1.

Place 2 rooks and 4 kings on a 3×4 chess board so that each rook attacks 3 kings, and each king attacks 1 rook.

2.

Place 4 bishops and 4 knights on a 4×4 chess board so that each bishop attacks 2 knights, and each knight attacks 2 bishop.

3.

Place 4 rooks and 4 queens on a 4×4 chess board so that each rook attacks 2 queens, and each queen attacks 3 rooks.

4.

Place 2 knights and 4 queens on a 4×5 chess board so that each knight attacks 2 queens, and each queen attacks 1 knight.

5.

Place 2 bishops and 8 knights on a 4×5 chess board so that each bishop attacks 4 knights, and each knight attacks 1 bishop.

6.

Place 2 kings and 8 bishops on a 4×5 chess board so that each king attacks 5 bishops, and each bishop attacks 1 king.

7.

Place 2 bishops and 4 queens on a 4×6 chess board so that each bishop attacks 3 queens, and each queen attacks 1 bishop.

8.

Place 2 queens and 5 rooks on a 4×6 chess board so that each queen attacks 5 rooks, and each rook attacks 1 queen.

9.

Place 2 queens and 6 kings on a 4×6 chess board so that each queen attacks 5 kings, and each king attacks 1 queen.

10.

Place 2 knights and 6 rooks on a 5×5 chess board so that each knight attacks 3 rooks, and each rook attacks 1 knight.

11.

Place 8 knights and 6 rooks on a 5×5 chess board so that each knight attacks 2 rooks, and each rook attacks 3 knights.

12.

Place 8 bishops and 2 queens on a 5×6 chess board so that each bishop attacks 1 queens, and each queen attacks 7 bishops.

13.

Place 2 rooks and 6 bishops on a 5×6 chess board so that each rook attacks 3 bishops, and each bishop attacks 1 rook.