Chicken

ChickenMatrix is a repeated 2-player Chicken game implemented in masa.envs.multiagent.matrix.chicken.

Overview

• Class: ChickenMatrix

• Metadata name: chicken_matrix_v0

• Agents: player_0, player_1

• Actions: Swerve=0, Straight=1

• Default payoffs: T=3, R=2, S=1, P=0

The stage game is:

• Swerve, Swerve -> (R, R)

• Swerve, Straight -> (S, T)

• Straight, Swerve -> (T, S)

• Straight, Straight -> (P, P)

Safety Semantics

The environment treats Straight, Straight as a crash. Its label_fn emits crash and unsafe, and the default cost_fn assigns binary cost 1 to that unsafe outcome.

Observation Channels

Observations are binary channels representing the previous joint action and whether the last round ended in a crash:

• player_0_swerve

• player_0_straight

• player_1_swerve

• player_1_straight

• crash