type gating moves in search. Seirawan Chess is added as new variant,
pluss several new combinations of Chess with different armies
+7/10/2011 Version 4.8R, keeping better track of which pieces are virgin in a
+ setup position, and have a better distinction between use of the '4'
+ move-rights code between an initial double-step jump without e.p.
+ rights (as could so far only be used for Pawns, as the Spartan
+ Hoplite), and castlings. As a result even royal pieces can now get
+ an initial double-step other than castling, which has been used to
+ implement Cambodian Chess as a sub-variant of Makruk (selected
+ through a new option). Falcon Chess was added as a new variant.
+