Blackmar Diemer Gambit Vienna Variation Puzzle (Rated 1225): Win Material — Tactical Refutation

This middlegame puzzle shows a classic tactical refutation where active piece placement outweighs raw material count. The key idea is to notice overloaded defenders and loose pieces on the board, especially when a rook or bishop can invade an exposed rank or file. In positions like this, a forcing sequence can convert activity into a decisive material gain, even if the opponent appears to have the better structure or extra piece coordination.