Seeing Tag:sport=chess as a reference may help.

How to Map

Since this is a non-physical tag, it should always be combined with some appropriate (physical) tag. For example:

  • With leisure=pitch when tagging big chess-boards in the open air
  • Some users have added leisure=picnic_table to tag public chess-playing tables, however this is inconsistent since the table is not used for picnics (see discussion page)

See also Tag:amenity=table.