On Apr 8, 7:39 pm, Jud McCranie
wrote:
On 04 Apr 2007 12:51:52 +0100 (BST), David Richerby

wrote:
Not to be picky but I suspect that whether `they' replaced perpetual
check between 1954 and 1970 depends on who `they' a the USCF and
FIDE often have significantly different opinions about details such as
these.

Thanks. The 1970 edition of the book by Harkness mentions that
perpetual check is not a rule, in a kind of vague way that makes me
think that he had more to say about it in an earlier edition.
--
Replace you know what by j to email

I looked in the "The Offical Blue Book and Encyclopedia of Chess"
copyright 1956. Page 51 states the old rule covering draw by perpetual
check has been abandoned. A player who can subject his opponent's King
to an endless series of checks can force a third repetition of the
position and claim the draw.
I was wrong on this one.
Terry