Learn How to Underpromotion: Decisive Material Gain
This chess endgame puzzle is a classic example of underpromotion turning a promotion into a tactical refutation. Instead of automatically choosing a queen, the promoted piece must be selected for maximum force, because the position contains a hidden fork and a hanging piece that can be won immediately. In classical chess, these moments often decide the game on the spot: the new piece appears with check, gains tempo, and creates a decisive material swing rather than a slow positional edge.