First you need to run the server, to do this run mvn clean package it will generate a spring-boot runnable jar inside target directory, after this run java -jar gameofthree-0.0.1-SNAPSHOT.jar the game serve is ready to receive connections.

To run the client, run mvn clean package it will generate a spring-boot runnable jar inside target directory, then you can run the client with java -jar GameOfThreeClient.jar

You need to instances of the client running to be able to play.

Also you can set the environment variable game_mode_automatic=true so that one or both players plays automatically as soon as one of them send the first number.

When a player starts, it incepts a random (whole) number and sends it to the second player as an approach of starting the game. The receiving player can now always choose between adding one of {-1, 0, 1} to get to a number that is divisible by 3. Divide it by three. The resulting whole number is then sent back to the original sender. The same rules are applied until one player reaches the number 1(after the division).