For example, I have heard the following statements:
- After 1. e4 e5 2. Nf3 Nc6, the move 3. Bb5 is marginally better than the move 3. Bc4.
- Openings moves such as 1. e4, 1. d4, 1. Nf3, and 1. c4 are equally good and none is marginally better than the others.
Are these two statements accurate? If so, is there any way to "prove" them?
I am not sure about the following argument:
Since after 1. e4 e5 2. Nf3 Nc6, 3. Bb5 is played more often by grandmasters than 3. Bc4, 3. Bb5 must be the better move.
As by the same logic, we can say 1. e4 is better than the other three popular first moves.