(Note: I am assuming that this is a cover letter to a company, that is, a letter that accompanies a CV (resume) and expresses an interest in a job at the company)

Hello. My name is Marina. I’ll be happy to get the job in your company and work hard to get results in this position.  

I am interested in applying for the position of (name the position) at (name of company). I have developed excellent analytical and leadership skills through my experience as the executive assistant in a shipping company, as well as excellent communication skills as a sales manager. My dedication and gumption is highlighted by my achievement as a chess master. I am now looking to further develop and use my skills in a new remote position.

notes;
Do not put your name in the body of the letter.  It will be at the bottom of the letter and on your CV.

gumption is not a word you would use here -- not sure what you mean.

Your information about being a chess master would not be included in the letter, unless it is directed related to the position you are interested in.