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The first act following the Machine and Samaritan's cold war summit, which ended in a standoff, is that Samaritan starts to take the market down by crashing the New York Stock Exchange. Samaritan's plan entails a few small rebounds to prevent the fail-safe system from kicking in. Reese, Finch, Root and Fusco know that the best way to combat this take down is not to deal with anything on the market floor, where the minority of trades are actually made, but to deal with the server in the Exchange's basement, the server which processes the vast majority of trades. Shaw is not with them as she still needs to hide from Samaritan's cameras. As such, Shaw has her own task off site. Both the foursome and Shaw's tasks end up not being as straightforward as they would have liked, each placed in a precariously life threatening situation. Root has to wait for the Machine to evaluate all the possible options for success before moving. The question becomes if there is not one option which has a 100% probability of success, if the Machine will listen to a lesson taught to her by Finch in 2003 when he taught her how to play chess in evaluating what will be the best option.