Instead of 25.h4, Fritz preferred (.37) (20 ply) 25.Rhc1 Kg8 26.Ra3, or (.36) (20 ply) 25.Rhg1 Kg8 26.Qg2, with a small edge for White.

After 25.h4, 25...g4 26.Qg2 Ne7, or 25...gxh4 26.gxh4 Qe7, the position would have been about equal.

After 25.h4 Qc8, Nimzowitsch indicated he was threatening to win a piece.

However, after 25.h4 Qc8, Fritz indicates White could have allowed Black to win the piece, and White would still have retained an equal position: 25.h4 Qc8 26.hxg5 Bg4 26.Qg2 Bxe2, (.23) (20 ply) 28.f3 Ba6 29.Kg1 h5 30.Rxh5+ Kg8, (.26) (20 ply) 31.Qd2 f6 32.Kg2 Rf7 33.Rah1, (.13) (21 ply) 33...Qd7 24.b3.

Fritz indicates that 29...f5, was not the winning move. Only after 30.fxg4?? fxe4, was White's game lost.

After 29...f5, Fritz indicates Schlechter could have defended with 30.Ng1! f4 31.gxf4. If then, 31...Nxf4 32.fxg4 Nxd3 33.Qxd3 Qxg4 34.Qd2 Rf6 35.Nxh3 Rf3 36.Qg2 Qxg2 37.Kxg2 Rxe3 38.Ng5+, and the position is equal.

Come off it:

"21.Qf3 a5 Again preventive play. This time the possibility of c4, and b4, is to be anticipated"

Really? Was b4 such a major threat? Isn't a practical point of a5 to be able to play Ba6 as an option if a later a4.

I am saying this because I am going through Nimzo games and they seem a bit low on hypermodernism in general if the games are before 1910. The most exciting tournaments of Nimzovich for me are after 1920 - "My system" published as a serious of articles in 1925. I feel that maybe also his exposure at being hammered by the likes of Capablanca and Alekhine would have also shaped his higher level concepts a bit more - maturing past 1920.

I think what has happened here is that he has retrofited some past early games when he was younger as though they had intent of concepts in My system. I think this is more about creating examples for "My system". Does this game example really demonstrate prophylaxis or prevention or just strong tactical ability of a relatively young Nimzovich. I think the latter.