DVD Four concentrates on attack and defence, space and time. I.M Andrew Martin will teach you skills that will help you understand when to attack and the important of avoiding premature attacks.
In order for an attack to succeed is you must have a lead in developement and space. Timing is vital, so take advantage of opportunities and attack with as many pieces as possible. When defending you must create counter playto keep your oponent off balance and value of patience which is often overlooked by the average player