This is a Multi-Matrix layout method:
http://betselection.cc/meta-selection-105/multi-matrix-layout/

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Directional trio definition:

A straight line comprising 3 numbers on the matrix layout.

They are the following.

Horizontal:

[attachimg=1]

Vertical:

[attachimg=2]

Main diagonal:

[attachimg=3]

Minor diagonal:

[attachimg=4]

They can overlap. i.e. A line of 4 numbers is taken as two overlapping trios:

[attachimg=5]

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Single attack bank:

36 units max.

Procedure:

1) Mark last 37 spins. (Singles and repeaters must be marked differently).
2) When a single would make another (+1) of the already realized diagonals, you bet on it.
3) You attack ends on any plus, break even or when next bet demands more than -36.

On a finished attack, you can re-track by going back to step 1.

Just published a testing thread for illustration:

http://betselection.cc/testing/testing-1-directional-trio-repeaters-multi-matrix/

Feel free to participate