We consider a modified $6-$Queens problem. The chessboard is with $66$ squares with two black ones. Each black one can block any attach if it is between two queen either

horizontally, vertically, or diagonally. Please use backtracking approach to place the $6$ queens so that no any pair attach each other. You only need to provide two solutions for

the $6$ aueen blacement $($use Q for a queen in the chessboard$).$