In a chess board, the queen piece can move horizontally, vertically and diagonally freely. The picture represents.......

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In a chess board, the queen piece can move horizontally, vertically and diagonally freely. The picture represents the same.
Can you place 8 queens on the board in a manner that none of the queens can attack each other?

Imagine there are infinite number of Queens (Chess Game Piece) with u. Find the minimum number of queens required so that every square grid on the chess board is under the attack of a queen. Arrange this minimum no. of Queens on a chess board.

Fill in the matrix, in such a way that the sum of the numbers in each row (horizontally, vertically, and diagonally) is 264, even if you hold the matrix upside down. You are only allowed to use the digits 1, 6, 8, and 9, and each number may appear only once in the matrix.