  The first three lines of this file were inserted by  . They record metadata
;; about the language level of this file in a form that our tools can easily process.
#reader(lib "htdp-intermediate-lambda-reader.ss" "lang")((modname ex478) (read-case-sensitive #t) (teachpacks ()) (htdp-settings #(#t constructor repeating-decimal #f #t none #f () #f)))

  Q - You can also place the first queen in all squares of the top - most row ,
;;     the right-most column, and the bottom-most row. Explain why all of these
      solutions are just like the three scenarios depicted in figure 173 .

  A - For n = 3 with a queen placed at any position on the board , there will
      be a square 2 steps in the vertical or horizontal direction , then 1 step
      in the corresponding other direction , which the first queen does not
      threaten . This generalization holds for the three scenarios depicted in
      figure 173 . Notice how each queen is on a square an L - shaped pattern away .


  Q - This leaves the central square . Is it possible to place even a second queen
      after you place one on the central square of a 3 by 3 board ?

  A - No . A queen in the central square threatens every other square on an n = 3
;;     board. The generalization earlier also holds here. Notice how it isn't
      possible to move place a second queen two squares away from a queen in the
;;     central position.

 about the language level of this file in a form that our tools can easily process.
     the right-most column, and the bottom-most row. Explain why all of these
     board. The generalization earlier also holds here. Notice how it isn't
     central position.
  The first three lines of this file were inserted by  . They record metadata
#reader(lib "htdp-intermediate-lambda-reader.ss" "lang")((modname ex478) (read-case-sensitive #t) (teachpacks ()) (htdp-settings #(#t constructor repeating-decimal #f #t none #f () #f)))

  Q - You can also place the first queen in all squares of the top - most row ,
      solutions are just like the three scenarios depicted in figure 173 .

  A - For n = 3 with a queen placed at any position on the board , there will
      be a square 2 steps in the vertical or horizontal direction , then 1 step
      in the corresponding other direction , which the first queen does not
      threaten . This generalization holds for the three scenarios depicted in
      figure 173 . Notice how each queen is on a square an L - shaped pattern away .


  Q - This leaves the central square . Is it possible to place even a second queen
      after you place one on the central square of a 3 by 3 board ?

  A - No . A queen in the central square threatens every other square on an n = 3
      possible to move place a second queen two squares away from a queen in the
