[Gal Longin]

The answer to your qeustion was published by First in the Team Update #1 :

DIistirbution of tetras (the information below is for red or blue)

The human player mat areas will have approximately 3 stacks of 6 tetras each = 18.

The loading platform areas will have approximately 2 stacks of 8 tetras each = 16.

1 robot starts with a tetra = 1.

2 vision tetras each side = 2.

2 tetras in each corner goal = 2.

This totals 39 red and blue on the field. Field attendants will make reasonable
attempts to ensure that the tetras are evenly distributed during matches, i.e., will
attempt to ensure that no areas get depleted of tetras.