Here’s another Troitzky composition with a valuable lesson useful for practical play. From a 1910 Deutsche Schachzeitung issue.
1.d6 Rg7 [1...Rg8 2.Rh3+ Kg7 3.Rg3+] 2.Rh3+ Kg8 3.Rg3 Rxg3 4.d7 and now you know why Troitzky put a black pawn on d4! BTW, for novices, a king and queen should beat a king and rook. Composers aren’t expected to provide the demonstration.