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The book is interesting for every beginner or intermediate SUDOKU solver. The exercises are each in a single page allowing place to write posible candidates in every square. Only they are not at all devilish as the book says but only dlfficult with many examples only internediate. The explained strategies are few and the easiest, missing many more that make a sudoku really difficult, as y-wing, xyz-wing, xy-chain, x.cycles, Medusa,simple coloring,four special types of unique rectangle, and much more.