Nice Intermezzo/Zwischenzug

White has just played 1. Rxb6 [pawn]:

White is relying on 1. ... Nxd5  2. Rxa6 or 1. ... Rxb6  2. Nxb6 Rb8  3. Rb2 and then 4. Na4, breaking the pin and defending the Rook.  But Black does not comply but instead plays the beautiful intermezzo/Zwischenzug [in-between move] 1. ... g4+, forcing White to withdraw to the 2nd rank where Black can check with the Rook, escape the White Rook's attack, and then pick up the now-hanging Knight.

This is from a recent game of mine where I was White [unfortunately].  Nice play by my opponent hilariocusme.