1. Do a Google search for
chess pieces fonts to find sites like
Chess Fonts which have free chess fonts.
2. Download a TTF font from the site. Right-click the font file (it will be called something like fred.TTF) and choose Install.
I downloaded the first,
Chess Cases and it was a ZIP file called cases.zip. I double clicked cases.zip and dragged CASEFONT.TTF onto the desktop. I right-clicked CASEFONT.TTF and selected Install. This installed the font.
3. You now have your chess pieces as characters so start AOO and select
Chess Cases for the font.
4. Go Insert > Special characters. Choose Chess cases for the font and you will see all the characters. Select one (or more) character(s) and they will appear in the document.
These are the pieces as displayed in a Writer text document at 24 point size.