Ads are not annoying. Game is fun and challenging at the start, but it reaches unfair positions soon. Usually you have only knights and maybe 1 bishop in front row when the opponent has mostly bishops. Best you can do is block with even trades, if you are lucky with starting position. After that you end up with fewer queens, rooks and can only wish that AI blunders, which it often does. Hoping that opponent makes a blunder is not fun way to play chess. Too much luck involved.