Array doesn't need any references and Contains is from System.Linq

Description says:
Four of the same symbols in a row wins
Why no information that 4 symbols in a diagonal is also a win?

why

What about [2, 2, 3, 4, 5, 6, 7] array?

Going to work with the tests, but if game score is bigger than 9 it is going to break.
Still a good solution.

Normal soluton: https://www.codewars.com/kata/reviews/5543abb64e405654510001d6/groups/628fa9c041bdea0001bee974

Good idea, but why not use Math.Abs(number) to remove -
Also actually there is no point in using a list here.

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Why does a 3-line solution seem less clever to people than this?

How?

using System; is useless here.

I would change these tests and add more explanations to the task description, otherwise everything is very unintuitive.

I think in this case it may turn out to be an infinite loop.
For example if the string is something like example ) example.
So it might be better to use s.Contains('(') && s.Contains(')')