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Chu Shogi. (Updated!) Historic Japanese favorite, featuring a multi-capturing Lion. (12x12, Cells: 144) (Recognized!)[All Comments] [Add Comment or Rating]
A. M. DeWitt wrote on Wed, Jul 17 02:20 PM UTC in reply to H. G. Muller from 07:51 AM:

Actually every move should be marked as illegal for a player that has no royal in a game where royals are defined. It is just that the absence of royalty is only tested when a piece with special (royalty, baring, anti-trading) properties is captured, as the AI assumes royalty still exists before the move, or the search branch would already have been terminated earlier. So it only tests it when it could have changed.

[Edit] For the purpose of highlighting the legality test now assumes a royaltyCount of 1 in the current position when in reality royaltyCount <= 0. In terms of scoring this fakes a single royal for the side that has none.

Technically you are right about that first point. I guess it was less of a visual bug and more of an inconvenience for tsume diagrams that would cause confusion for the solver, especially for large libraries of tsume problems like what I have in my Applet. Thanks for fixing it anyway, though.