Instruct: Classify Amazon reviews into positive or negative sentiment
Query: This is important

First,I don't have this book.I have 'The latvian Gambit a grandmaster view' by Anatoly lein and sid pickard.The publisher is Hays Publishing.For all young players,don't play this opening.1.e4 e5 2.Nf3 f5?!It is very risky.I am not against whether you want to but the book or not,but the opening is not good.