Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Wow!

I have not finished this book, but I was moved to write a review of what I've read so far. Outstanding. I often hear that Alekhine was a great annotator. Bah, humbug! As far as I'm concerned Keres is the model of a perfect annotator, at least for a player below expert strength. The variations provided are plentiful and deep enough to provide food for thought without being overwhelming (unlike say Kasparov's MGP series, which has encyclopedic annotations of some games, which overwhelms the non-master). Beyond simply citing moves, Keres delves into the intricacies of the positions, explaining plans and strategies. This book will help anyone's game improve. Can't wait to finish, and I'm going to buy Vol 2 immediately.