A Mixed "Switchback"

Ser-h#10

Volage*

1.Kd8-e7 2.Ke7-e6 3.Ke6-e5 4.Ke5-f4 5.Kf4-f3 6.Kf3-g2 7.Kg2-h3 8.Kh3-h4 9.Bf1-h3 10.g3-g2=w g2-g3 #

* The colour of a piece (King except) changes the first time (and only the first time) it moves on a square of different colour.