You can place an order at 8: 55. The price of 5660 can't be traded, because the outer disk plummeted and the inner disk opened sharply lower.

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.