Kind of hard to make a recommendation unless we know what you want it for. You just want a faithful computer opponent? A professional level database? Something to analyzes your games? Puzzles and tactics. Can it be really hard to learn or is easy important? Cheap or free? Fritz, HIARCS, ChessKing...Scid, Stockfish, Arena.
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Which chess software is the most helpful for you that is under 100$? Thanks!