birthtimes: Lasker writes, "Black has not played the opening to the best advantage, and his last move [8...Bd6] is weak. White threatened to cut off the retreat of the g4 bishop by Ng3; hence, Bh5 was here the reply."
10...Bxg3 "should lose. The lesser evil was 10...Bh5."
After 11. hxg4, "The rook file being open, g5-g6 is threatening."
After 16...g6 "Black, in his three pawns plus, has a material equivalent for the White bishop, but White has an enormous start in development.
Therefore, White had to attack. Where? On the queenside, where White is clearly superior; by no means on the kingside, where the Black pawns have it all their own way.
The target for the attack...is c6. After 17. b4 White threatened immediately b5. If 17...a6 18. a4 whereupon b5 cannot be prevented, the Black queenside pawns are sure to be weakened and the supremacy of the White pieces decides the fight long before the Black pawns can get into action.
White adopted this plan only after losing much valuable time; he lost his superiority in development, and the game was eventually drawn."
Lasker's Manual of Chess, 1960, pp. 284-285.