roshambo (Rock Paper Scissors)

Rock Paper Scissors (also called roshambo) is one of the most basic hand games.

It is played by two players, which in each round choose one of the gestures paper, rock or scissors and show them at the same time. If the two gestures chosen are different, the winner is computed as follows:

• paper wins over rock
• rock wins over scissors
• scissors win over paper

For each round a point is awarded to the winner (if any). The player with most points at the end wins.

Implementation details

Both players and the spectators will receive three lines at the beginning of the match, containing the two players names and the number of rounds. Each player will receive its own name as the first line.

For instance, if there are two players Player0 and Player1 in a match with 42 rounds, then:

Player0 will receive:

Player0
Player1
42

Player1 will receive:

Player1
Player0
42

Spectators will receive:

Player0
Player1
42

Then, for the number of rounds specified, both players will have to send their choice of move to the server using one of the strings ROCK, PAPER or SCISSORS with a single LF (aka \n) at the end. After sending a move choice, they will have to read a single line containing the choice of the opponent. Other then the opponent choice, the string RETIRE can also be received, which means the opponent as retired and the player must exit the match. This cycle will then repeat for the remaining rounds.

Spectators will receive for each round two lines containing the choice of the two players. The lines are given in the same order as players names at the beginning of the stream.

For instance, if in a round Player0 chooses ROCK and Player1 chooses PAPER, then (sent lines are prefixed with a >):

Player0 will receive:

>ROCK
PAPER

Player1 will receive:

>PAPER
ROCK

Spectators will receive:

ROCK
PAPER

A complete game can look like this:

Player0 will receive:

Player0
Player1
3
>ROCK
PAPER
>PAPER
PAPER
>ROCK
SCISSORS

Player1 will receive:

Player1
Player0
3
>PAPER
ROCK
>PAPER
PAPER
>SCISSORS
ROCK

Spectators will receive:

Player0
Player1
3
ROCK
PAPER
PAPER
PAPER
ROCK
SCISSORS

Game parameters

There are two game specific parameters available:

• rounds: specifies the number of rounds;
• pace: specifies a minimum time interval (in seconds) between rounds.