H. G. Muller wrote on Thu, May 8, 2014 03:31 PM UTC:
I just updated the package, as there was a bug in WinBoard considering dropping of a Pheasant illegal.
A Japanese website ( http://www10.ocn.ne.jp/~cha/kotenyugi/tori_shougi/tori_syogi.htm ) mentions a different repetition rule: there the side that first created a repeated position must alter its move to prevent it is repeated for the third time, rather than the one playing out of it. Except during a check evasion; you can always evade whichever way you like.
For Shokidoki I adopted the practically identical rule that it is forbidden to repeat, but that perpetual checking is even more forbidden.