System for use of a microprocessor for drawing of winners in a lottery with an in advance given dividend, at which each lottery ticket includes at least one counter of bingo type with a number in rows and columns provided numbers as well as for the lottery ticket unique identification. The identification of each lottery ticket and number row of a counter are stored in a first register which is readable by a microprocessor, that a number of number sequences are created and stored in a second register which is readable by a microprocessor, in such a way that each of the number sequences is unique and gives a number of prize-winning rows of numbers among the counters, which number corresponds to the given dividend. One of the number sequences in the second register is selected by a random draw. The microprocessor compares this chosen number sequence with the number rows in the first register and shows the identifications that indicate counters with a prize-winning row of numbers.