White has a solid advantage primarily because of the open g-file and Black’s King exposure.  In addition, Black’s Queen is tied down defending the Knight on g7, which also happens to be checkmate.  However, on the flip side, White has a Knight on h3 doing nothing, a Bishop on e2 tied down to defending the Pawn on f3, and the Rook on d1 could be more useful on the g-file.  So, what’s my plan? Well, I decided that the best course of action was to improve the position of all those aforementioned pieces, and thus, increase the pressure on Black’s position.  The easiest piece to fix is the White Bishop.  Why? Well, the Black piece hindering the Bishop is the Knight on e5 and that Knight can be knocked out with 27. f4.  But, before playing a move like 27. f4, we must make sure that we aren’t helping Black out by chasing his Knight to a better square.  All the forward moves, Ng4, Nf3, Nd3, and Nc4 are protected by White’s Bishop. Don’t make the mistake thinking that the c4 square is protected, because it isn’t.  The Black Knight also cannot go toward his King to help defend with either Ng6 or Nf7.  Therefore, Black’s only real choices are either 27. ... Nc6 or 27. ... Nd7.  After the Black Knight retreats, my Bishop is free to join in the attack.  And, because the Black Queen is tied down defending the g7 square, we can get another free move attacking the Black Queen with 28. Bc4.  I refer to this tactic as the Invisible Defender.  Basically, the Bishop is protected by a stronger threat somewhere else on the board.