That's not what Tamerlane II succession does. In Tamerlane II, as you already described, when the King is in a checkmate position the player may exchange the King's location with the Prince's. This is, basically, abdication in favor of the selected Prince; the King becomes a Prince, and may remain in play. What I described is the King being removed, automatically making the Prince into the King, kind of like what recently happened with Elizabeth II and Charles III.
Anyway, the Nightrider problem was a matter of me miscounting. It should be fixed now.
That's not what Tamerlane II succession does. In Tamerlane II, as you already described, when the King is in a checkmate position the player may exchange the King's location with the Prince's. This is, basically, abdication in favor of the selected Prince; the King becomes a Prince, and may remain in play. What I described is the King being removed, automatically making the Prince into the King, kind of like what recently happened with Elizabeth II and Charles III.
Anyway, the Nightrider problem was a matter of me miscounting. It should be fixed now.