the system must have these elements: the move number, the piece moved, the square it starts from (optional), the square it goes to, and other relevant information such as captures, and castles.&lt;ref name="h/w"&gt;hooper d. and whyld k. 1992. "the oxford companion to chess". 2nd ed, oxford university press.&lt;/ref&gt;p275 there are other notations for recording positions.