(This is today's bit of advice from the book Safety Toolbox.)
Once in a while, you have a competitor who attempts to dominate the game by force of personality. Such a person is looking for some way to demonstrate his personal superiority.
He is usually outwardly aggressive by nature and preference. Against a smaller player, he crowds into his personal space. He may also be a braggart, amateur shark, and general nuisance. Personality-wise, it is surprising that he has friends.
On meeting for the first time, he runs a couple of tests to determine if you can be a victim. He uses various tactics to see if he can get you to back down. If you do so out of politeness, he mistakes this as a weakness.
For the most part, such a person is easily handled. When he makes attempts to see if you back down, hold your position. You don't have to give up courtesy, but you also don't have to give up your personal space either. If he becomes too obvious, push back enough so that he knows you don't allow cheap tricks.
Generally, if he feels that he cannot dominate you, his competitive skills decrease. He is susceptible to denial of opportunities. Create a series of innings where he only gets to shoot once and then sit down. It pays with dividends of frustration. This is the type of person that you want to apply serious psychological warfare tactics.
When you have beaten him in several competitions, he usually tries to stay away from you. If he does avoid your company, your life will be simpler.