Basic Backgammon for multiplayers

I need an very Simple BACKGAMMON game which will be written in only python language with a very simple user interface. It is an class project to do; therefore classic rules of backgammon are not required except main ones. Two client must play the game via a server. All messages must go through the server, so clients are not allowed to send message to each other. Server also let to play game with many other users. Application shall welcome users with a welcoming page TO choose AN UNIQUE USERNAME,ip address and host [login to view URL] the username is chosen for that session, user shall choose another USERNAME. Two button is required in the welcoming page; "PLAY" or "WATCH". After client choose an username, he shall click to "PLAY" to let the server to match a opponent randomly and start the game(session). Meanwhile server should check is there any user to match. Server shall NOT check the correction of moves. When user clicked the BUTTON "ROLL DICE" server should returned dices randomly and client shall make move and server shall understand users move to show in both side. If the move is wrong server shall NOT care. There shall be button that says "REPORT WRONG MOVE". If the user opponent believe that move is wrong, he shall clicked the button and server change the checker positions to the one previous situation. After game is done, server should understand it and sends a message to the client as "winner is x" and add back users to the list of players. Users shall be able to watch a game that is playing between different users. Heartbeat messages shall be send from server to the clients in 20 second to check they are online or not. If the client is not online user shall be removed from the list.(for example ping pong messages) Project requires comments, every function should have comment to tell what is the duty of the function. Aim of the project is how python language works coherently with sockets and threads. Therefore rules are different and not make sense. Many users shall connect to the server with and be able to play it with random opponents. thanks in advance