The Queen's Gambit Declined has been the workhorse for many if not most of the World Champions. The well prepared player of the Black pieces can feel secure in the knowledge that the slightest mistake by White can yield full equality and even if White knows all the moves his advantage will be microscopic. In addition to the standard lines, this book contains a number of interesting suggestions that have never been implemented. This book has been updated with a supplement containing the latest games and grandmaster analysis in 2012.