Pro version of the application to solve chess puzzles and improve your chess skills.

Features:
- more than 150 000 chess puzzles;
- mates, tactics, combinations in the middlegame, tricks in the endgame, everything you need to become stronger;
- multiple types of puzzle competition (ultrabullet, bullet, blitz, rapid, classic, survival, no time-limit);
- leaderboard (today and all-time);
- own highscores;
- statistics/analysis of your strengths and weaknesses, pros and cons (in Pro version);
- dynamics of your rating.