INFORMAL LETTER (FCE)

Hi Ethan,

I'm glad you're (also) interested in sports. I've played several games, both indoor and outdoor games, and still try to play whenever I get time.
Volleyball was my favourite sport when I was very young. I used to play basketball, volleyball, and tennis when I was in high school. I'm not a fan of watching any sports on TV. It makes me bored and I believe is a waste of time.
Among those games, I enjoyed playing chess more than any others. Chess is an indoor game where two players participate.
It's not a physical game where someone would only use the physical movements strength but rather the game requires a perfect game plan(strategy), finding weaknesses of the opponent and a battle strategy.
This game gives you a feeling of being the King of a regime where you decide your country men's fate(the fate of your countrymen). For all those reasons this is a very interesting and enjoyable game to for me.(For these reasons, I find this game very interesting and enjoyable.)
It would be great if you could come over one day and we could fix up a meeting and play together.

Anyway, I must go and get on with my work! Looking forward to hearing from you soon.
All the best,
Niki

Good Nicola, understandable. Mostly I have made suggestions rather than corrections.

"Among those games" is fine if you has previously mentioned chess.

"favourite" is the British spelling.