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GIB logic failure?


shyams

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https://www.bridgebase.com/tools/handviewer.html?lin=st||pn|shyams,~~M10220,~~M10218,~~M10219|md|2SAQHAKJ9852DA3CJ3,SJ9H6DKQ876CAK962,SK852HQ43DJ92CQ87,ST7643HT7DT54CT54|sv|o|rh||ah|Board%208|mb|1D|an|Minor%20suit%20opening%20--%203+%20!D;%2011-21%20HCP;%2012-22%20total%20points%20|mb|P|mb|P|mb|4H|an|Balancing%20jump%20overcall%20--%207+%20!H;%20strong%20rebiddable%20!H;%2015-18%20total%20p|mb|P|mb|P|mb|P|pc|CK|pc|C7|pc|C4|pc|C3|pc|DK|pc|D2|pc|D4|pc|DA|pc|HA|pc|H6|pc|H3|pc|H7|pc|HK|pc|C6|pc|H4|pc|HT|pc|SA|pc|S9|pc|S2|pc|S3|pc|SQ|pc|SJ|pc|S5|pc|ST|pc|H2|pc|D8|pc|HQ|pc|S6|pc|SK|pc|S7|pc|CJ|pc|C2|pc|S8|pc|S4|pc|D3|pc|D7|mc|12|

 

I have pasted the webviewer link of the hand.

 

At trick 6, the East bot gifted me a trick in ways that appear insane. That 10 discard by East is simply illogical.

 

Let us look at the "facts":

1. As per GIB notes, my 4 bid showed 15-18 total points and 7+ hearts.

2. Based on my cards played to the first 6 tricks, East can count (a) my 7 heart card, and (b) my 17 total points so far.

 

That's why I was baffled by the spade 10 discard.

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Looks like another case of this double dummy bug.

 

When I got the old version of GIB to simulate 100 hands, the results were:

 

49 times: ST: -480 S7: -450

12 times: ST: -480? S7: -450

39 times: ST: -420? S7: -450

 

So in that case it still came out with a low spade on top, but given how many times it calculates double dummy wrongly for the spade ten, not surprised at all that other runs could lead to the wrong result.

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