Une sentinelle régicide

Ser-h#5

Sentinelles*

  1.Kd1-e1 2.Ke1-f2 3.Kf2-g2[+bPf2] 4.Kg2-h3[+bPg2] 5.Kh3-g3[+bPh3] Sh2-f3[+wPh2] #

* When a piece (not a Pawn) moves, a Pawn of the same colour appears on the vacated square, if it is not the first or the last rank, and if there are less than 8 Pawns of that colour on the board.