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Detecting cheating

I've been trying to come up with a relatively straight forward way to estimate whether or not a pair is exchanging some form of illicit information and came up with what I think might be a promising approach.  I am curious what folks who play in top level events think about the following:

Let's assume that a pair is cheating by exchanging unauthorized information.  (They have a wire that they are using to convey information about hand strength or club length or heart length or whatever).

There are some types of actions at the bridge table where this information will be extremely useful.  (opening leads, partnership defense, bidding).  However, there are other types of actions where this information will be of much less utility.  For example, consider declarer play where you are in the same contract as the rest of the field.  In theory, your ability to exchange illicit information might have allowed you an unusually efficient auction that might conceal some useful information from the defense.  Even so, I would expect that a pair that was cheating would have much less of an edge in this case than during other types of actions.

If this is true, than a dramatic skew in a partnership's skill in (defense) versus (declarer play in "field" contracts) might provide a useful signal to infer that a pair is cheating.

If I had a large data set, this would probably be the first slice that I would look at.

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