Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Its tips are not terrific

I bought this book for the "master class in advanced strategies," not for the puzzles, and I was disappointed. The tips are skimpy and not very clearly explained. I have a Ph.D. in philosophy (which includes logic), so I am no dummy, yet several of the solving tips in the opening section I had to read three or four times until I could correctly correlate the commentary to the diagrams. If you're looking for difficult puzzles, then read the other reviews, but if you're looking for solving methods for difficult puzzles, don't buy this book.