1.Kc6!!

(1.c6? b2 2.c7+ Ka7 3.c8Q b1Q = )

1…Kc8 2.d7+! Kd8 3.Kd6! b2 4.c6 b1Q 5.c7# - mm

Else

1…b2 2.d7! b1Q 3.d8Q+! Ka7

(4.Qb6+? Q*b6+! 6.cb Ka8!! 7.Kc7 – msm

7.b7+ Kb8! 8.Kb6 – msm)

4.Qa5+! Kb8 5.Qb6+! Q*b6 6.K*b6! Kc8 7.Kc6!

(7.c6? Kb8! 8.c7+ Kc8! 9.Kc6 – echo-chameleon msm)

7…Kb8 8.Kd7!