How come some stalemates give you points but others take it away?

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NoahDr
How come some stalemates give you points but others take it away? It seems as if no points should be added or deducted.
JustOneUSer
It depends on the rating/ skill of your opponent- if you were expected/should have beat them, but drew, -1. If they were expected to win, but you drew, then +1 to you. Extreme cases go to +/-2. If the two of you are very similar skill, then you will gain 0, loose 0, as a draw was expected.