Specification Model of the Game 
-----------------------------------------------------------------------------

// run the game, administrate the players and the die, play all turns
+-----------------------+        
| Server                |                            // represent the player
+-----------------------+ 1                        * +-----------------------+ 
| SPlayer players       | -------------------------> | SPlayer               | 
+-----------------------+                            +-----------------------+ 
| void register(Player) |                            | void inform(String)   | 
| // add a player       |                            | // accept information | 
| // for new game       |                            | // from server        | 
|                       |                            |                       | 
| String play()         |                            | boolean turn(Turn)    | 
| // run game, construct|                            | // play turn, done?   | 
| // msg about result   |                            |                       | 
+-----------------------+                            | void record(int)      | 
            | 1                                      | // record result      | 
            |                                      1 |                       | 
            |                     +----------------> | void cheat()          | 
            |                     |                  | // record attempt to  | 
            |                     | *                | // cheat              | 
            v 1                   v                  +-----------------------+
                           // one turn for player               |         
      // a single die      +-------------+                      |
      +-------------+ 1  1 | Turn        |                      | 1
      | Die         | <--- +-------------+                      |
      +-------------+      |             |                      | 
      |             |      | int roll()  |                      v 1
      | int roll()  |      | // roll die |           // the actual player code 
      |             |      |             |           +-----------------------+ 
      +-------------+      | void skip() |           | APlayer               | 
                           | // skip turn|           +-----------------------+ 
                           +-------------+           | String name           |
                                  ^ *                |                       |
                                  |                  | void inform(String)   | 
                                  |               1  | // accept information | 
                                  +----------------> | // from server        | 
                                                     |                       | 
                                                     | boolean turn(Turn)    | 
                                                     | // play turn, done?   | 
                                                     +-----------------------+ 
                                                                /|\
                                                               / | \
                                                                 |
                                                                 |
                                                                 |
                                 +-------------------------------+------------+
                                 |                                            |
                                 |                                            |
                                 |                                            |
                        // a machine player                     // a human player
                        +------------------+                    +------------------+
                        | MPlayer          |                    | HPlayer          |
                        +------------------+                    +------------------+
                        |                  |                    |                  |
                        +------------------+                    +------------------+
                                ^ 1                                     ^ 1
                                |                                       |
                                |                                       |
                                |                                       | 
                                v 1                                     v 1
                        // a machine view                       // a human player
                        +------------------+                    +------------------+
                        | MView            |                    | HView            |
                        +------------------+                    +------------------+
                        |                  |                    |                  |
                        +------------------+                    +------------------+