English Opening Unpinning Chess Puzzles

English Opening Unpinning is the idea of removing a pin that appears in English Opening structures, most often after White develops with c4, Nc3, and Bg2 while Black pins a knight with ...Bb4 or ...Bg4. The defining feature is a pinned piece being released by a move like a3, Bd2, Qc2, or e3, so the side to move can regain normal piece activity.