A program for calculating the strength of the guard on random maps in Heroes of Might and Magic III, called H3CalcGuards.

We were playing Jebus with weak guards, difficulty 160. Last time, when playing Necropolis, we got Pandora with 15 Vampire Lords for 14 Horned Demons, and it matched the table. This time, there were 19 demons, which is outside the allowed range. There's only one Necropolis town on the map. Is something else not being taken into account?