A Japanese King in a Chess Joke

ser-h=13 (2+1)
Circe
bKh7 = Japanese King

"A Japanese King is simply a partial King which cannot move backward. When it reaches the eighth rank, it promotes into a full King and acquires an ability to move backward" (M.A. Ridley, Fairy Kings, "Mat Plus Review" 9-10, Spring-Summer 2009, p.18).

Donc, the solution is:

1. JKh6 2. JKh5 3. JKh4 4. JKh3 5. JKh2 6. JKh1= Full King 7. JKh2 8. JKh3 9. JKh4 10. JKh5 11. JKh6 12. JKh7 13. JKxRg8 (Rh1), Rh7 =