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The result for the External Counterparty is as follows:
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How to trade your own book?
This concept and with the mentioned settings can be used by the house as well to trade from the houses own book.
Simply select the house as the counterparty to any trade when conducting the fill and the position will end up in the house instead. The house can then exit the position on the exchange through an external counterparty or to a different customer in the Bricknode Broker system at the same or a different price.