If you're question is: What job can I get if I put "strong chess player" on my CV, the answer is probably nothing. Although a difficult game to master, the skills you acquire with chess has very little resemblance to the skills prospective employers are looking for. Employers value real world experience in their domain - they are not usually too interested in abstract similarities.
On the other hand, if you're question is: I'm good at chess - what else could I be good at? I imagine any career that is founded on logic and mathematics would be a reasonable fit - perhaps computer programmer or actuarial work. But you still have to do show that you can do the job - either by getting an education or getting experience even if it means doing work in your free time.
Being a chess player is a certainly a benefit - it shows you are able to grasp complex problems and perform under pressure - but at your friend's level it is not nearly enough by itself to get any kind of job that I'm aware of.