Brian Haskin (username Janzert) did a study to see what the Arimaa branching factor is like. You can find his article at:
Also be sure to read the discussion of this study in the forum for more useful information.
A look at Arimaa branching factor
The database used in this study is about 18 MB and is available for download.
Branching factor data.
Besure to check the forum for information on how to use this data.
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