Karpova: This game was played by Correspondence from 22 February 1856 to 9 February 1857.
Athenaeum Committee (Phildelphia): H P Montgomery, P P Randolph, W G Thomas, L Elkin, A E Dougherty and Dr. S Lewis.
On 12...f5, the annotator notes that that it weakens the e-♙. 12...Ba6 looks fine.
I wonder why they didn't play 22...h6 first (23.Nh3 e4).
Perhaps 24.e5 was stronger than 24.Nh3.
26.Ng5: <Made with their eyes wide open.> 26.Nf4 appears to be fine.
27.Qc3: <With this they thought to clinch the matter, but the next move undeceived them.>
27...Qxg2+: <A beautiful finish and one that came like a thunderbolt on the New York Committee.>
After 41.Rb8, Philadelphia announced mate in six.
Source: G C Reichhelm & W P Shipley, Chess in Philadelphia, 1898, p. 61