Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A "must" book for any player looking to improve!

"The pawn is the soul of chess." - Philidor, over 200 years ago. One learns about duos, the ram, chains, levers, fork tricks, pawn structure and more. The structure of pawns actually dictate the placement of all other pieces. Quite a lot of power for the little foot soldier, as pawns are often called. Master players win many games because of weak pawn play by the opponent. This would be on my list of the first 5 books one should study