It looks like this club has changed. I received this message when I
tried to access it just now...

>Yahoo! Groups

>Congratulations, your Club has been migrated to Yahoo! Groups where
you have lots of new features:

>Post / receive messages via email
>Advanced membership management features
>Search messages in group by keyword
>Privacy of Clubs preserved
>And much, much more!

>The old web address for your club
http://clubs.yahoo.com/clubs/chesshistory has been changed to
http://groups.yahoo.com/group/chesshistory. (Don't worry, if you
enter the old address, we will display the new address for you.)

>For more information, view our Welcome Page for Yahoo! Clubs users.

...As the message says, the old & new addresses are:-
OLD: http://clubs.yahoo.com/clubs/chesshistory
NEW: http://groups.yahoo.com/group/chesshistory

I have another site on 'Yahoo! Groups' with this address...

CHW: http://groups.yahoo.com/group/Chess_History/

...which I use to send out the 'Chess History on the Web' articles.
This is definitely going to confuse people! I'll see what I can do to
merge the two. - Mark