if your tired of getting crushed by zerglings at the begining then stop building offense at first.you need to build cannons if your protoss and bunkers with at least two marines in one.after they attack you you know they kill you but you gotta have a surprise for them.after building defense bild a small offense for when he comes back.then build a massive air strike and take him out.BAM the game is over and you won hahahaha