En Passant unexpected bahavior

En Passant leads to weird possible moves, see pictures.

![1a](https://user-images.githubusercontent.com/9353871/78505392-82587100-7773-11ea-859d-82acb5f58c9d.png)
![1b](https://user-images.githubusercontent.com/9353871/78505403-90a68d00-7773-11ea-8091-5594a13f6499.png)
![1c](https://user-images.githubusercontent.com/9353871/78505405-92705080-7773-11ea-8136-8ae21717fb17.png)
