The Brent oil price in roubles for quite some time is in the range of 3,000 to 4,000 rubles. Last time he played at the because the net never traded. From the calculation of current prices and the contract specifications, it is necessary to buy SI-12.15 and buy BR-11.15 in the ratio of 2.1 to 1 i.e. for every 10 contracts SI buy 21 contracts BR . Fixation of 3500 rubles.