Everything depends on the pulleys here, believe or not! Watch out which end of the equipment you sit on!
How to use?
Ask someone who seems stronger than you to pull the rope from the side where is only one pulley. Ready, steady, go!
The more pulleys are, the less energy you have to produce less energy, this is why you can win the competition of the tug of war! However, this may mean that you have to pull the rope for longer time. According to physics, the completed work is the product of the produced energy and the road completed.