BOOK 6 - ATTACKS ON THE KING IN THE CENTER
 The king in the center is a concept that has found its way into the chess lexicon, but it is not very precise. In fact, when we talk about attacks on the king in the center, we mean that the attacked king is on or near its starting square. This square (or position) doesn't have much to do with the geometric center of the board, only the center of the last (or first) row, and it would be more logical to refer to this piece as a king without casting, or something similar. But we respect the expression because we think it's a commonly understood place.
 The exercises in this booklet illustrate the topic studied in chapter 8 of Chess School and chapter 7 of Chess School 2.
 Students should bear in mind that when solving the exercises they are not asked to decipher every single move in the game (which are sometimes included until the end, for documentary purposes), but only those which lead to a decisive advantage for one side (+ -, - +) or, where appropriate, to a forced draw (=). There are exceptions (and in this sense the guidance of an instructor or the reader's own common sense is important), because if the first or second move gives this impression, it is up to the solver to provide additional concrete lines that enrich the solution. Chess is not a mathematical science and allows different interpretations.
 Only one formula is known for progress in chess: play as many games as possible, together with theoretical study and analysis of the games themselves. The ideal complement to this formula, as many great masters recommend, is for the player to develop and perfect his tactical and strategic skills by solving numerous exercises, specially selected for their usefulness. Like the ones we offer here
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