40 chess puzzles were shown to a panel of players ranging from occasional club players up to Super-GM and co-author Michael Adams. Researcher Philip Hurtado recorded not only the moves chosen, but also the detailed thought processes of every player in order to shed light on the mystery as to what exactly defines superior chess strength.

This book offers a unique opportunity for readers to not only solve the puzzles, but also compare their thinking to that of club players, strong amateurs, IMs, GMs and Michael Adams himself. With an additional Bonus Puzzle section and a fascinating Eyetracker experiment showing where different players focused their attention on the board, this is a chess improvement book like no other.