Do they work?

Here are some hands.

The link above is s complete self-installing version of BRBR which will allow you to look at these hands. You may have to do some of your own research. These were taken from 2002a, and were all the hands fitting the criteria:

a. Doubled slam contract
b. Opponents never bid anything except pass or double

within a six-month period (some 8 million play records)

Unfortunately, it isobvious that this did not adequately test for Lightner doubles. Many of the doubles in the play file are from people who simply are sure that they can defeat the contract.

Now perhaps you can figure out the correct way to search in this subset to demonstrate which hands are lightner doubles.

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