I just tried to go to goproblems.com and got this:
Is goproblems.com dead? 
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that’s the same thing you get at josekipedia - seems like a server upgrade might be going on
goproblems went out a couple of times during my go life, and eventually came back every time, so don’t lose hope.
In the meantime:
https://blacktoplay.com/
https://tsumego-hero.com/
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It’s back baby! 
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…as the ancient prophecy foretold! 
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