whites knight no longer defends e5, the time to break the pawn structure is now. he will be forced to play Nf3 if I play Bg7, giving me a single tempi.

well played by white.

White cannot respond - and yet has to.

Nxd4 is detrimental, d4 is a checking square for the rook and thus loses material.

Bf8 breaks everything - the passed pawn cannot be ignored - but giving that pawn a connected passed pawn, is incontrovertible.

all weaknesses are defended and white cant stop the b4 tactic. Bb7 and Bf8 break the pawns.