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The Theory of Vacant Spaces?

I am trying to come up with a defense for "nine never" which never gets much respect. Using the figures in the Bridge Encyclopedia I calculated playing for the drop would work 52.15% of the time and the finesse 47.85% on the second round of this suit where West has followed low once and East twice:



That assumes no information about any other suits. I curious what would be the math adjustment if the bidding indicated West had 5 and East 4 of another suit? In other words West has 8 vacant spaces and East has 9?

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