Chessical: Oscar Chajes plays very ambitiously and with imagination against Nimzowitsch, but at a critical juncture he is tactically outplayed. Chajes was a strong natural player who once defeated Capablanca - O Chajes vs Capablanca, 1916
M Basman vs M Cebalo, 1966 to move 15 (13...Qe6 14.Rd1 0-0 15.Rd6 Qf5) is actually a recommendation of Schelecter's to improve Chajes' play.
<14.f3> is a precise and clever move by Nimzowitsch, it seems that Chajes was hoping for the complications of: <14.fxe3> Qe4 15.0-0-0 Bf5 16.Bb5+ Nc6 17.Qa4 Qxe3+ 18.Rd2 0-0 with a complex position with plenty of play for both sides.
Chajes cannot castle safely, if <15...0-0?> 16.Rd6 Qf5 17.Bd3
<16...Qg6!> is an excellent move and Chajes' best chance. Winning the exchange puts a great defensive strain on his position, but he should have been able to hold on. It seems that Nimzowitsch was simply too strong tactically for him.
Nimzowitsch would only have had a draw after <17.g4> Qh6 18.Bxf5 Qh4+ 19.Ke2 Qf2+ 20.Kd3 Bb5+ 21.Ke4 Bc6+ 22.Kd3 Bb5+ (= by repetition). In this line, <22...Qxf3?!> loses to 23.Kc2 Qf2+ 24.Kb1 e2 25.Qd6
<19...Nxf1> is less accurate than Chajes' move: <20.e6!> Qxe6 21.Bxf1 Qb6+ 22.Bd4 with advantage
<24...Rd8> (better 24...Rc8) and 25....h5 (25...h6!) lose to Nimzowitsch's <26.Bd3!>
Nimzowitsch's <30.Qg6+> is rather cruel considering he only had to play <30.Qxg7>.