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Part 1.
The basics of the gameplay.
First, you need to read the rules. And also save them along with the save file. And reread them from time to time. If some points are not quite clear, write a personal message to the tournament organizer.
Second, you need to open the map (specifically the map) in the editor and carefully study it. This has already been discussed.
Third, you need to open the save file and also carefully study it.
Remember, without reconnaissance, there will be no good results!
And now, another extremely important aspect. FORGET about how you played up to this moment. A scheme like "in the first week, I will build a town hall, in the second, I will try to build a capitol, and then I will build troops and it will be easier" does not work on the vast majority of maps!
And what does work, you ask?
The "here and now" approach works, that is, a specific game on a specific map. There are, of course, many options, but you can try to mention some of them.
-) playing for different types of joining. Depending on the conditions for joining, you may need: an army, hero upgrade features, gold. Accordingly, we build the game around this.
-) playing to acquire key spells. You may need: wisdom, a school of magic, an army to obtain the spell (capturing resources to build a guild, capturing a utopia with a book of the corresponding magic, breaking through the guard of an artifact or Pandora, etc.).
-) rush. A rapid run across the map without being distracted by details. You need heroes with an army or with magic.
Of course, there are many other cases.
Part 2. Well-known truths.
To be continued...