The Chess Toolbox de Thomas Willemze
"The Chess Toolbox teaches you how to: conquer an open file, eliminate an important defender, lift a blockade, get rid of an inferior piece, exploit the 7th rank, simplify your position (why and how), fight for entrance squares and much more.
In order to make you feel comfortable and let you get used to these essential techniques, the author gives lots of fascinating examples and hundreds of instructive exercises. He even teaches you how to think outside your toolbox!"