[bluejak]

What I need is a fairly simple example of this in action. I am trying to give an example of how the mechanics or mathematics work, so the description of the hand itself should be as simple as possible.

[FrancesHinden]

How about this:

Scoring: IMP

1♥ 3♠ 4♥ P*
P 4♠ P P dbl
all pass

---

East thinks for a long time over 4hearts and eventually passes.
The play in 4S goes: ace of hearts lead; diamond to the king; club to the ace; club ruffed (revoke); king of diamonds resulting in a two trick penalty and 4S making

The TD rules that the 4S bid from West is illegal and wants to adjust the contract to 4H making 10 tricks.

[bluejak]

Thanks. I shall look at this and one that Peter E emailed to me and come up with something.