|White to move and promote his pawn first|
The rules were simple: White to move. Whichever side could promote a pawn first would win the challenge.
At first glance it looks easy: White has the first move, so obviously he can advance his queenside pawn majority to create a passed pawn first. But once you factor in the possible responses by Black you will realize that it isn't that straightforward! There are many endgame concepts to take into account, such as pawn majority, tempo, pawn freeze, and others.
Hence, I am leaving this puzzle as a challenge for y'all to work on. You are free to speculate on the moves and possible replies in the comments section, and I will go through the solutions next week.