Jan Hein Donner (Black) Puzzle: Check — Perpetual

A perpetual check is a tactical drawing resource in which repeated checks prevent the enemy king from escaping or improving its position. Here, White’s queen and bishop create serious pressure around the exposed black king, while Black’s advanced passed pawn demands immediate attention. The key strategic idea is to balance attack and defense: exploit king safety before the pawn can promote, and use checks to keep the initiative when a direct material win is unavailable.