if you counted...
9-15 you are an average person who is not that great at chess
16 you either a average chess player or a non chess player who has a good perseption of the (board?)
17+ you're hallusinating or your drunk
I don't think it works like that :p
9 and maybe 10 are the only other reasonable answers besides 16 I think... well maybe 15 as one poster showed he didn't see the 3x3.
For example if you answered something like 13 it means you understood the task, but were too lazy to do it right.
Not necessarily, if you allow the possibility of quantum effects.