| Bridgeburner: I believe Rubinstein missed a golden opportunity to counter attack via the Black squares on the Queen side at move 20 and so ends up drifting into a poor position. Instead of 20.Nc3, he could have tried 20.Qd2! This move protects e3, and threatens 21.Ba3 (and eventually Bd6). For example:
20.Qd2 Qe7 (preventing Ba3) 21.Qa5 h4 22.h3 b6 23.Qa6 Nh6 24.Ba3 Qd8 25.Bd6. 
click for larger viewThis powerful black square incursion stops Black's attack in its tracks and takes the initiative. This passivity seems to be a fairly typical weakness of the early Rubinstein before he hit his straps a few years later. Nevertheless, Rubinstein defends well by building up a fortress which his opponent breaches by returning the exchange on move 53. Instead of taking the initiative and equalising with 55.Rxc6, Rubinstein stays on the defensive because of a morbid fear of Black's Rook eating the rear of his pawn chain. 55.Rxc6 Bd7 56.Rb6 Rxe3 57.d5 Re1+ 58.Kd2 Rh1 59.Rb8+ Kf7 60.dxe6+ Bxe6 61.Rb7+ Kg8 62.Nxe6 Rxh2+ 63.Ke3 Rg2 64.Kf4 draws | 
sac: 53...Rxa3
