I have indeed trouble with your question. I don't understand how "B b4-b3" or "B b3-b5" has anything to do with a bishop's moves.
I want to answer your question like this and hope that I'm on the right track. You ask what a bishop can do with one move.
Let's start from d1. The bishop can move to the left via c2-b3-a4 to square a5. The following move is also possible: d1 via c2-b3 to square 4. From there, the color change takes place in a second move by reaching the squares b5-c6-d7 to e8.
To the right, the bishop can go to square 5, via e2-f3-g4.
If you think that's an asymmetry, then that's the result of the new board geometry. The opponent has the mirrored move options and thus equal opportunities.
Did I understand and answer your question correctly?
I have indeed trouble with your question. I don't understand how "B b4-b3" or "B b3-b5" has anything to do with a bishop's moves.
I want to answer your question like this and hope that I'm on the right track. You ask what a bishop can do with one move.
Let's start from d1. The bishop can move to the left via c2-b3-a4 to square a5. The following move is also possible: d1 via c2-b3 to square 4. From there, the color change takes place in a second move by reaching the squares b5-c6-d7 to e8. To the right, the bishop can go to square 5, via e2-f3-g4.
If you think that's an asymmetry, then that's the result of the new board geometry. The opponent has the mirrored move options and thus equal opportunities.
Did I understand and answer your question correctly?