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I just finished the scenario Walkthrough.
I played on version 1.6, on Veteran difficulty.
The Walkthrough took: 2 real days, 11 in-game months.
Basically, here's how I did it: at the beginning, I go to the Sphinx and take... what do you think? - no, not 15,000 experience, but 20,000 gold, because I like to earn experience myself, and besides, money won't hurt either, especially at the beginning. In general, in the following three weeks, I leisurely (that's putting it mildly) build up my city, gather troops, and around the beginning of the 4th week, I go to the Dungeon, after first clearing out the Pyramid. Then, for another 2 weeks, I explore the Dungeon and finally emerge onto the grassy territory. By this point, I was already level 18, so I reach the end of the grassy path, and then Zoltán himself teleports to me via Astral Gate, and with an army that poses a medium threat (well, of course, he had been stalling for so long, he already had three cities), I decided to defeat him, but I failed a bit. Zoltán actively uses Berserk and Subdue, so I decided to wait and ran to my Castle for reinforcements, and also bought the artifact, Shield of the Dwarf Kings, you know why. Zoltán also didn't waste time and teleported to his Castle, also for reinforcements. While he was hanging out on his territory, I quickly reached the upper right Magic Castle with my Logistics and Astral Gate and captured it. Zoltán headed after me, apparently to give me a beating. When he arrived, he didn't dare attack, but I finally dared to attack, and the battle began.
Our stats at the time of the battle:
Zoltán: Attack 18, Defense 24, Magic 21, Knowledge 11
Maahir (me): Attack 11, Defense 14, Magic 16, Knowledge 31.
The first screenshot is the beginning of this battle.
In general, I won (thanks to mini-artifacts for luck, which triggered very often), although I replayed it 4 times to minimize losses, because I still need to deal with Orson. After this victory, I didn't encounter any serious resistance and gradually completely defeated the blue player. On the one hand, the map is convenient because the blue player can't escape from his territory when I start to put pressure on him (well, usually ten enemy heroes run around the map, and you don't have time to defend the castles, but here there is none of that, because of the landscape), on the other hand, it is quite difficult to reach the enemy's castles.
The first screenshot is the battle with Zoltán, and the rest are the end of the game, i.e., approximately the 11th month.