Moscow Exchange from November 2, 2020 sets a limit on the size of price deviation when executing market orders on the stock market in order to protect investors from mistakes in their submission. Its value for instruments included in the calculation base of the IMOEX Index and bonds, except for OFZ and COBR, will be 1%. For other equity market instruments, it will be 3%. For OFZ and COBR - 0.4%. The unfulfilled balance of the market request will be withdrawn without satisfaction. The algorithm will be used at the main and evening trading sessions. In opening and closing auctions its application is not provided.