Chess King Complete 25 is a combo of the most important chess courses, levels 1 - 9 [Rating 200-2400] in all areas of chess (Openings, Tactics, Strategy, and Endgames). They are the best courses that millions of young chess players have gone through and which have brought many of them to the level of master and grandmaster. There are over 100,000 exercises and examples for all areas of chess. You can access the courses directly in any web browser or on any mobile phone or tablet via the free Chess King App,