Illesca's puzzle (1)

Every day, Catalan GM Miguel Illescas publish a puzzle in La Vanguardia newspaper. He indicate the difficulty ( low, intermediate, expert), the time according to solve it and a briefing.

In this case, it's a match between two danish players, Jensen and Borg, played in 1991, and the goal is to promote white pawn. I don't the solution because Illescas wrote it the day after and i don't buy the newspaper, i gave you my own solution.

Obviously, any others are welcome.