Competing in a PK is the best way to solve problems. I prefer using the 9-key grid for typing, while my wife likes the 26-key layout. To prove that the input method is for older people, we held a competition to see who could type faster within a set time. In just one minute, we determined the winner. This made me think about how I often see various online disputes that could actually be resolved through PK competitions. We could have two people compete in trading, determining the winner within a specified time. This way, the organizers can also gain traffic, and the participants can quickly determine the outcome.