The name Mad Chess is already in use by another variant, but maybe you could distinguish yours by calling it M.A.D. Chess or Mermaids, Angels and Dragons Chess. You can create a page for your game. You might want to create a link page to your Steam app page, or you might want to create a page describing the game's rules. See How to Design and Post Your Own Game for further details.
The name Mad Chess is already in use by another variant, but maybe you could distinguish yours by calling it M.A.D. Chess or Mermaids, Angels and Dragons Chess. You can create a page for your game. You might want to create a link page to your Steam app page, or you might want to create a page describing the game's rules. See How to Design and Post Your Own Game for further details.