You can download Fine’s Ideas Behind the Chess Openings HERE. To read this book you will need to download the free WinDjView program. Don’t let the facts that this book is in Descriptive Notation or that it was published in 1943 prevent you from reading it. It is still a good book for getting an understanding of the basic strategy behind the openings. Here’s a sample page:
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Here's s miniature won by Fischer against Fine. It was an offhand gameand the only one they ever played.