Deletion of Chess diagram

Comment: It is easy to find sources which talk about such diagrams in detail.  For example, see ''https://books.google.co.uk/books?id=QwiPBAAAQBAJ&pg=PA123 Resemblance and Representation''.  The worst case would be merger into another page such as chess notation.  Please see |alternatives to deletion
Stance: keep
Cited policy: Wikipedia:Deletion policy (WP:ATD)