Jgamazo: Comments from Frank Marshall and Carl Schlechter from their respective books on this game:
Marshall (My Fifty Years of Chess, 1942)-Now 6...Be7 was much better, as this move later exposes Black to a strong attack by e4-e5. The text threatens 7...cxd4, compelling White to recapture with the c-pawn, but White's next move takes care of the threat.
Schlechter (Deutsche Schachzeitung, 1908))-If 8...0-0, then White can begin a sharp attack by 9.Ng5! (9...h6 10.h4!)
Schlechter-Now, by advancing with the e-pawn, White achieves an advantage. Cautious was 10...cxd4.
Schlechter-Premature would be 17.b4, because of 17...Qa3.
Marshall - As a result of the thrust with the e-pawn White has obtained two Bishops and a lasting attack. The text prepares for b2-b4, which, if played at once, could be answered by 17...Qa4.
Schlechter -Perhaps 24...Rd7 was a better defense. After the text, it seems that Black's position cannot be saved.
Marshall- 25...axb6 26.Bxc4 Qxc4 27.axb6 would only hasten the end because of the opening of the a-file.
Schlechter- Threatening 30.bxa7+ Ka8 31.axb7+ Kxb7 32.a8=Q+ Rxa8 33.Reb1+ etc.
Marshall -If 29...Nxd4 30.Qe5+! wins quickly.
Schlechter - Not 32.Bxb6 because of 32...Rd5!
Schlechter-Or 37...Re8 38.Qa3 Qa5 39.Qb2+ and White wins.