: You can set pieces on specific squares to find matching positions.

: .rar files from unofficial sites often contain "cracked" versions which may include malware or missing files (like piece sets or engine components).

: If your "proper piece" problem refers to missing piece graphics , this is often caused by a corrupt installation. You can usually fix this by going to File -> Options -> Graphics and ensuring a piece set is selected.

If you're having a specific technical issue, could you clarify:

: Define which pieces should not be on certain squares.

Are you (the board is empty or has weird symbols)? Are you unable to extract the .rar file properly?

: Right-clicking a highlighted piece can instantly show why a move is considered an error. Search Mask (Material & Position)