Rules for online games in Heroes III and the seasonal Ranked Tournament.

If the guard protecting the passage between zones is moved deeper into the adjacent zone, it is allowed to enter that zone to eliminate it. If there are multiple guards protecting the passage, it is allowed to enter the adjacent zone to eliminate any guard of the player's choice. In these cases, eliminating the guard must be the first action in the new zone.

It is possible to enter a guarded zone to break through the passage guard if entering the zone and attacking the guard is done in one action, without intermediate stops, overnight stays, or interaction (visiting, collecting, attacking) with any objects in the guarded zone.

Transition between zones using the Angel Wings artifact and the Fly and Dimensional Gate spells is allowed:
c) in cases of multiple guards of one passage - to approach the guard chosen by the player, with the elimination of this guard being the first action in the new zone.

If Dimensional Door is available, it is possible to teleport to a cell in the guarded zone next to the guard and immediately attack.