The Sixth edition contains 3,198 diagrammed positions, which are divided into chapters by motives - pinning, double attack, interference etc. The combinations are ordered by difficulty into 3 sub-levels: Basic, Intermediate, Advanced . All examples are diagrammed, with names of players, place and date of the event and annotated solution within each chapter. Indexes of players and annotators at the end. There is about 25 percent new material compared to the 2014 5th edition. 3 pictures.