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Slightly difficult to disentangle is that they might be using the verbalisation as a way to explore depth, rubber-duck style, in a way that they wouldn't over the board.

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This video disproves that theory, it's a GM explaining the analysis he performed during a game he's just played in an interview:

https://www.youtube.com/watch?v=pUgvAoTzWBA

But you can still verbalize without saying the result of it. But yeah, it's still a question whether they would do so, but I think they do.

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