@startuml

!include skinparams.puml

actor "Player" as player

boundary "Game CLI" as cli
control "Play a stone" as playStone
control "Show board" as showBoard
entity "Board state" as state

loop until game ends
    player -> cli
    cli -> playStone
    playStone -> state
    showBoard <- state
    cli <- showBoard
end

@enduml