Alexander Beliavsky (Black) Puzzle: Promote — Pawn Race

Pawn promotion becomes a tactical weapon when both sides have advanced passed pawns. In this chess endgame, White must not simply rush the pawn forward: Black’s own passer is one step from queening and attacks a loose piece. The winning idea is to gain time with forcing play against the exposed king, then advance the outside passed pawn under favorable circumstances. Checks are especially valuable because they deny the opponent a free tempo in the promotion race.