[wbartley]

Just play bridge robot. Human South.

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Now I know that the explanation of the bids in GIB is unreliable in many cases. Here the 3♥ bid is described as 4+♥; 5+♠ and 12-22 total points which suggests to me that it doesn't show extras in any sense of the word. Since a raise of hearts shows four (according to the explanation when you hover over the bid), the only bid that South can make that fits with what is expected is 3NT.

At this point, GIB goes off the rails and bids 4♠ instead of the obvious 4♥.

[steve2005]

There are a lot of situations where Gib making a bid doesn't show extras according to description .
This makes slam bidding really difficult. And same for the human. Often there is no reasonable way to show extras.

Here, NS are forced to game. North with nothing extra can pass. So bidding clearly has to show extras, either in shape or hcp. Yet there you are potentially opposite a 12-14 without much to say.

[virgosrock]

steve2005, on 2018-March-23, 15:33, said:

There are a lot of situations where Gib making a bid doesn't show extras according to description .
This makes slam bidding really difficult. And same for the human. Often there is no reasonable way to show extras.

Here, NS are forced to game. North with nothing extra can pass. So bidding clearly has to show extras, either in shape or hcp. Yet there you are potentially opposite a 12-14 without much to say.

what would a jump to 4H show? over 3C.

vrock

[PrecisionL]

5-5

[virgosrock]

PrecisionL, on 2018-March-24, 06:08, said:

5-5

and possibly 11-22? doubt if a shut-out bid

vrock