The Ultimate Chess Puzzle Book - John Emms - Bog

It is generally agreed that one of the best ways for a chess-player to improve is by constant practice and testing. The puzzles in this book provide a wealth of positions to test every facet of the reader's tactical skills, and have been selected by analyzing games new and old in search of original puzzle positions (rather than simply trawling through previous puzzle books as is all too often the case). It is therefore very unlikely that even seasoned solvers will recognize many of these positions!