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Honestly, random maps cause so much trouble, when you can just choose a normal map, made by hand, specifically balanced. I suggest choosing a well-known map; for Heroes 5, I suggest Dragon's Cape:smile20: (you can find it on Igromania, or I can send it to you by email). The map is well-balanced, has many artifacts, and allows for both fast and long games. Both players have enough experience to get the Supreme Artifact.
But in general, I think it's not worth focusing only on the generator; there are excellent maps that deserve attention:smile20: