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It's a shame that an interesting question got lost in all the nonsense: how do computers sometimes defeat neutral creatures with losses comparable to those of a highly skilled player? It's a good idea, making the computer stronger, but what's the underlying mechanic?
Added 4 minutes later
By the way, it's quite possible that the computer simply bought meat and moved it somewhere, leaving the town unguarded. This may be a rare, but quite possible scenario. Especially if the hero could run into the darkness and Belendor simply didn't notice him...
"Никто не уходит из героев вечно", - убедился на личном опыте, гоняю в сингле до сих пор :D