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First of all, it’s really necessary to figure out which version to use. Playing on different versions isn’t the best option. For international tournaments, the original version of Heroes 1.1 is ideal (I’ve heard about an official patch 1.2, but haven’t had a chance to find it yet). The differences between the Russian and Hungarian versions can be significant for gameplay. After all, the localizers even managed to interfere with the gameplay (they didn’t even remove the debug information).
The tournament promises to be interesting.