The Best Move in Chess?

Obviously, it's entirely dependent on the situation. This idea is for curiosity's sake only.

But, if it's not been done before, I think it would be interesting to run a database of GM games through computer analysis. Compare the evaluation before a move with after it and take the difference.

Then take the average value for every individual move. So all the times e4 has been played (not just as a first move). All the times Nf6 has been played. And so on.

What do you think would work out to be the 'best' move?

In reality, I think the system would give us the least bad move as the computer analysis would punish bad play much more than reward good play. Nevertheless:

Promotions would rarely be bad moves, but that's obvious.

Nf3 is good in a huge number of situations. cxd4 is often quite good. Bg7?

Anyone have the power to put this together or care to take a guess at a 'best' move?