What/why are players writing after every move?

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Avatar of kinghumper

Why do players (I'm watching Gukesh/Ding game 6) write on a paper after every move?

Do they not know that their every move is already well documented?

Avatar of TheEloCollector1
It’s a thing
Avatar of TheEloCollector1
They write down what move they played
Avatar of TheEloCollector1
In most competitions, they write it down