1K ZX Chess is a single-player action, strategy, and tactical game in which players engage in a chess match against a computer opponent, utilizing simplified yet comprehensive chess mechanics. In this game, set on the Sinclair ZX81 platform, players experience a minimalist chess environment where the game code occupies only 672 bytes, making it the smallest chess implementation of its time, with rules excluding castling, promotion, and en passant. It stands out with its educational theme, offering players a chance to learn and practice chess strategies within a constrained technological framework, featuring an AI opponent that challenges players to think critically and adapt their tactics.