凡战者,以正合,以奇胜。奇正相生,如循环之无端,孰能穷之哉!故善战者,其势险,其节短。势如扩弩,节如发机。……任势者,其战人也,如转木石。木石之性,安则静,危则动,方则止,圆则行。故善战人之势,如转圜石于千仞之山者,势也。——孙子兵法 Where the warriors, to coincide, to win the odd. Odd appearances, such as endless circulation, which is poor of the zai! Therefore, belligerents, its potential risks, its short section. Potential expansion crossbow, section such as hair machine. ... Any potential person, its warriors also, such as turn wood. Wood of the nature, security is the rule, danger is moving, while the rule, the circle is OK. Therefore, the trend of good fighters, such as turning the stone in thousands of mountains, potential also. --The Art of War