Richard Reti (Black) Puzzle: Draw — Rook Endgame

This chess endgame is a precise defensive study: White’s advanced passed pawn is close to promotion, but Black’s extra rook controls the promotion file and cuts off the king. The position is theoretically drawn, yet only accurate play preserves the result. White must advance the pawn while using the king and rook to create checking opportunities. The key strategic idea is activity: checks from behind or beside the enemy king can force repetition, disrupt coordination, and prevent the extra rook from stopping promotion cleanly.