Play coded chess with an anonymous opponent

From Fallen London Wiki (Staging)
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From: Copper Cipher Ring


Here, in the dead-drop. This looks like a coded set of chess moves. Is someone in the Game using these channels for lighter pastimes?

Game Instructions: This will substantially increase Subtle and decrease Forceful; and consume your Ring.

Unlocked with  250,  12-14


Success

Impossible designs

You decipher the code [...] The game becomes clearer. You've guessed the rules correctly [...] You [...] finally achieve a checkmate. Their reply is [...] so elaborate [...] that [...] your ring [...] shivers to fragments. [...]"