This week, Lee Sedol, the famous 9 dan professional Go player, was beaten three games to zero by AlphaGo the Go-playing computer. This surprised everyone, because computers kind of sucked at Go until about 3 months ago, and now suddenly it seems we have a computer that's nigh-unbeatable.
I'm a programmer, and I also play Go (badly). One would think that my feelings would be mixed, something like "Yay programmers! Too bad, Go players!" But in fact I find that my feelings are all sadness. I feel like we've lost something.