If you entrust 5500 to sell and close the position, and the opening price at 8: 59 is 5560, then the deal is made according to 5560.
If you entrust 5580 to sell and close the position, and the opening price at 8: 59 is 5560, then your order is still hanging on 5580 without closing the position.
How did the opening price come out?
At 8: 55 call auction time, according to all the orders, the closing price is the price that can contribute the largest turnover.