How i made chessboard ,
as suggested in the task description i wanted to use checker shader, but i also wanted ubes of side 57 mm so i multiplied 57 by 8 and that was the length of a side of the chess board and while using checker shader i divided it into ggroups of 8 so i got 64 cubes of each of side 57 mm , then i made borders and base then i hollowed out 2 borders for placing the chess pieces ;)