6.c4This move of development involves loss of time and allows Black to bring his pieces into play more rapidly than White.
9.Nxc6White exchanges here, probably thinking that his Knight, which can no longer go to K B 5, is of less value than Black's Knight, which has far more scope.
12.f3Again loss of time, which might have been avoided by 12) B x B. He would, in this case, have been able, after 12) ..., P x B; 13) B - K Kt 5, P - R 3, to gain time for the important developing moves Q - Q 2 and B - Q 4.
18…a5To render the Knight at B 4 safe from attack by White's Knight's Pawn, P - Q R 3; then, of course, P - R 5, in order to oust the Knight from his strong position. White had to lose three moves, viz., P - Q Kt 3, P - Q R 3, and P - Q Kt 4. Black has a strong and safe position.
19.Qg4White's position does not warrant such operations on the wings.
19…Nxe4By this move Black is at last enabled to gratify his desire of pushing the K B P.
23…Qf6And now it is Black, who takes possession of the important Black diagonal and of the open King's file.
28…h5A fine idea. He threatens, at an opportune moment, P - R 5 and R - K 6.
30…Kf6Now he is ready for P - R 5, as the King has taken up the most favorable position.
31.h3This facilitates Black's task, but the game was lost in any case.
Emanuel Lasker, The International Chess Congress, St. Petersburg, 1909 (1910) · Public domain · source