Ideachess is a free site that aims to help chess-lovers improve their game by solving online interactive checkmate and tactics puzzles. The main feature of Ideachess is a built-in real-time tactical chess engine that immediately refutes wrong solutions. Registration is free, and allows you to track your progress with statistics and graphs, to evaluate your abilities by the Glicko Elo rating system, to have exercises assigned to you based on your actual strength, plus much more. - Read more