The pressure can be defined as your agressivity or your offense ability on your rival.This can also named as continious attacks against your enemy with real or fake movements.The main purpose of pressure is making the game difficult for your enemy so it will create extra load on your opponent which may result an easy victory for you.Here the most important factor is the pressure’s efficiency which must not be so difficult for you to create the sufficient amount of pressure while the enemy order is shaken by your pressure.The low efficiency of the pressure means that your pressure costs are too high or that consumes very high amount of focussing on it which recedes you from macro or micro jobs.If you do not create any pressure on your enemy the enemy will develop whatever he wants and will be absolutely dangerous for your victory.So always the pressure must be present but the amount of it can be unstable according to your focus need dependent to your macro or micro jobs.Sometimes only high pressure can give you victory but if you do not set the amount correctly you may fail.