Use the <game GID> - Dragon tag to link to a game. Use the <game GID,move> - Dragon tag to link to a certain move in a game. Use the <game GID,S> - Dragon tag to link to the setup-position of a shape-game.
If you are in the context of submitting a move for a game, you can also use the shorter form to link to a specific move of the game with: <move 45> or <move S> respectively This will be substituted with the corresponding markup of the current game: <game GID,move>