Blackmar Diemer Gambit Declined Elbert Countergambit Puzzle (Rated 1415): Interfere — Crushing Middlegame Tactics
This puzzle is a classic interference idea in the middlegame: one active rook can step into the opponent’s coordination and force a tactical collapse. Black’s pieces are harmonized against White’s king and loose central pieces, so the key is to create a direct threat that also blocks defensive resources. The position rewards seeing how a forcing move can attack multiple targets at once while keeping White’s pieces tied down and unable to coordinate.