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Is the use of databases permitted on RHP. I do not think it should be.
Reuben Fine has an excellent book, "Chess: The Easy Way," in which he expounds on ten priniciples of the middle game, as well as ten priniciples of the opening and endgame. Highly recommended.
London
One tip I was given as a strategic fall back position i.e. when you really can't think of anything...try to improve your worst piece
