It's an easy and effective system which allows you to play 15 numbers on 10 boards. Of course, we always aim at 6 good numbers of the winning combination, and if they
are among 15 numbers which you chose, you are sure to have at least 4 times 3 good numbers of it. The board below serves you as guide to place well your numbers and
obtain 10 combinations. You can print it with the example.