The Stonewall is an ideal choice for those players who are keen to avoid the reams of theory that surround more popular openings such as the King's Indian and Nimzo-Indian Defenses. By playing the Stonewall, Black stakes an immediate claim in the center and lays the foundations for a potentially dangerous kingside attack. The route to success with the Stonewall is very much based on an understanding of themes and ideas and these are clearly elucidated by experienced author Jacob Aagaard.