Vlastimil Hort (White) Puzzle: Checkmate — Mating Net

A mating net succeeds when active pieces restrict every escape square around an exposed king. In this middlegame position, White’s advanced knight and centralized bishop exert decisive pressure over the black king’s shelter, while Black’s own rook and pawns limit its mobility. The attacking rook can then join the attack on an open rank, delivering a protected check that cannot be captured, blocked, or escaped. This is a pure king-safety tactic rather than a chess endgame calculation.