantitative%20invite%20to%206NT%20--%2023-24%20HCP)P7N(2-5%20%21C%3B%202-5%20%21D%3B%202-4%20%21H%3B%202-4%20%21S%3B%208+%20HCP)PPP&p=C2C3C6CJD2DTDAD7DKD5D3S3DQD6D8C9DJD4H6H3D9H4SQS4CKC8C4CTC7C5CQS8CASTS7S2SKS6SAS9HKH7HTH8HQH5HAH9HJH2SJS5]400|300[/hv]

 

Now we can be easy to find the explanations on 6nt and 7nt are wrong.

[lycier]

The third one in particular is quite funny, East bids gerber when holding all 4 aces, sees partner show none and then doesn't bother asking for kings.

 

Yes.

 

His third hand :

[hv=http://www.bridgebase.com/tools/handviewer.html?sn=AyunuS&s=ST9643H875D65CT92&wn=Robot&w=SQJ8HKJ4DKJ82CKQ5&nn=Robot&n=S52HT93DT743C8764&en=Robot&e=SAK7HAQ62DAQ9CAJ3&d=e&v=e&b=6&a=2C(Strong%20two%20club%20--%2019+%20HCP%3B%2023+%20total%20points%3B%20forcing%20to%202N)P2N(Positive%20notrump%20--%202-5%20%21C%3B%202-5%20%21D%3B%202-4%20%21H%3B%202-4%20%21S%3B%208+%20HCP)P4C!(Gerber%20--%2024+%20total%20points)P4D(Gerber%200%20or%204%20--%202-5%20%21C%3B%202-5%20%21D%3B%202-4%20%21H%3B%202-4%20%21S%3B%208+%20HCP)P6N(25-27%20HCP)PPP]400|300[/hv]

 

Here I replay it :

[hv=http://www.bridgebase.com/tools/handviewer.html?sn=机器人&s=ST9643H875D65CT92&wn=机器人&w=SQJ8HKJ4DKJ82CKQ5&nn=机器人&n=S52HT93DT743C8764&en=机器人&e=SAK7HAQ62DAQ9CAJ3&d=n&v=o&b=1&a=P2C(Strong%20two%20club%20--%2019+%20HCP%3B%2023+%20total%20points%3B%20forcing%20to%202N)P2N(Positive%20notrump%20--%202-5%20%21C%3B%202-5%20%21D%3B%202-4%20%21H%3B%202-4%20%21S%3B%208+%20HCP)P4C!(Gerber%20--%2024+%20total%20points)P4D(Gerber%200%20or%204%20--%202-5%20%21C%3B%202-5%20%21D%3B%202-4%20%21H%3B%202-4%20%21S%3B%208+%20HCP)P6N(25-27%20HCP)PPP&p=HTH2H5HJD8D4DQD5C3C2CQC8D2D3DAD6S7S3SQS5S8S2SAS9H6H7HKH9C5C4CJC9D9STDKDTH4H3HAH8HQS6DJC7SKS4SJC6CACTCKD7]400|300[/hv]

 

Now you see same sequences,but surprisedly we can find 6nt says " 25-27hcp". If E Gib holds 25-27hcp, it should open 3nt instead of 2♣ on Gib CC.

Just saying.

[lycier]

[hv=http://www.bridgebase.com/tools/handviewer.html?sn=机器人&s=ST9643H875D65CT92&wn=机器人&w=SQJ8HKJ4DKJ82CKQ5&nn=机器人&n=S52HT93DT743C8764&en=lycier&e=SAK7HAQ62DAQ9CAJ3&d=n&v=o&b=1&a=P3N(Strong%20hand%20--%202-5%20%21C%3B%202-5%20%21D%3B%202-4%20%21H%3B%202-4%20%21S%3B%2025-27%20HCP)P7N(11+%20HCP)PPP&p=STSJS5S7HKH3H2H5HJH9H6H7H4HTHAH8HQS9S8C8SAS6SQS2SKS3D2D7DAD5D8D4CAC2C5C6DQD6DJDTD9C9DKD3CQC7C3CTCKC4CJS4]400|300[/hv]

[1eyedjack]

The third one in particular is quite funny, East bids gerber when holding all 4 aces, sees partner show none and then doesn't bother asking for kings.

Maybe going via gerber shows a different range than the 6N direct. But I doubt it

[manudude03]

Maybe going via gerber shows a different range than the 6N direct. But I doubt it

 

So partner is supposed to guess whether or not there is an ace missing? (give West a weaker hand for it to make sense).

[iandayre]

As far as I've ever been able to tell, GIB makes no distinction between opening 3NT and opening 2C and jumping to 3NT over 2D. If the response to 2C is 2NT, 3NT shows a minimum balanced 22 HCP.