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An interesting guide on strategy in Heroes III, in English. 65 pages.

Indeed interesting, it's a pity it's in English. But there are some inconsistencies with the official game mechanics – for example, the probability of spells appearing in the guild. Perhaps there's just a different calculation principle, but it could also be something else. Without a proper translation, it's difficult to understand right away.
It's interesting, which one is more accurate?