Layer 2 protocol description

The DamExchange layer 2 protocol describes the contents and the flows of the messages that are exchanged between two Draughts computer programs. The first character position of each message denotes the message type.

The messages consist of character strings of 1 to 127 characters of the ASCII character set (values 1 to and including 127 only).

The dialogue between the two Draughts computer programs is as follows:

• The Initiator sends a GAMEREQ message (containing information about the game to be started) to the Follower.
• The Follower answers with a GAMEACC message.
• Next, MOVE messages (containing the played moves) are exchanged between the two Draughts computer programs. This occurs strictly alternating, also in case of forced moves, MOVE messages are exchanged.
• This process continues until one of the players sends a GAMEEND message instead of a MOVE message.
• This GAMEEND message is confirmed by the other program by sending back a GAMEEND message.
• For interactive games (human against computer) the possibility to move back exists by using BACKREQ and BACKACC messages.
• Each moment in time, also inbetween two games, the Initiator as well as the Follower can send a CHAT message.

If desired, the Initiator can start a new game over and over by starting from the beginning by sending a GAMEREQ message.

Messages:

• GAMEREQ
• GAMEACC
• MOVE
• GAMEEND
• CHAT
• BACKREQ
• BACKACC

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