[zdedo]

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This hand from instant tourney
4 ♥ lead won by A
all declarers shift to dummy in ♦
who start ♠ with 9 ROH inject J make it -1
who start with 7 Bot smashes his p K with A making life easy for declarer ?!
any one can explain or is it just a bot issue?
Thanks

[steve2005]

FYI this should be posted in Gib discussion forum.

On bidding and lead declarer is marked with 1♥ and 6 or 7 ♠.
So partner has 0 or 1 ♠. So playing anything other than 3♠ helps declarer. East should let declarer guess. Even playing the J on 9 is wrong if East plays small and declare plays Q East gets A & J.
Gib uses a set of hands with double dummy analysis to make decisions. with the basic bot it doesn't use enough hands and often gets things wrong. Advanced bot might do better.

[WellSpyder]

steve2005, on 2015-September-03, 06:37, said:

.... East should let declarer guess. ....

...Gib uses a set of hands with double dummy analysis to make decisions....

If GIB is using double dummy analysis, it presumably doesn't understand the concept of letting declarer guess.