来自《耶鲁大学开放课程：博弈论 第19集 第19集》

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  and this is a little bit less trivial than the last one
  这个比上一个要更重要些
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  because now there are really two players playing.
  因为这会有两个参与人了
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  So here's the matrix that goes along with this.
  这个矩阵是这样的
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  Player 1 is choosing between up or down
  参与人1选择上或下
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  and Player 2 is choosing between left or right.
  而参与人2要选择左或右
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  And this is slightly, slightly cheating because in fact,
  实际上这里面稍微有点小文章
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  Player 1 of course knows what Player 2 is going to have done
  当然与人1行动时她当然知道
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  by the time she moves, but never mind it'll do for now.
  参与人2选的是什么 但这个无所谓
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  Let's just put the payoffs in.
  我们来看一下收益吧
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  So (up, left) is (4, 3)
  (上,左)的收益是(4,3)
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  and (down, left) is (3, 1)
  而(下,左)的收益是(3,1)
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  and (up, right) is (1,2)
  (上,右)收益是(1,2)