How to return rows that have the same column values in MySql

Question

Lets consider the following table-

ID Score
1  95

2  100

3  88

4  100

5  73

I am a total SQL noob but how do I return the Scores featur

Answer 1

select Score
from tbl a
where a.ID = 2 -- based off Score with ID = 2
    --include Score only if it exists with ID 6 also
    and exists (
        select 1
        from tbl b
        where b.Score = a.Score and b.ID = 6
    )
    -- optional?  ignore Score that exists with other ids as well
    and not exists (
        select 1
        from tbl c
        where c.Score = a.Score and c.ID not in (2, 6)
    )