Is it possible to place $4n$ non-attaking queens of in a $4n \times 4n$ chessboard??
I have found that it can be done for $4 \times 4$ chess board and trying to extend it to $8 \times 8$ chessboard and then apply induction.
I also see that we cannot place the queens in the corner position of a board!!
Will this process work?? and how please help!!