This is just the latest version of the binaries.
Note that there are two excecutables:
FSharpChess includes a UI partially written in C#
FSharpChessWB is for use with WinBoard and is all F#
Note that this version includes the two main F# support DLLs so that it will run on machines that do not have the latest F# April CTP.
If you have any issues with this release, please let me know using the discussions section.