Nate Dray, Chess Problem Painting, "Sam Lloyd, 1897 - Orange moves first, mates in two"

"Sam Lloyd, 1897 - Orange moves first, mates in two"

The chess problem.

Typically, in a chess problem presentation, White moves first and achieves mate in a specified number of moves.

Here Orange takes the place of White and moves first. 

The key move Orange must first make is seemingly innocuous.