1. I don't have VTC privilege on this site yet,
but, if I did, I would be inclined
to leave [It is related to a type of mathematics game][1] closed
because it is a mathematics problem and not a mathematics puzzle. 
A question shouldn't be reopened
just because the *original* close reason has been resolved;
it should be reopened only if it is worthy to be open.
2. Maybe this is an incorrect way of thinking, but:
The question appears to have a unique solution (answer),
and it has gotten that answer (twice). 
It's not clear what purpose is served by opening the question to new answers.

[1]: http://puzzling.stackexchange.com/questions/40904