For each pair (p, q) of (independently chosen) mixed strategies we have the

following expected values of the utilities:

uA = uA(p, q) = 5 · p · q − 2 · p − 2 · q + 1

uB = uB(p, q) = 5 · p · q − 3 · p − 3 · q + 2

We plot for each pair (p, q) the pair of expected utilities (uA(p, q), uB(p, q)) in

a diagram; so we get Figure. To every pair (p, q) corresponds a point of

the area R.