I do agree some questions are not straight forward and it comes to how we understand the question. I had the same doubt but whichever i choose as the corner, the answer to the puzzle was still 15...you either start at 2 or at 3 based on what you consider as the corner.
I understood the running race puzzle in a different way and assumed that my solution was correct. But @ksolymosi said that the clues were to be understood differently.
End of the day, these daily brain games give a good workout to my brain and any rewards I get along is an added bonus. So, lets enjoy and solve more puzzles. :-)
RE: Daily Brain Games 59 - how witty are you?