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What is missing in the chess insights?

Hi, I just noticed that the Avarage Opp Rating in the profile screen and chess insights are quite different. For example. In my profile bullet page, it writes as 1631.15 but in the chess insights page it writes 1694.81

Then I noticed that the total game counts were different. For the bullet profile it was 13,281 games, chess insights calculates 7,745 games for bullet.

But chess insights has also last 10 years for filter. So it shouldn't be a date issue. So which games are missing in the insight? Is it random or is it the oldest 5K games? And if so why?

Thanks.

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