1.Ba6? Kg2!

1...g2? 2.Kb5 (Indian) Kf1 3.Kb4+ Kg1 4.Kc4 Kf1 5.Kd4+ Kg1 6.Kd3 Kf1 7.Kc2+ Kg1 8.Rb1 d1Q+ 9.Kxd1 Bxc3 10.Kc2+ Be1 11.Rxe1#

1.h3! g2 2.Bc8 Kf1 3.Ba6+ Kg1 4.Kb5 Kf1 5.Kb4+ Kg1 6.Kc4 Kf1 7.Kd4+ Kg1 8.Kd3 Kf1 9.Kc2+ Kg1 10.Rb1 d1Q+ 11.Kxd1 Bxc3 12.Kc2+ Be1 13.Re1#

Logical problem. Creation battery BK and RK. Herlin's maneuver. Pin mate