Vienna Game Anderssen Defense Beginner Puzzle (Rated 1003): Fork — Decisive Material Gain

This puzzle is a classic middlegame example of a fork-based tactical refutation in the Vienna Game. Black’s active knight jump creates a forcing sequence that wins material by attacking multiple high-value targets at once, while also exploiting king safety and piece coordination. The position rewards concrete calculation over general strategy: once the tactical shot lands, White’s extra material and space advantage disappear quickly. It’s a strong example of how one active piece can overturn a seemingly better position.