Emanuel Lasker (White) Puzzle: Mate — Pawn Promotion

This chess endgame is decided by the speed and purpose of passed pawns. Both sides are one step from creating a new queen, but promotion alone is not the whole story. White’s advanced pawn promotes with tempo in a way that turns the exposed black king into the real target. The key tactical lesson is to calculate the complete race, including the checks available immediately after each side promotes.