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All resources were selected, and during his turn, the opponent leaves and writes that his Hydras are blocking the path. I asked for the password, and the opponent immediately went offline in the game. He reappears after a few minutes (pinging perfectly in Hamachi the entire time), writes that he had internet problems on his computer, and gives a password that doesn't match the save (the save is attached; the password for Red is 3210, and Blue said his password is 114422).
If it's possible to somehow open the save and it turns out that there is indeed a block, I'm ready to remove the suspicion and withdraw the report – but something tells me that this is highly unlikely.
The purpose of this report is to warn others. I think that not only me is annoyed when someone cheats in a game based on trust.