Nice wrap up!
Maybe adding the links to the users profile would be helpful.
I wanted to check exactly what was what and had to search for them by myself

Edit:
You might want to correct this:
Score= a - 2^b (2 to the power unique negative)
= 2 - 1 = 1
Since the score is greater than or is equal to 0,
=> the score is greater than
or is equal to 0,
Edit2:
Also you have a "Method 1", but not Method 2, or 3
