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I'm very curious about how it calculates the score, but I can't find an explaination. I know nearer is higher.

I only tried it briefly last night so I'm not sure about this, but probably (circumference of the earth) - (straight line* distance between guess and actual location)

A bit more experimentation should reveal the real answer.

*I'd have thought they'd use great circle, but no: it's just a big straight line on the map.

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