the board with falling piece in valid position the board with the falling piece in an invalid position on the left boardthe falling piece' (that isthe top left corner of the falling piece'sxy coordinates are ( on the board but the boxes inside the falling piece' coordinate system have their own coordinates to find the --board|coordinates of these pieceswe just have to add the --board|coordinates of the falling piece' top left box and the --piece|coordinates of the boxes on the left boardthe falling piece' boxes are at the following --piece|coordinates( ( ( ( when we add the ( coordinate (the piece' coordinates on the boardto these coordinatesit looks like this( ( ( ( after adding the ( coordinate the boxes are at the following --board|coordinates( ( ( (