question about leaderboard

[big league chew]

whats the formula for calculating "points"? ive heard a lot of different answers, but no "official" nihilum answer has any good reasons why stuff like this happens

this is just an example, happens all the time if you look carefully
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6+ hours after last killed Elvish is worth 2 points, 18 minutes later worth 3 again? just tryin to understand the math

eldermath me plz