Kangaroo Defense Keres Defense (1.d4 e6 2.c4 Bb4+ 3.Nc3) Chess Puzzles

“Kangaroo Defense Keres Defense” is an opening-class label for a specific Kangaroo-style defensive setup where Black aims to meet central pressure with flexible piece play and a Keres-inspired defensive arrangement. The defining feature is the Kangaroo concept itself—Black’s pieces are developed to support a later central break or to blunt White’s center—while the “Keres” part signals a particular defensive move order/structure that isn’t consistently documented in public sources. Because this is an opening-family topic page, I can’t reliably name the exact move sequence that uniquely distingu