Lower rated players I’d stay in book.
In the Harvard Open years ago and other tournaments (way back then) I used the Center Counter as black almost exclusively. Always caught them by surprise. Saved clock time also. The Colle as white was safe and strong.
The g3 system that Carlson safe and looks for technical advantage. It appeared he got what he wanted with double black f pawns structural.
My late good friend came over from Germany at the time of Kaiser Wilhelm II. He once played Capablanca in a 103 board simultaneous. We became close friends when as a boy I defeated the Paris Champion in a simultaneous exhibition.
When Kasparov lost to Deep Blue my interest left.
I look for the Savior to come soon now. May Carlson find peace.
(sen)