May I refer to an earlier answer, which I hope answers your question:
"Let's say a bishop is on a4/4."
Let me be specific: a bishop doesn't stand on a4/4; he stands either on 4 or a4. The player must clearly mark the location.
If the bishop is on 4, then his path goes via b5, c6, d7 to e8. In the other direction it goes via b3, c2 to d1.
If the bishop is on a4, then he can choose; he can go down to d1 as before. He can move upwards to a5 in a first move, to go via b6, c7 to d8 in a second move. The other option is to move to f8 via c5, d6, e7.
May I refer to an earlier answer, which I hope answers your question:
"Let's say a bishop is on a4/4."
Let me be specific: a bishop doesn't stand on a4/4; he stands either on 4 or a4. The player must clearly mark the location.
If the bishop is on 4, then his path goes via b5, c6, d7 to e8. In the other direction it goes via b3, c2 to d1.
If the bishop is on a4, then he can choose; he can go down to d1 as before. He can move upwards to a5 in a first move, to go via b6, c7 to d8 in a second move. The other option is to move to f8 via c5, d6, e7.
There are no other move-options.