Eight queens puzzle
mathematical chess problem of placing eight chess queens on an 8×8 chessboard so that no two queens threaten each other
en-US/ˈeɪt ˈkwinz ˈpʌzəl/
en-GB/ˈeɪt ˈkwiːnz ˈpʌzl/
mathematical chess problem of placing eight chess queens on an 8×8 chessboard so that no two queens threaten each other