I saw this in Keres endings book and found it both difficult to solve and
entertaining.
1.Bg5
Kb6
to prevent the white bishop raching a7
2.Be3+
Ka6
3.Bc5
Be5
4.Be7
Kb6
to prevent the white bishop raching c7
5.Bd8+
Kc6
this is almost back to the starting position, but with one important difference, as illustrated by white's next move
6.Bf6
Bh2
7.Bd4
Bf4
8.Ba7
Bh2
9.Bb8
Bg1
10.Bg3
Ba7
11.Bf2
1-0