Oh, I know!
It is... a troll forum :(
FREE DIAMOND MEMBERSHIP FOR WHO GETS THIS RIGHT!

What is "1" and "+"? Are we wrong to assume this is addition within a ring? If this is just an abelian group, and "1" is the identity, then this is confusing notation. Please clarify.
I already answered it: it is a Pawn move (like e2-e4 or c7-c5)
Next to the famous: 9