The Six Pawns
In how many different ways may I place six pawns on the chessboard so that there shall be an even number of unoccupied squares in every row and every column? We are not here considering the diagonals at all, and every different six squares occupied makes a different solution, so we have not to exclude reversals or reflections.
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H. E. Dudeney, Amusements in Mathematics (1917) · No. 358
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