DISCUSSIONS on “Rules for online games in HoMM3 and formulas for calculating player rating.”

On all templates, except for the XL+U size templates:
2.6.1. To pass from one zone to another through a specific passage, it is necessary to eliminate the guard of that passage. If there are several guards on the passage, it is enough to destroy any one of them.
2.6.5. If there is no guard on the passage, it is allowed to freely move from zone to zone.

so, it's a tech loss if the map is a CMK map.