Kniga Kak Igrat V Shakhmaty Skachat Here
by Sergey Ivashchenko: A great practical choice for solving puzzles. You can find PDF versions of Chess School 1a which focus on fundamental tactics.
You can legally access many of these titles through the following digital libraries: kniga kak igrat v shakhmaty skachat
These classics are widely available as free PDF downloads on sites like the Internet Archive and various chess portals: by Sergey Ivashchenko: A great practical choice for