Info: The problem of eight queens 
This problem is to place 8 queens on the chess board so that they do not check each other. This problem is probably as old as the chess game itself, and thus its origin is not known. There are actually 92 solutions. If we exclude symmetry, there are 12 solutions. 
Below is one of the answers just to show it IS possible. Can you find any more ?

8 


X 





7 




X 



6 

X 






5 







X 
4 
X 







3 






X 

2 



X 




1 





X 



A 
B 
C 
D 
E 
F 
G 
H 