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What is the reason behind bidding 5 Hearts

#1 User is offline   thorvald 

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Posted 2022-August-16, 16:38

In this sequence GIB bid 5♥

Poll


As you can see from my comment in the poll:


The interesting problem is that 4th suit forcing can either be
A: A hand with 5♥s - but wouldn't that hand just bid 4♥ now?
B: A doubt showing 3N, then 4♣ would problably be our bid
C: A hand to strong for 3N directly after 2♣. Then we just want to play 3N.

What are the rules GIB is following?
Thorvald Aagaard
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#2 User is offline   smerriman 

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Posted 2022-August-17, 19:30

According to the definition, 3NT shows 14-21 points. But in reality it would bid 3NT earlier with up to around 16. So I would it to have at least 17 in this auction.

Whether North knows that or not when simulating, I don't know. Why it bids 5♥ instead of 4 of a minor (which my GIB seems to prefer, and it seems to think slam is making quite a lot), I don't know.
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Reverse engineering GIB, part 1: A treatise on the insanity of bidding simulations
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