Instructions summary

The two roles

Role A: The person in role A is given 10 points and decides first.
Role B: The person in role B does NOT receive any points and decides second. The person in role B observes the decision of the person in role A before making the own decision.

The person in role A has the following two options:
Option 1: You keep your 10 points for yourself
Option 2: You give your 10 points to the other person. The 10 points are then tripled, i.e. the other person receives 30 points.

The person in role B is informed whether the other player has kept or sent the 10 points.
The person in role B must then decide how many of the points now available to him/her will be returned to the person in role A.

Depending on the decision made by the person in role A,
the person in role B can either return 0 points (if person A chose option 1),
or return up to 30 points (if person A chose option 2).
The person in role B can select any integer between 0 and the maximum number of points at their disposal.

Possible outcomes

Person in role A:
The total number of points of the person in role A is made up of the number of points they have kept for themselves plus the number of points returned by B.

Person in role B:
The total number of points of the person in role B is equal to the tripled number of points sent by the person in role A, minus the number of points sent back to the person in role A.