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 Improved solution by Tristan)

Edited on November 26, 2005, 6:13 am

Posted by pcbouhid on 2005-11-26 06:12:09