A chess board has 8 squares on each side (64 on the board in total), so take your wooden box and divide the length/width by 8. Using a ruler, mark the lines on the lid of the box.

According to the World Chess Federation, the dimensions of a chessboard square should be between 5 and 6.5 centimeters (2 to 2.5 inches). For my own board, I went with 2 inches.