Theme: Checkerboard pattern
Author/Opus: This is the 18th puzzle from our contributing puzzlemaster Prasanna Seshadri.
Answer String: Enter the length in cells of each of the shaded segments from left to right for the marked rows, starting at the top. Separate each row’s entry with a comma.
Time Standards (highlight to view): Grandmaster = 1:10, Master = 1:40, Expert = 3:20