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diff --git a/doc/diagrams/useCase_useAsBackend.puml b/doc/diagrams/useCase_useAsBackend.puml
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+++ b/doc/diagrams/useCase_useAsBackend.puml
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+@startuml
+
+!include skinparams.puml
+
+actor "Opponent" as opponent
+actor "GUI Program" as program
+
+boundary "Engine CLI" as cli
+control "Play a stone" as playStone
+control "Think next move" as think
+entity "Board state" as state
+
+loop until starting board is set
+    program -> cli : play stone
+    cli -> playStone
+    playStone -> state
+    cli <- state
+end
+
+loop until game ends
+    program -> cli : ask for move
+    cli -> think
+    think -> state
+    cli <- state : Show move
+    opponent -> program : give input
+    program -> cli : play stone
+    cli -> playStone
+    playStone -> state
+    cli <- state
+end
+
+@enduml