8.O-OWhite plays the variation which Dr. Tarrasch recommends to Black in case White moves 6) P - Q R 3 instead of 6) B - Q 3. White has therefore, compared to this line of play, the advantage of a move.
11.Be2But now, curiously, White forgets the point of that strategy, which is to capture first the Kt P. After 11) P x Kt P, P x Kt P; 12) R x R, B x R, the advance Q Kt 5 would no more be a menace.
12…Na5The Q Kt P and Q B P are thoroughly secured; the Kt threatens to go to Q Kt 6 and P - K 4 is prevented. Black has therefore an undoubted advantage.
15.b3If he wants to drive away the Bishop by P - K B 3 and P - K 4, he must concede the exchange of the Kt on K 5. If the Kt on K 5 is exchanged, the Pawn Q B 5 is out of all danger.
17.f3A mistake. In order to secure the Kt on B 4 he should exchange the Kt on R 4 and afterwards place the Kt from K 5 on Q B 4.
Emanuel Lasker, The International Chess Congress, St. Petersburg, 1909 (1910) · Public domain · source