The whole mastery plan consists of 18k puzzles. Split by each tactical concept, each piece, each square.
Example: Unique chess squares: 64 Topic: M1 Unique pieces: 6 Puzzles: approx. 6*64
The coverage of squares is 85%, as some moves are mathematically impossible, and for some exotic positions, I did not find any quality puzzles.
Have fun and master chess!
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