And, of course, Jackie has shown, by negative example, the perils of using the entire
string involved in the url. You don't need the entire string when making a link to an
old post or thread just the part up to that "Number=nnnnnn" is enough. Posting the
entire string will make the screen go wide on many browsers.

Thus:

http://wordsmith.org/board/showflat.pl?Cat=&Board=words&Number=150513

is sufficient.