The Flash Crash bot sets pre-orders above and/or below a specified base price. Buy orders are placed at predefined price points that fall below the set base price. Conversely, sell orders are placed above this base price. When a buy order has been completed, the base price will be moved down and a sell order will be placed on the old base price. Conversely, when a sell order has been completed the base price moves up and a buy order is placed on the old base price.