Have you ever experienced crashes or game freezes during gameplay?
Gunnar left the game, saying his child was bothering him (yeah, right).
We continued and finished the game. Later, I looked at that day, it was day 124. He was standing next to the Stronghold castle without a Guardian, and there were no weak units nearby to check it. There was only his main and semi-main Necromancer units. So, in general, that was the maximum he could achieve. And he couldn't take the castle.
But he did take castles on days 2-3, with a fight, but to keep up the pace.
I can't say for sure that he was useless and lost, but I've been playing Heroes 3 for many years now...
I won't play with Gunnar anymore, and I don't want to meet him in tournaments.