I believe you're thinking of this post by Terry Tao: https://terrytao.wordpress.com/2016/06/01/how-to-assign-partial-credit-on-an-exam-of-true-false-questions/

I believe you're thinking of this post by Terry Tao: https://terrytao.wordpress.com/2016/06/01/how-to-assign-partial-credit-on-an-exam-of-true-false-questions/ https://terrytao.wordpress.com/2016/06/01/how-to-assign-part...