I purchased this book for my 9 year old who is in the 4th grade. He has played in a couple of chess tournaments through is school and gets As and Bs in school.However, he expressed great disapointment when I purchased this book for him after he spend two days on it. Therefore, I look at it in detail and found my poor son had been reading a very poorly written book, that as an adult I found poorly organized and certainly a book with moderatly difficult concepts poorly explained.Stay away from this!