来自《耶鲁大学开放课程：博弈论 第9集 第9集》

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  Why isn't it 100% here? Somebody? Patrick?
  为何不是100% 帕特里克你说一下
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  Wait for the mike.
  请把麦克递给他
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  Sometimes she hits it out of bounds when she serves.
  因为有时她也可能把球发到界外
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  Right, this isn't even a serve,
  好的 这不是在发球
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  this is a passing shot but the same is true.
  这是打穿越球 但道理是一样的
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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