In this model there are three different scenarios that can occur. These are:
It is of interest to examine parameter values which produce all three cases. A good place to start might be the set of classical Prisoner's Dilemma parameters. As defined earlier, these are:
Player 1 

Which strategy wins under these parameters? Is this consistent with the explanation in the Prisoner's Dilemma entry in the library?
Now try different arrangements of these numbers (remember only certain combinations are allowed). Two interesting alternatives are:
Player 1 

Player 1 

With the latter example try increasing some of the parameters slowly and observe what happens. At what point do you get switching from defectors dominating to cooperators dominating?
Can you produce a similar set of results with a different set of parameters (e.g. 1,2,3,4)? What are the relationships between the parameters that determines which type wins?