H. G. Muller wrote on Fri, Jul 31, 2020 06:58 PM UTC:
Note that the castling move that is now defined for the King (isO2) describes castling with the furthest piece in that direction. Which in this case is the Judge. If you would want it to castle with the Rook you would have to specify isjO2 . (I used the j for this, which normally means 'jumping', because in a sense you jump over the Judge while looking for the castling partner.)
For user input the diagram is not very pedantic, and allows you to castle with the Rook anyway, but it allows every other illegal move as well, so that doesn't mean a whole lot. As it is the AI would never castle with the Rook, however.
Note that the castling move that is now defined for the King (isO2) describes castling with the furthest piece in that direction. Which in this case is the Judge. If you would want it to castle with the Rook you would have to specify isjO2 . (I used the j for this, which normally means 'jumping', because in a sense you jump over the Judge while looking for the castling partner.)
For user input the diagram is not very pedantic, and allows you to castle with the Rook anyway, but it allows every other illegal move as well, so that doesn't mean a whole lot. As it is the AI would never castle with the Rook, however.