If you are a chess enthusiast who loves to solve chess puzzles, then you might want to check out the "Шахматы. Жертва на F7 free" app developed by AK Development. This app is specifically designed for Android users who are interested in solving chess puzzles ranging from 2nd category to Candidate Master of Sports (CMS) level.

The app offers a vast collection of chess puzzles that you can solve to improve your skills. Once you solve a puzzle, you can check your solution against the app's answer. The app also provides hints and tips to help you solve the puzzles, making it a great tool for chess players of all levels. The interface is user-friendly, and the app is entirely free to use. Overall, this app is a great choice for chess lovers who want to improve their skills by solving challenging puzzles.