Another answer key could perhaps be the number of tents in both diagonals.

In this case, it would be (1,0)

Edited by rakesh_rai 2011-07-05 7:39 PM

Rohan mentioned that 'describing diagonals won't work. I'm not sure what he meant, but I think he was trying to say that the diagonals will/may be solved early.
In that case #of tents in both diagonals won't work too.