title 2. Invite friend to join game

participant Solid Chess [A]
database POD B

autonumber 1

Solid Chess [A]->POD B: GET: WebId
POD B-->>Solid Chess [A]:  RDF
note over Solid Chess [A]: determine inbox url\nof player B
Solid Chess [A]->POD B: POST: invitation (RDF) to inbox

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