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How tarining puzzles are being selected?

Is there any automatic system to select puzzles we find in training? or does it just pick random games?

Is there any way to can know if one of your games had been selected for the trainings?
The ones with a number above 60k and counting is being generated by this github.com/clarkerubber/Python-Puzzle-Creator it gets recently finished games from lichess filtered by a criteria and then searches for good puzzles.

Here's the criteria github.com/ornicar/lila/blob/0200a19be24ceede86599908003bff096558693a/modules/game/src/main/RecentGoodGame.scala#L11-L17

It tries to find rated games with at least 10 halfmoves/ply where each player has about at least 5 minutes, and prefers rating over 1900 or over 1700 if the queue is somewhat empty. If it fails it will select a random recent game instead.

I think the ones between 0 and 60k was created with this github.com/clarkerubber/problem-creator

There is currently no way to find out if any of your games was used

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