Definition of "simple situation" is ambiguous &quot;Simple” situations (where it is easy to predict which strategies will be chosen by the different agents):

Each participant has a strategy that outperforms all others regardless of the strategies adopted by its partners.


How can everybody have a strategy that outperforms everybody else's strategy?
Consider the typical prisoner’s dilemma,

$$
\begin{array}{|c|c|c|}\hline
&amp;{\rm confess}&amp; {\rm lie} \\ \hline 
{\rm confess} &amp; \color{red}{-8},\color{blue}{-8} &amp; \color{red}{0},\color{blue}{-10} \\ \hline
{\rm lie} &amp; \color{red}{-10},\color{blue}{0} &amp; \color{red}{-1},\color{blue}{-1} \\ \hline
\end{array}
$$

In this case it is easy to predict that each player should play confess, regardless of the the selection made by the other player. Or in the words of the problem:


  The best strategy (the one that outperforms other strategies) is to confess regardless of the strategy adopted by other players