来自《耶鲁大学开放课程：博弈论 第9集 第9集》

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  I know that Serena is mixing, so I know these must be equal.
  应该是塞丽娜在混合策略因此二者相等
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  So since they're equal I can solve out
  由于二者是相等的
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  and hope that I've got this right,
  但愿我没有算错
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  so I've got 50P equals 70(1-P),
  我能得到50=70(1-P)
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  so P is equal to 7/12.
  所以P=7/12
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  So again, that's just algebra, I rushed it a bit, it's just algebra.
  这次我快速地解决了算术问题
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  Same idea, just algebra.
  还是简单的代数知识
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  So 7/12 is indeed smaller than what it used to be,
  7/12确实比原先的值要小
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  because it used to be 7/10,
  因为原来的值是7/10
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  so that confirms our result.
  这就印证了之前的猜测
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  So the strategic effect dominated.
  即战略影响占了上风
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  Venus shot to serena's backhand less often,
  维纳斯减少了打塞丽娜反手的概率