NHF – new heroes for Heroes V 3.1.

Maybe include all monsters within a 2-tile radius of the portal?
What is IRMG? So much has been said about it, but I don't even know what it is!

The link to IRMG is in the first post. It's an alternative map generator for Heroes of Might and Magic, which is used for tournaments in the Russian-speaking community.

Added after 48 seconds
I think the optimal solution is to shift the active tiles for the portal.

Added after 2 minutes
Just need to be careful so that you always have to fight the monster behind the portal.

Added after 6 minutes
Although it seems that the portal always has a check for closing in the same place, regardless of whether the exit from the portal can be set to another tile.

What if the function that checks the distance to the portal starts to lag?