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This trick comes up across many different martial arts styles. In both judo and wrestling, the tug-of-war trick is a great preamble to a sacrifice throw, where your opponent leans into you, but instead of pushing back, you just take a seat on the floor (and possibly stick your foot into his stomach, depending on the throw). In some striking styles such as kenpo or muay Thai, if your opponent blocks your punch to the inside with too much force, you can let your arm go limp at the elbow. This can lead to your opponent clearing his own opening for that elbow of yours, which is already halfway there by now. This same block sensitivity is an important part of chi sao drills in wing chun and jeet kune do. These drills work by maintaining hand contact and feeling for excessive pressure in any direction from your opponent, before ultimately allowing your opponent to move his own hand out of the way with that excessive pressure while you strike. Stealing a free lunch is wonderful, and there is some ironic “stop hitting yourself” justice to it, but just like any other kind of theft, stealing a free lunch during a fight is a crime of opportunity, and there is no guarantee you will have that chance. You should approach any situation prepared to spend your own energy to get out of it, but if your opponent is going to leave his lunch sitting on the table, you should definitely eat it. Personally, when I fight or train, I like to make a mental note anytime I feel my opponent and I are pushing against each other. It doesn’t always mean it’s time for the tug-of-war trick, but chances are, if you are in a force-on-force scenario, there is probably something more productive you could be doing instead of just pushing back.
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Jason Thalken (Fight Like a Physicist: The Incredible Science Behind Martial Arts (Martial Science))