Harvard mathematician solves 150-year-old chess problem

You know the problem: can you place eight queens on a chessboard so that now two queens threaten each other. There are 92 distinct ways of doing this. But how about on larger chessboards? For 27×27 board people have worked out that there are exactly 234,907,967,154,122,528 ways. Now a Harward mathematician Michael Simkin has come up with an almost-definitive answer for any number queens on a corresponding chessboard. Warning: his result can lead to dizziness and fainting spells.

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