Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Excellent book on chess variants

David Pritchard, author of The Encyclopedia of Chess Variants, has written a book that features 20 different variants of chess. Variants are given with rules, historic comments, and with examples of play. These are often very illustrative and interesting.Most variants are playable by two players with a usual chess set; in addition, shogi and xiangqi (Japanese and Chinese chess) are given. Overall, a book that I liked a lot, although The Encyclopedia of Chess Variants contains much more information.