Solution
1.S*2d 2.Sx2d 3.B2b+
1.S*2d 2.Sx2d 3.B2b+
S*3a
S*3a threatens G*2b
P*2c
P*2c threatens G*2b
1.R3b+ 2.G*2b 3.G*1a
1.B1b+ 2.Kx1b 3.N2c+ 4.K1a 5.+Bx3c 6.Sx3c 7.S*1b
R3b+
R3b+ threatens S*1b
How to win material
1.P*4c
1.R2a+ 2.Kx2a 3.N*1c 4.K1b 5.P2c+
1.B*3a
How to win material
1.P3d