steve2005, on 2024-December-10, 22:44, said:
Gib abuses the 3♥ bid.
First of all it doesn't need to be nearly that good a suit and it's a 7 card suit
Secondly it shouldn't have such good support of spades especially with a side singleton
Third the A♠ is a huge card along with the semi-solid hearts this is a game force hand a great 6 loser hand with a partial fit
As for south bidding.
to bid 3NT is bizarre, you can't count on much outside for north so that you are wide open in clubs does not come as a complete shock
bidding 3♠ is also bizarre as you know south has at most 2 spades so a singleton A♥ will make hearts a better trump suit
"Secondly it shouldn't have such good support of spades especially with a side singleton"
Agree. This is frequent abuse of Gib's jump invite.
All that said, I believe that 4 heart response is clear cut considering the ace and extra values.