The diagonal is long

The long diagonal is a frequent battleground - for opposing bishops, or perhaps bishop versus pawn chain. Emmanuel Lasker in particular preferred blunting the long diagonal at the first indication of a fianchetto.

In a recent Bishop's Opening game, the following position was reached that reminded me of a couple of things:

1. If you're going to exchange your fianchettoed bishop, trade it for the bishop of the same color.

2. Even simple positions can yield fireworks.

It's all very well to miss a two-mover in the heat of battle, but I think that the moment the diagonal opened, Black was obliged to ask "what sort of horrible things can occur?" That pawn moving out of the way was a stop sign, and heeding the warning would have let Black continue the game.

I'm really enjoying the Bishop's Opening, by the way - it has revived my love of 1 e4.