In the rule as you see it Bob, I understand that the checkmated King is removed but no attacking piece is moving on its square. Imagine White King is checkmated and that, in checkmating, Black is eating a piece. As he also removes the white King, Black is actually taking 2 pieces in a single move. That was probably my problem. This is why, I said that the White King is becoming a White Prince.
In the rule as I'm trying to implement it, for the succession on White's side to be triggered, Black has to actually take a turn to capture the White King. Then the White Prince immediately becomes the White King.
In the rule as I'm trying to implement it, for the succession on White's side to be triggered, Black has to actually take a turn to capture the White King. Then the White Prince immediately becomes the White King.