Proof: From the definitions of χ∗ i and χ∗∗ i in Section III-A, it can be shown that, irrespective whether outage occurs or not, the dominating strategy of player Pi when χi ≤ min(χ∗ i ,χ∗∗ i ) is FD, and when χi ≥ max(χ∗ i ,χ∗∗ i ) is HD. When min(χ∗ i ,χ∗∗ i ) < χi < max(χ∗ i ,χ∗∗ i ), following the same approach in the proof of Theorem 1 (by deriving the conditions under which Pi’s expected utility under the FD strategy is higher than that under the HD strategy while fixing the other player strategy, and solving the two resulting inequalities along with p21 + p22 + p23 = 1, it can be shown that the dominating strategy is given by (8) when θi = 2. Hence, Theorem 2 holds.