Play chess online for free - chess.org
chess.orgPlay against computer – in case you do not want to play against human opponent, you have the option to play chess against computer. In addition to the settings described earlier (e.g. piece color, game clocks etc.) there is one more setting which allows you to choose from 8 predefined levels of AI strength (1 being the easiest, 8 the hardest).
SparkChess: Play chess online vs the computer or in multiplayer
www.sparkchess.comSparkChess is an excellent way to get better at chess - learn the proper rules (including the elusive en-passant), practice openings, test strategies, use the board editor to recreate famous positions with FEN strings, replay famous games, import/export PGN games and databases (with comments and annotations) and let the computer help you.
24/7 Chess
www.247chess.comChess is a classic strategy board game that comes to life online with 24/7 Games' first chess game - 24/7 Chess. You can now play chess versus the computer or with a friend whenever and wherever you want! Play today immediately on all of your devices using your favorite internet browser - 100% free with no app download required!
24/7 Chess
https://www.247chess.comPlay today immediately on all of your devices using your favorite internet browser - 100% free with no app download required! Escape the mundane and exercise your brain with 247chess.com!