Endgame Tactics ★ Free

: A situation where every legal move available to a player weakens their position or leads to an immediate loss.

: A king maneuver (typically moving in a triangle of squares) used to lose a tempo and force the opponent into zugzwang . Endgame Tactics

Successful endgame play relies on mastering specific technical tools and mental habits: Dissecting a Frustrating Endgame - Chess.com : A situation where every legal move available