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Why is there 270 Million Games in the Lichess Database but only 40 Million in Opening Explorer ?

An access to all available games would be good. If it is impossible, I'd like to know its reason.
just a guess but the opening explorer seems to stop being applicable after several moves, maybe the DB for it only maps out a few moves and there are only 40M unique combos?
Right, there are more than 1 game in many lines.
When you play a game you can see the same game a few minutes later in the Opening Explorer. So the system works really well.
So ? Why is there 40 million games in the explorer but 270 in the database ?
Isn't the Opening Explorer only indexing rated games where the average rating is >1600? From searching in the games explorer, 40 out of 270 million seems about right for the number of games meeting those requirements.

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