"...The second possibility is that mercenaries surround the king from three sides and the throne stands on the fourth side (since nobody, including the king, cannot move to the throne). The black player wins the game."
So the game should have ended, and the white player should not have had to resign, correct?
(hide) If you want to play a game with an opponent of a similar level, you can define a required BKR range for a new game invitation. Then nobody with a BKR outside this range will be able to see/accept it. (Katechka) (show all tips)