Play coded chess with an anonymous opponent
From Fallen London Wiki
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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 
Watchful 250, 
Subtle 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. [...]"
Subtle is increasing… (+15 CP)
Forceful is dropping… (-15 CP)
You've lost 1 x Copper Cipher Ring
