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No: 06       October 06, 2021


NO FOUR IN LINE

NO FOUR IN LINE

What is the maximum number of queens that can be placed on a standard chessboard so that there will be no more than three queens in a row, a column or a diagonal line?

If the problem was asked for a 4x4 chessboard and for two queens the answer would be 8.
(Diagonal lines are shown in blue.)

example

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