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coan.net: You can make the same argument that if you capture your opponent's king and get destroyed by the Behemoth that you should win, since the capture takes place first, but that's not the way the rules are either.
Personally, I don't think Behemoth Chess is a good game. I would never chose to play it. I did play it once as part of a tournament with random game selection. I won't play it again. Maybe some casual players like it, but there are far better games to play.