I asked Rozentalis to explain how he devised this conception and it's very instructive to hear his account: "... Playing 29.Qa3, I had in my mind...
"я, например, идею размена ферзей на a3 видел только трижды - у Каспарова, Разуваева и Рубинштейна. Приём отнюдь не рядовой. (Adelante, 150)"...