I plan to just go with a conventional "extinction royalty" rule, possibly with an added rule that the King has to move out of check if possible. Even with that change, though, the automatic promotion of the Prince to King upon the original King's capture makes your second paragraph still correct.
I plan to just go with a conventional "extinction royalty" rule, possibly with an added rule that the King has to move out of check if possible. Even with that change, though, the automatic promotion of the Prince to King upon the original King's capture makes your second paragraph still correct.