Instructions: For this month’s puzzle, please submit your answer as well as a brief explanation of how you arrived at it. The puzzle is presented below. Happy solving!

sometimes it's tough to know you've answered rightly though perfect game play will permit proof politely. when really proving it's permissible, you may critique. However do note the question's answer is unique. The fastest way to win -- that's the mystery. Proving that it's really winning demands the history. So please presume play preceding present position's approved. Last thing: best you know black just moved.