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First things first. I believe registration is fully working. As in, it'll send you an e-mail now. I hope.
Second, fun bug reported by JT. If you beat another player with zeny that's less than zero, it'll make their zeny zero and give you their debt. Not so fun for you, obviously, so I made it so if they are in debt, you don't win anything. Obviously that's not fun either, but it's more fun than losing zeny.