Chess Avoidance Puzzles

Place the chess pieces provided on the chess board provided so that no piece attacks any other.

Each puzzle below has a unique solution.

On the board:
1.    
2.    
3.    
On the board:
4.    
5.    
6.    
7.    
8.    
9.    
10.    
On the board:
11.    
12.    
13.    
14.    
15.    
On the board:
16.    
17.    
18.    
19.    
20.