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Ideally, the game files and save files should be stored on a server. Then the issue would be resolved once and for all.
In its current form, I think that checking files between players is a more achievable option for Heroes.
If it were possible to record a full replay (the entire sequence of actions during a turn), even locally, and then exchange replay data after the game, it would significantly complicate cheating (including in-game cheating) and would be useful for learning and analysis.
But all such discussions without a moderator are unlikely to lead to anything at the moment:)
Of the things that can be realistically done without changing the game: require players to upload daily save files by default after the end of matches (at least tournament matches). The size of these files is not that large; storing them for a month should not be a big problem. It's not the best solution, but it will increase the chances of catching cheaters.
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