The image of "Chessboard in Blackwork embroidery, using Holbein stitch". This image is originally from here:commons.wikimedia.org/wiki/File:BlackworkChessboard.jpg.which is into the Public Domain.
棋盤
blackwork、chessboard、embroidery、Holbein、stitch、yamachem
blackwork、棋盤、刺繡、荷爾拜因、縫、Yamache米
資料來源：openclipart ( https://openclipart.org/ )