Road to the Grandmaster title - Mastering intermediate checkmates

Yesterday I studied the 1st book of puzzles from Iosif Slavin. It is a collections of basic checkmates of 1, 2, 3 or more moves. I solved 260 puzzles in 2 hours.

I wish to improve my calculation skills to be as good as the great Garry Kasparov's skills.

He just gave a smothered checkmate on f7:

 I share a few checkmates with you.

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