The file "chess" supports \u2654 to \u265F inclusive. See [Wikipedia](https://en.wikipedia.org/wiki/Chess_symbols_in_Unicode).
The font FreeSerif.ttf supports these glyphs - see [GNU FreeFont](https://en.wikipedia.org/wiki/GNU_FreeFont).

The file also has RNBQKBNRPrnbqkbnrp used as ASCII chess symbols.