After 21...Ke7? White plays 22. Ra1! with Ra7 to follow and Black is behind in development with weak d6 pawn and useless extra piece.
Lasker - Rubinstein, 1923, Ostrau

Thank you kindly for responding, but wouldn't Black just play 22...Qxb5, winning the queen? So maybe 21...Ke7 22.Qxd7 Kxd7 23.Ra1 and then 24.Ra7... but... if say 23... ohhh, I see, Black definitely loses a piece, because if 23...Be7 to have the rook now protecting the light squared bishop, 24.Ra2+ forces the Black king back onto the 8th rank, where the rook now captures the bishop! Doing anything else just loses the light squared bishop immediately!
I may be making minor mistakes in explaining but I'm so sure it's correct!
Whoo!
Thank you so much for responding!
(PS - I know you didn't miss the queen capture, I'm not stupid, but it helped me work it out in my head...)
Hello all, and thank you for reading.

I am posting this in the general forum because I was not sure where else it should go. Yes, there is an analysis forum, but that seems to be for posting games you played and need help with; it also seems to entire game analysis.
I simply have one question about this game, and it is based on the position pictured. It is White to move.
The rest of the moves of this game goes as follows: 18.Qb8+ Qd8 19.Qb5+ Qd7 20.Qb8+ Qd8 21.Qb5+ Qd7 22.Qb8+ Qd8 23.Qb5+ and the game was drawn via perpetual check.
Now, to me, and pardon if I am missing anything obvious, it seems Black has the better position, also having a material advantage... Obviously with White going after the perpetual check this would seem to be so. What I'm wondering though is why Black allowed the draw? Could he not have played, say, 21...Kf7 and denied the draw without fatally damaging his own position? I see no reason why not, but then again, I am very tired and obviously am not anywhere near as strong as the former World Champion and could-have-been World Champion, so I am deferring to you guys and gals. My best guess is this is the dreaded 'Grandmaster draw', and that a draw would've been satisfactory for each man in the tournament they were currently playing in.
Again, thanks for reading!