A box rule which specifies a maximum overall size for boats in the class, as well as features such as stability. That could go head to head in attempt to find the best sailing crews and teams. These rules allow one boat to try to attack the other by getting the other boat penalized so that it has to do what is called three sixty (this is turning the boat three hundred and sixty degrees around or as the rule that states, one tack and one gibe in the same direction),[2] which then puts the penalized boat at a large disadvantage compared to the others.