It is not difficult to understand why The London System is such a popular chess opening with club players. Against virtually every Black defence after 1.d4 it offers White an easy-to-learn and reliable set of lines with interesting choices between strategic or more aggressive approaches, while avoiding tons of opening theory. In The Agile London System Alfonso Romero and Oscar de Prado present both historical material and recent top-level examples to provide a comprehensive overview. They explain the typical plans and tactics, provide lots of exercises and reveal the secrets behind sharp ideas such as the Barry Attack, the Jobava Attack and the especially aggressive Pereyra Attack.