optimal play: The ninth game played on 4th February 1875 in a match for the first to five wins (draws not counting).
Going into this game, Goldsmith led Fisher by 4 wins to 3 and thus only needed one more win for the match.
5.Qe2 previously only played by Wilhelm Steinitz
5...Bf5 Novelty in 1875
30.Rd6? was a missed opportunity by Fisher. 30.Rb4! is much better because if 30...Rb8 then 31.Rd6 Rb7 32.Ke2 Rd7 33.Rxc6+ Kb7 34.Rxb6+ axb6 35.Nc5+ Kc8 36.Nxd7 Kxd7 37.Rxb6 and white has a winning position.
Match score at the end of game 9 :-
0-0-1-1-0-0-1-½-½ (4/9) [+3 =2 -4] Fisher
1-1-0-0-1-1-0-½-½ (5/9) [+4 =2 -3] Goldsmith
And Goldsmith still only needs one more win to take the match.