Learn How to Spot Triangle Mate: Mate in 3
This chess endgame puzzle is really a forcing middlegame tactic in disguise: White uses active pieces to attack the enemy king while the black queen and rooks are overloaded. The key idea is a discovered attack that also clears lines for a mating net. Once the defender is forced to move, the remaining pieces coordinate to create a triangle mate pattern, where the king is boxed in by checks from different directions and has no safe escape square.