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