It's a dog-eat-dog world, eh? :)

Anyway, I don't see how this relates to the original discussion. Nor do I think the irony is particularly deep: As far as I'm aware, Deep Blue didn't plagiarize Kasparov, and indeed alpha-beta search is quite different than how humans calculate. But yes, I'd have been very demoralized if I were Kasparov, although he seems to be doing well now.