Using ten continuous lines, and not lifting your pencil from the paper, go through all the dots of a 6x6...

geometry/ten.lines.6x6 New, unsolved

New entry, edited from material collected for the archive and not yet in a released version.

Problem

Using ten continuous lines, and not lifting your pencil from the paper,
go through all the dots of a 6x6 grid, ending at the same place you
started.  Do not visit any dot twice in your path.

-- Ed Pegg Jr. <xeipon@ix.netcom.com> (npl-folk mailing list, July 1999)

Show solution

No solution was found in the collected postings.

The answer (and several similar problems) is at www.mathpuzzle.com.
The solution (by Michael Cysouw of the Netherlands) is quite nice.  I
haven't seen it before, so perhaps it's original.  The 7x7 and 8x8
solutions are by H E Dudeney and Sam Loyd.

-- Ed Pegg Jr. <xeipon@ix.netcom.com>