Mrs Sidney proved to be elusive in BMD records as regards her forenames and d.o.b. She seems have been born Eliza Truelove in Newdigate in Surrey on 23 July 1858, the daughter of an agricultural labourer, William Truelove and Hannah (who died when Eliza was young). (Having researched many chess players of her era, she is one of very few who came from such a humble background.) She later assumed a first/middle name of Helen or Ellen, giving her original name variously as Eliza, Elise or Elizabeth, and varying her d.o.b. by a few years. (In chess references she can be Mrs E H Sidney or Mrs H E Sidney.) She married a much older man, Paul Sidney (1830-1914), in Brighton in 1883. He was referred to as an architect in census returns and it appears that he worked as a property developer in the Brighton and Hove area, with Mrs Sidney assisting in that work. Paul Sidney left £2,212 in his will.
Mrs Sidney died (name given as Helen Eliza Sidney) on 9 December 1939 in Hove, Sussex. She left a total of £33,144 in her will.
I came upon a short biography of her in the Lady's Pictorial of 10 August 1895 and thought it would be useful to record it here for future reference.
Lady's Pictorial, 10 August 1895 (presumably written by Miriam Gunsberg who conducted the chess column in this paper. The photo above also appeared with the article)A lady who has beaten Mr. Lasker surely deserves a place in our gallery of Chess celebrities. Mrs. Sidney, whose photo we gave has accomplished that brilliant feat, and as far as we know she is the only lady that has ever won a game of Mr. Lasker. Mrs. Sidney gained her victory, as a matter of course, not in single combat, but as one of twenty-five players opposed to Mr. Lasker at the Brighton Chess Club.
The home of Mrs. Sidney is Brighton, she is a member of the St. Ann's Club and of the Sussex Chess Association, and also of the Brighton Chess Club. Mrs. Sidney has played in many matches with invariable success. Unlike most of our other Chess devotees, she only began to play Chess after her marriage [in 1883], her husband offering to teach her. The first two games did not impress her favourably with Chess as a pastime. She thought it an exceedingly slow recreation; and when her husband admonished her to take time over her moves, and think well before she touched a piece, Mrs. Sidney swept the pieces off the table and said, "No more chess for me, it requires too much thinking." But after a while she not only took to the game but determined to thoroughly master its difficulties and rapidly succeeded in her task. She is now one of the best players in Brighton, and her house is a pleasant rendezvous for lady Chess devotees sojourning at the Queen of Watering Places.
As regards the simul win against Lasker, this occurred on 3 October 1894 when Lasker won 21 games, drew three and lost to Mrs Sidney and Mr W Walker. The score of the latter's win is extant but not Mrs Sidney's.
MRS SIDNEY GOES TO COURT: SHE WHO DARES, LOSES
Mrs Sidney's name appeared in newspapers on at least three occasions in connection with court cases. One was for breach of contract (in connection with money allegedly owed to a workman) and another for slander, but she defended these two suits successfully. However, she lost a second slander suit, reported in the Daily Chronicle, 20 July 1926, and was removed from the court when she dared to interrupt the Lord Chief Justice...Online references to Mrs Sidney:
'BatGirl' of Chess.com wrote an article entitled Houlding, Herring and Sidney, with interesting details about Mrs Sidney's performance in Sussex Championships.Wikicommons has a photo of Mrs Sidney at the time of the 1897 Ladies' International. (I have colourised it as shown above)