Strange double, strange upgrading.

[lycier]

This hand is from " Start a video bridge game (free)" in Solitaire.

[hv=http://www.bridgebase.com/tools/handviewer.html?sn=lycier&s=SAQ5HT87DAKQ764CT&wn=Robot&w=S6HAQ92DT95CAQ854&nn=Robot&n=SKT9742H6DJCJ9763&en=Robot&e=SJ83HKJ543D832CK2&d=n&v=o&b=1&a=PP1D(Minor%20suit%20opening%20--%203+%20%21D%3B%2011-21%20HCP%3B%2012-22%20total%20points)2C(Two-level%20overcall%20--%205+%20%21C%3B%2010+%20HCP%3B%2011-18%20total%20points)PPD(2-%20%21C%3B%203-7%20%21D%3B%203+%20%21H%3B%203+%20%21S%3B%2011-21%20HCP%3B%2012-22%20total%20points)2H(5+%20%21C%3B%20biddable%20%21H%3B%2014-18%20total%20points)2S(11-%20HCP%3B%20biddable%20%21S%3B%206-12%20total%20points)PPD(5+%20%21C%3B%205-%20%21D%3B%205-%20%21S%3B%20biddable%20%21H%3B%2018%20total%20points)P4H(4+%20%21H%3B%208-%20total%20points)D(2-%20%21C%3B%203-7%20%21D%3B%203+%20%21H%3B%203+%20%21S%3B%2015-%20total%20points)P4S(5+%20%21S%3B%209-11%20HCP%3B%2010-12%20total%20points)D(4+%20%21H%3B%206+%20HCP%3B%207-8%20total%20points)PPP&p=H4H8HAH6H9S2H5HTDJD8D6D5STS3SQS6S5C4SKS8S9SJSAC8DAD9C3D2DKDTC9D3DQC5C6H3D7H2C7C2D4CQCJHJ]400|300[/hv]

 

After 2♠, Gib W suddently makes a strange double only with 14 TPs in the minimum 5431 hand, I think Gib W really has no ability to do any thing except passing. I believe all human players would pass in this situation.

And what's more, claiming it has exact 18TPs ! I am wondering how to upgrade to 18TPs. So it should mislead Gib E's double.

[The_Badger]

Yes lycier, I, too, find it totally bizarre. I surmise, maybe GIB has a mechanism for not allowing a contract to rest in 2♠ in a competitive auction at equal vulnerability if it has a certain shape. (What else can it be?)

 

End result: opponents end up in a doubled unbeatable game with two overtricks (as played). Yes, totally bizarre :(

[iandayre]

At least we have to give GIB N credit for pulling the double to 4S.