According to wikipedia's article FreeCell (Windows) there are 8 unsolvable
games.
"Unsolvable combinations
Out of the Microsoft Windows games, there are believed to be 8 which are
unsolvable. They are games No. 11,982, No. 146,692, No. 186,216, No.
455,889, No. 495,505, No. 512,118, No. 517,776, and No. 781,948. This
conclusion was arrived at by the consensus of several authors of FreeCell
solvers. The solvers of both Danny A. Jones and Gary D. Campbell have been
run through the first million FreeCell games and have found solutions to all
but these eight. Several other solvers have also failed to produce solutions
to these games."
"The Lone Unsolvable FreeCell Game (#1198" <The Lone Unsolvable FreeCell
Game (#
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