It's a very easy and very effective system which allows you to play 12 numbers on only 6 boards. Of course, we always aim at 6 good
numbers, but if only 5 numbers of the winning combination are among 12 numbers which you chose, you are sure to have at least 3 times 3 good numbers of it.
The board below serves you as guide to place well your numbers and obtain 6 combinations.
You can print it with the example.