
Solution
R3b+

R3b+ threatens +R2a

R3b+

R3b+ threatens +R2a

N*2d

N*2d threatens G*1b

B2c+

B2c+ threatens G*3b

R5b+

R5b+ threatens G*3b

G3c

G3c threatens G*2b

L2c+

L2c+ threatens G*1b

B3a+

B3a+ threatens G*2b

R3b+

R3b+ threatens N*2c

B2c+

B2c+ threatens G*1b

R3a+

R3a+ threatens G*2b