title: Simple algorithm to move from one tile to another using only a chess knight's moves
body: <p>I have a problem shown below that wants to find the quickest way to get between any two points by using only the moves of a knight in chess. My first thought was to us the <code>A*</code> algorithm or <code>Dijkstra's</code> algorithm however, <strong>I don't know how to make sure only the moves of a knight are used.</strong> I would appreciate it if you could suggest a better algorithm or just some tips to help me. Thank you.</p>
  
  <blockquote>
    <p>Write a function called answer(src, dest) which takes in two parameters: the source square, on which you start, and the destination square, which is where you need to land to solve the puzzle.  The function should return an integer representing the smallest number of moves it will take for you to travel from the source square to the destination square using a chess knight's moves (that is, two squares in any direction immediately followed by one square perpendicular to that direction, or vice versa, in an "L" shape).  Both the source and destination squares will be an integer between 0 and 63, inclusive, and are numbered like the example chessboard below:</p>
  </blockquote>
  
  <pre>
  -------------------------
  | 0| 1| 2| 3| 4| 5| 6| 7|
  -------------------------
  | 8| 9|10|11|12|13|14|15|
  -------------------------
  |16|17|18|19|20|21|22|23|
  -------------------------
  |24|25|26|27|28|29|30|31|
  -------------------------
  |32|33|34|35|36|37|38|39|
  -------------------------
  |40|41|42|43|44|45|46|47|
  -------------------------
  |48|49|50|51|52|53|54|55|
  -------------------------
  |56|57|58|59|60|61|62|63|
  -------------------------
  </pre>