What is the minimum number of strokes to reproduce the drawing below without lifting up the pencil from the paper (no tricks at all), and without passing over a line segment (or part of it) already drawn? You may begin and end wherever you like, and line segments may cross each other, but only as intersections.

Note: a new stroke occurs when a line type ceased because you have to stop and change direction.

(In reply to re(13): No Subject | spoiler | by pcbouhid)

The note changes nothing.  It still takes 15 strokes.  One initial stroke followed by 14 new strokes.  All of them count, not just the new ones.

It seems a bit silly to argue about this.  The solution was fun to work out.  Thank you for posting the problem.

Posted by Mindy Rodriguez on 2005-11-25 14:31:55