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Obviously a term made up of the words chess and testosterone and used by canadian chess grandmaster Eric Hansen in the description of a youtube video called "BULLET CHESS Nightcore edition", in which he exclusively plays chess games in a mode called "Bullet". Therefore he does not have much time to think about his moves, but as it is not fast enough for him, he even goes "Berzerk", limiting his time to 30 seconds, instead of one minute.
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