Dear all, We are currently developing an open source soccer game based on the famous KickOff2 design (www.openkickoff.org). My question is about synchronization. 2 players are playing against each other over the network as shown below: PLAYER1 <==========> SERVER <==========> PLAYER2 (L.A.) (Dallas) (Paris) Our technic is event-based. Everytime something happens, the event is sent over the network to the server and then forwarded to the other player. For example: P2 sends "Zidane starts running from 10,10 towards North". As we know the time separating P2 and P1 (=deltaT, the duration of the packet transmission), we can update P1''s screen and guess that Zidane is know running north and is now at location x=10, y=10-speed*deltaT. OK this works fine BUT sometimes there are bad synchronizations. Perhaps our technic is bad. I don''t know. Do you know famous ways of handling soccer-like games. Should the server in Dallas be a sort of referree ? Should we send all the event to the server and wait for a response (our soccer player would wait until starting running) ? Thanks for your help. herve@openkickoff.org PS: the game is GPLed, you can have a look at current source.