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  3. WhiteRatingDiff?

What do the tags WhiteRatingDiff and BlackRatingDiff mean in the PGN files from Lichess?

I've searched google for an explanation but didn't find anything.

It's the number of rating points gained or lost in the game.

Rating change (gain/loss) after game conclusion.

Ah, ok, thanks.

What a bizarre thing to put in a pgn file.