Najdorf
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On the internet
you can search it on wikipedia or get garry kasparov's fritz trainer dvds. he made 3 dvds worth of how to play the najdorf. also, you can get a copy of modern chess openings book which has most or all of the main openings. there are two extremely large sections. one is dedicated to the ruy lopez and one for the sicilian with a nice section on the najdorf and its variations. this book should be easily found in a local library. good luck.
Where can I find good information on the Najdorf?