what does plus 2 mean

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samwri
I was watching the interviews of the tata steel tournament and they kept talking about being plus 2. So what does it mean to be plus two.
Homsar
It means you have 2 extra points of material (ie: being up a rook for a knight, or maybe being up a bishop for a pawn). It could also be referring to being up 2 positional points, which I believe would mean your position is better to the point of it being worth 2 points of material.
FSTIMJP

Plus 2 generally relates to the number of game points. 2/2, or 3/4, or 5.5/9, all those are "plus two".

Kev74

How is 2/2, 3/4 and 5.5/9 all "plus two". What's the logic behind it?