[thorvald]

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From a match between 4 GIBs

11 easy tricks, where did GIB go wrong?

[pescetom]

thorvald, on 2023-June-19, 11:57, said:

11 easy tricks, where did GIB go wrong?

No idea, but South GIB already went wrong with Double.

[smerriman]

GIB's forcing pass rules / when to double, pass or bid 5 are 100% broken, and basically force South to double here (and North to pass). The other options that North considers at its first bid also break in similar ways when following the book to the end of the auction, leading to its wacky limit raise.

That latter part may also be caused by the fact the old version of GIB only considers 2♠ and 3♥, never a 4♥ preempt for who knows why.. so it might just pick 2♠ as the only route to game, even if it results in defending doubled once in a while..

[thorvald]

smerriman, on 2023-June-19, 19:46, said:

GIB's forcing pass rules / when to double, pass or bid 5 are 100% broken, and basically force South to double here (and North to pass). The other options that North considers at its first bid also break in similar ways when following the book to the end of the auction, leading to its wacky limit raise.

That latter part may also be caused by the fact the old version of GIB only considers 2♠ and 3♥, never a 4♥ preempt for who knows why.. so it might just pick 2♠ as the only route to game, even if it results in defending doubled once in a while..

Yes, I think you are right, that the wrong bid in this sequence is 2♠