A computer can assess in seconds all the permutations and combinations of about 10 to 15 moves ahead, but a top champion chess player, given time, may be able to intuitively envisage up to 20 moves or more.

• 计算机能够在数秒内评估所有的排列及以后10至15步棋的组合，而一位高水平的国际象棋冠军选手在时间允许的情况下可以凭直觉预见到随后的二十步棋甚至更多。