With that payoff matrix, you can quickly see that both the red and blue armors are dominated. You should never use either. If the opponent has a blue weapon (s1) you want green armor (a4) so you take the least damage. If they have a red weapon (s2), you want yellow armor (a3). If they have a yellow weapon (s3), you want green armor (a4). If they have a green weapon (s4), you want yellow armor (a4).
This shrinks the strategy space considerably. In equilibrium, everyone will have yellow or green armor. If they have yellow armor (a3), then you want the yellow weapon (s3) to damage them the most. If they have the green armor (a4) then you want the green weapon (s4).
So everyone should be randomizing between yellow and green armor, and yellow and green weapons.
I got the same numbers.
With that payoff matrix, you can quickly see that both the red and blue armors are dominated. You should never use either. If the opponent has a blue weapon (s1) you want green armor (a4) so you take the least damage. If they have a red weapon (s2), you want yellow armor (a3). If they have a yellow weapon (s3), you want green armor (a4). If they have a green weapon (s4), you want yellow armor (a4).
This shrinks the strategy space considerably. In equilibrium, everyone will have yellow or green armor. If they have yellow armor (a3), then you want the yellow weapon (s3) to damage them the most. If they have the green armor (a4) then you want the green weapon (s4).
So everyone should be randomizing between yellow and green armor, and yellow and green weapons.