_RaelaG_
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Well, I completed it without any problems; I just used a simple trick: at the very beginning, I focused on capturing as many mines as possible and didn't take the first castle (the AI has money and resources). I waited for about 8-9 days and then took it.
(Not only does it build basic structures like a market or a forge, but if it's lucky, it will also build high-level units.)