Problem 54770. Count the peaceful queens

In a 5x5 chessboard with a queen of one color (white, say) on the perimeter, one can place 12 black queens on the board such that none of the black queens can attack the white one (or vice versa).
Write a function that returns the number of queens that cannot attack a queen of the other color placed anywhere on the perimeter of an nxn chessboard.
Solve

Solution Stats

64.75% Correct | 35.25% Incorrect
Last Solution submitted on Nov 26, 2025

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chess oblong sequence

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