I think what H. G. Muller meant by that was that the play-test applet treats the king's castling move as if en passant applied for the purpose of checking whether the king would pass through check or not, and this can't be extended to leaping.
It's a limitation of the way the applet works, not a misunderstanding of the rules.
I think what H. G. Muller meant by that was that the play-test applet treats the king's castling move as if en passant applied for the purpose of checking whether the king would pass through check or not, and this can't be extended to leaping.
It's a limitation of the way the applet works, not a misunderstanding of the rules.