Here is a pretty simple idea that may be worth testing a bit to see how it goes.

I will give a quick example using the sixlines and the quads.

Sixlines...

1-6

7-12

13-18

19-24

25-30

31-36

Quads...

1-9

10-18

19-27

28-36

I got the following numbers from Spielbank Wiesbaden.

24

13

31

19

27

29

24

4

18

29

30

14

22

29

17

I will convert the above numbers to the Quads first.

3

2

4

3

3

4

3

1

2

4

4

2

3

4

2

Now it's pretty simple. All you do is look for the most recent two of the same and bet for that until there is a change and you have a new most recent two.

So here is how it would go for the Quads.

3

2

4

3 **The 3 here is the most recent two**

3 win (+3)

4 loss (+2)

3 win (+5)

1 loss (+4)

2 loss (+3)

4 loss (+2) **The 4 is now the most recent two**

4 win (+5)

2 loss (+4)

3 loss (+3)

4 win (+6)

2 loss (+5) **The 2 is now the most recent two**

Now here are the numbers converted to the Sixlines.

4

3

6

4

5

5

4

1

3

5

5

3

4

5

3

Here is how it would go for the Sixlines.

4

3

6

4 **The 4 is the most recent two**

5 loss (-1)

5 loss (-2) **The 5 is the most recent two**

4 loss (-3)

1 loss (-4)

3 loss (-5)

5 win (level)

5 win (+5)

3 loss (+4)

4 loss (+3)

5 win (+8)

3 loss (+7) **The 3 is the most recent two**

That's it basically.

I was thinking about progressions for this.

For the Quads...

Maybe something like 111 222 333

For the Sixlines...

1111 2222 3333

or something along those lines.

cheers