Set Play:
1.- Bc6 [a]  2. Qc5 [A] #
1.- Rc6 [b]  2. Qb5 [B] #
Try: 1. Qh1? [2. Qb7 [ #]
1.- Bc6 [a]  2. Qg1 [C] #
1.- Rc6 [b]  2. Qb1 [D] #
But 1.- f3!
Solution: 1. Qf3! [2. Qb7 [ #]
1.- Bc6 [a]  2. Qf2 [E] #
1.- Rc6 [b]  2. Qb3 [F] #