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In principle, we seem to be able to defeat the strongest turquoise player when we reach the surface. But I think it varies from game to game – it's quite possible that if we load the game again and reach the garrison, the red player might not be locked in, but on the other side of the map: we should try both a rush and a build-up strategy to gather statistics.
Yes, of course, I built it – extra gold is never a bad thing.