AI is beatable

[RomainL972]

I cloned your repository and tried to play against the AI. There is one case where I win but the website says "Match nul!"
Here are the steps:

Turn 1
 | | 
-----
 | | 
-----
O| | 

Turn 2
 | | 
-----
 |X| 
-----
O| | 

Turn 3
O| | 
-----
 |X| 
-----
O| | 

Turn 4
O| | 
-----
X|X| 
-----
O| | 

Turn 5
O| | 
-----
X|X|O
-----
O| | 

Turn 6
O|X| 
-----
X|X|O
-----
O| | 

Turn 7
O|X| 
-----
X|X|O
-----
O|O| 

Turn 8
O|X|X
-----
X|X|O
-----
O|O| 

Turn 9
O| |X
-----
X|X|O
-----
O|O|O

If you prefer a gif :