a) diagram

1.g2-g1=R Kf2-f3  
2.Rg1-g2 Rh1-c1  
3.Rg2-d2 Rc1-c3 #

1.Kd3-c2 Rh1-b1  
2.g2-g1=R Kf2-e2  
3.Rg1-c1 Rb1-b2 #

b) wBh8-->d1 

1.g2-g1=S Rh1-h4  
2.Sg1-f3 Rh4-c4  
3.Sf3-d2 Bd1-e2 #

1.g2-g1=R Bd1-b3  
2.Rg1-c1 Kf2-f3  
3.Rc1-c3 Rh1-d1 #

c) wBh8-->c3 

1.g2-g1=S Kf2-g3  
2.Kd3-e2 Rh1-h2 +  
3.Ke2-f1 Rh2-f2 #

1.Kd3-e4 Kf2-e2  
2.Ke4-f4 Rh1-h4 +  
3.Kf4-g3 Bc3-e1 #

The same pieces of the opposite color moves on the same field.
Different pieces of the opposite color moves on the same field.
Different pieces of the same color moves on the same field.
Promotion black to one field. (Author)
Award: Pat a Mat 109, 9/2019, Judge: Menachem Witztum (Izrael), 6.6.2019