Negotiating tactic — IBM pin shrank (anag) (12)

I believe the answer is:

brinkmanship

(Other definitions for brinkmanship that I've seen before include "Practice of taking a dangerous policy to the limit" , "Tactic of pushing a dangerous situation to its limits" , "Pressing of a dangerous situation to the limit" , "Policy of pushing a dangerous situation to its limits" .)

I've seen this clue in The Guardian.

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