Rosenthalis’ game, and every game I played in over twenty years continued with the tactical:
e5, Nfd7 8. e6, Nf6 9. ef, Kf7.
Black seems to have compensation with the only center pawns, even though he can’t castle immediately. In all these years, I only lost twice. Once was against IM Sherazi.
Well, a few weeks ago, I played a fellow 2000 player, who sat a long time after 6…d5. The game continued: 7. ed, Nd5 8.Bc4!
A very different position, but extremely logical! Keep the position open, where White has a big lead in development. I couldn’t come up with a plan to catch up in development and lost. True, I have no experience in this exact position, but neither did my opponent.
Many lessons can be made from this experience. It is all how you look at it.
I don’t know that opening, but there are a few good online sites for looking up opening theory, to see if those exact moves have been played by GM’s, and how they handled the situation. Check out 365chess.com and chesslab.com, for starters.