[lycier]

This hand is very interesting,same hand with different results.And these hands also show some problems of Gib bidding.

Hand-1

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How many differences are there between human and robots?
Human can make reasonable judgement by thinking,robots can't do it.
After redouble,almost of human must respond 1♠ even with 4-card support,robots never do same,it seems robots only respond longest suit - 2♦.

Hand-2

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Now look,this hand is just a evidence.
However,it is a great pity that both of Gib N and Gib W don't live up to its promise - Redouble promises " opponents can't play undoubled below 2N ".
I guess that the reasons may be only 3-card,not 4-card ♠ in Gib E hand since maybe its bidding rule is it is only 4-card♠ for doubler to make penalty.

Hand-3

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Rebidding 2♦ after redouble? Doesn't Gib follow its promise?
This hand shows Gib bidding with lack of necessary rule after redouble.

Hand-4

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Gib E's second double says " 2-♥,2+♠,12+HCP,13+TPs,forcing to 3N,opponents can't play undoubled below 2N ".
I think this is a cooperative double,Gib W should pass.
So Gib W bidding 3♥ is very contradictory.