Anothere [PSE chess question](https://puzzling.stackexchange.com/a/106199/70634):

    [FEN "4k3/pppppppp/8/8/8/8/PPPPPPPP/4K3 w KQkq - 0 1"]

    1.c4 Kf8 2.c5 Kg8 3.c6 Kh8 4.cxb7 h5 5.f3 c5 6.Kf2 c4 7.Kg3 Kh7 8.Kh4 c3 
    9.b8=B cxb2 10.g4 b1=B 11.g5 Bf5 12.Bf4 f6 13.e4 e5 14.exf5 exf4 15.g6+ 
    Kh6 16.h3 d5 17.d4 a5 18.a4 *