From Halopedia, the Halo wiki
To create a map capable of playing chess a single hill marker must be placed in Forge with the label BOARD_CENTER. A full chess board with NPCs for chess pieces will then be automatically generated when playing on the map variant under the Halo Chess gametype. Currently the BOARD_CENTER label is only available with Halo Chess chosen in the Forge lobby and while editing Forge World, Tempest, or Anchor 9.
White Team uses the Noble Team character models, but with white primary color, while Black Team uses the different Sangheili classes in their Campaign color schemes. The characters replace the piece that they are most similar to, and in some cases have a different weapon to better fit that role.
Glitches and bugs
Because Chess was created by altering the game's coding, there are a number of small glitches and bugs, though most of them do not affect gameplay.