The best defense is a good offense
"The best defense is a good offense" is an adage that has been applied to many fields of endeavor, including games and military combat. Generally, the idea is that strong offensive action will preoccupy the opposition and ultimately hinder its ability to mount an opposing counterattack, leading to a strategic advantage.
Mao Zedong opined that "the only real defense is active defense", meaning defense for the purpose of counter-attacking and taking the offensive. Often success rests on destroying the enemy's ability to attack. This principle is paralleled in the writings of Machiavelli and Sun Tzu.
In some board games, such as Risk, one's ability to build up armies depends on aggressively attacking so as to acquire territory; however, in Risk, luck in rolling the dice is the ultimate determining factor. Players who fail to do so, and concentrate instead on holding the line against enemy attack, will likely end up in a weak position. In-depth info argues that this adage does not always apply: "When the battle rages between two players one should put every ounce of power in the offense, but when several players are involved, the political element changes this dynamic." In chess, one's ability to prevent enemy attacks often depends on maintaining the initiative – i.e., making a series of threats that the opponent must use his turns to parry, rather than launching his own attacks; thus, common tips used in conjunction with this adage are that the best way to upset your opponent’s plans is to become menacing and that the best way to stop an enemy threat to your own king is to attack his.
In sports such as football and basketball, the adage is used to note that success can hinge on an effective offense that keeps the ball on the other team's side of the field, thus not only creating scoring opportunities but preventing the opposing team from scoring.