Nash equilibrium is the strategy where each player earns highest
payoff given other player's strategy. It means any one player can't
earn a higher payoff by deviating from the Nash equilibrium given
the other player doesn't change his strategy.
At [charge, charge], each player earns his best
payoff given other player's strategy.
When Napoleon charges, it is best for Kutuzov to charge and when
Kutuzov charges, it is best for Napoleon to charge as well.
Therefore, [charge, charge] is a Nash equilibrium.
At Nash equilibrium, Napoleon earns 4 and Kutuzov earns 2.
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