inversed design

Surprisingly, it´s completely logical. Thanks.

I don't see how it's logical, I had to decide either filling the squares on the top right and bottom left corner or not and developing after that, and found out there is two possible solutions either way you develop the hanjie.

Would be nice if someone can explain me how to get it logically after having the center and both mentioned corners solved.

Thanks for tip.

Thanx.