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Try to solve this puzzles! If you will solve 3 of 3 you are CM

ChessPuzzleLichess
Very hard ;)

In this study 3 etudes. If you can solve them all - your level of chess in very good!

Good Luck!

https://lichess.org/study/aL6KIG0a/nFKc5sMi

If this post will get 100 likes I will present you more beautiful puzzles!