Without using Stockfish, how does one do this in their head? What rubric can you use to evaluate whether one square is better than another? (I’m a very low level player, obviously,)
Bishops like long diagonals, and to complement the pawns' attacking squares (Ps & Bs tend to cover only one color). Also good for "countering" a knight 3 squares away (Nf6 & Bf3, for example, though it seems to prefer Bg2).
Rooks like open files, doubling up, 7th rank plays, and (in this case) the rare opportunity to line it up w/ their king (Rg3).
Queens like not being trapped or sidelined (by either side's pieces), good diagonals, good files, or both (like some natural mix of rook & bishop wants).