Here is another one shown at VA 2010. Again only John Webster was able to solve it, although others tried hard. Judging by the time it took John to solve it, I would rate it as slightly easier than the first one.
The theme was published in 1894 by the incomparable George H. Slocum 1855-1914. A modification of his setting was published in Ryan's American Checkerist 1944 and in Oldbury's Encyclopedia 1980. I made a further (very minor) modification with the following result:
Theme by G. H. Slocum

White to Play and Win
After you have solved it, change the Red king on 5 to a single piece and find a second way to win. The second way "reverses" the finale of the first.
After you have found the dual solutions to the second setting, change the single Red piece on 16 to a king. Then White can't win at all.
To me, that's entertainment! How about you?
Bill Salot