来自《耶鲁大学开放课程：博弈论 第9集 第9集》

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  So sometimes you're successfully going to hit it past Serena
  有时你成功把球达到了塞丽娜的一侧
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  but the ball is going to sail out.
  但球却出界了
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  So that happens 10% of the time here
  这种情况下出界的概率是10%
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  and 20% of the time here.
  而这里出界概率是20%
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  Look at the other two boxes,
  再来看下另外两个单元格
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  if Venus hits to Serena's left and Serena guesses left,
  如果维纳斯和塞丽娜都选择了左
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  then we're going to assume that Serena's going to reach the ball
  那么我们假设塞丽娜接到了球
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  and make a volley,
  并且会打出一个截击
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  but her volley only manages to go in,
  但是她的截击只有一半的概率
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  go over the net and go in half the time,
  能够过网得分
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  so the payoffs are 50, 50.
  因此收益是50, 50
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  Half the time Venus wins the point
  维纳斯有一半的概率得分