@startuml
'fig_7'
left to right direction
skinparam monochrome true
skinparam handwritten false
hide class circle
hide abstract circle
skinparam shadowing false
skinparam classAttributeIconSize 0

allowmixing

actor :Player 1: as p1
object "Chess Set" as cs
actor :Player 2: as p2

p1 --> cs : make_move
cs <-- p2 : make_move
@enduml
