What you need to do is select all and copy the eight squares and their outlines. Create a new layer under the current one and paste the eight squares there. Move it until the bottom of the new set touches the top line of the old set. Center both middle lines on each other. Choose Modify>Transform>Flip Horizontal. (We need to do this since the pattern of the board is checkered.) Then all you need to do is scale the new eight squares down until the lines match up. There really is no precise way to go about this so just use your eye and zoom in to make sure everything is lined up right. ItΓÇÖs not hard. Once youΓÇÖve finished you should have two rows of the board that are in perspective.
The rest is easy. Select All again, copy it, make a new layer and paste the two new rows in, move them to line up and scale them to match.
