Underpromotion Milestones (opens in new tab)

Recently, the famous Babson task (Black promotes to one of the four possible pieces and White must promote to the same piece in all four cases to win) has been conquered by in an endgame study. Many thought it to be impossible to realize this extremely difficult task. In this second part of the three part series Harold van der Heijden describes how study composers progressed towards solving the problem.