Ruy Lopez Steinitz Defense Mate In 1 Beginner Puzzle (Rated 1039): Spot Mate in 1 — Mating Net

This middlegame puzzle is a classic example of a mating net: the attacking side has coordinated pieces aimed at the enemy king, and one forcing move ends the game immediately. Even though material may be uneven, king safety overrides everything when the defender’s escape squares are covered. In classical chess, these patterns often appear after a trigger move creates a direct line to the king and leaves a key square undefended.