The ability to promote is often the critical factor in endgames and therefore is an important consideration in opening and middlegame strategy. Almost all promotions occur in the endgame, but promotion in the middlegame does happen.
International Master Cecil Purdy said "Pawn endings are to chess as putting is to golf."
In king and pawn endings, an extra pawn is decisive in more than 90 percent of the cases
Diagram - Black to capture the bishop on a2 ? Play
😎 Video - Advanced chess endgame (7:59)