[HoMM IV DUEL TOURNAMENT ON] "Snowstorm"

P.S. Is it allowed to attack with 1 unit before the battle?

Of course not. Firstly, you learn the location, and secondly, you remove the castle bonuses. But I have another question: who is obligated to attack on the clearing?)) That is, who will be the attacker and who will be the defender? This also depends on a lot. I suggest determining this immediately, depending on who is the host and who is not. For example, to compensate for the host's better position due to race selection, which LeSHiJ rightly pointed out, we can offer the "non-host" a choice: to attack himself or to give that right to the host. What do you think? By the way, another question: who will determine who is the host and who is not? I would generally agree to always be the host.)) Because it's not that much of a hassle to be the host, considering the speed and quickness of the connection (you won't have to reload the save again, etc.), and there is an advantage to being the host.