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Okay. It's a statement too broad that may be appropriate in the context of the tutorial, but I recommend you don't accept it as a significant learning point to be applied to future projects. There...

Where did you read this?

To add to your confusion, this:

UserInterface.x_pressed = 10;

is not object-oriented programming (OOP). It's anti-OOP. If you're using that statement in your ChessEngine class (what it should...

"Symbol not found" means you've used a variable name that hasn't been declared within the scope you're using it. It's difficult to guide you to a solution without seeing the code, so post the code...

You've evolved some. Now that you actually have a constructor, I recommend you review the code you have in the main() method you showed in post #9 and move most of that to the constructor. The...

Typically in the constructor.