lamford, on 2010-December-30, 19:00, said:
I was asked my opinion on the above by a TD. He ruled and his ruling was not appealed. There was a BIT before South's penultimate pass.
a ) Would you allow the 5♠ bid? North was a top player.
b ) What bid do you think is demonstrably suggested?
It is matchpoints, and the table result was 5SX-1.
Your questions need to be considered in reverse order, so I'll answer b ) first.
It is right for North to bid 5
♠ if either N/S can make 11(+) tricks in spades or N/S can make 10 tricks in spades with 5
♥ making. North has no defence at all, and combining this information with the fact that South didn't double suggests that it will be right to bid whenever spades makes at least 10 tricks.
If South was considering bidding 5
♠, that obviously makes it more attractive for North to compete with 5
♠. What if South was considering doubling? In that case, the slowness of the Pass implies extra values without 3 certain defensive tricks. But the more values South has, the higher the expected number of tricks available in spades becomes. Even if South has the apparently wasted
♥A, an opening heart lead allowing a fruitful club discard is a possibility.
So 5
♠ is demonstrably suggested over Pass.
To answer (a),it is necessary to determine whether Pass is a logical alternative. I would ask the North player to explain the reasoning for his bid. I would also perform a poll of other "top" players at the event, if possible.
a ) Would you allow the 5♠ bid? North was a top player.
b ) What bid do you think is demonstrably suggested?