Erich Eliskases (Black) Puzzle: Skewer — Pawn Promotion
A skewer is a tactical line attack in which a more valuable target is forced to move, exposing something behind it. In this chess endgame, both sides have dangerous passed pawns close to promotion, so tempo is everything. The winning idea combines the promotion race with queen activity: after the pawns transform, checks and line attacks create a skewer that decides which newly promoted queen survives. Material is initially equal, but the tactical sequence changes that balance decisively.