Lol how much do you even know about chess or computer programming? grandmasters train for their entire lives, some starting at the age of six or younger, to get where they are. They use all the conveniences of modern technology and modern life to help them train as well as building upon and studying the experience and works of thousands of chess players of the past some of whom spent significant portions of their lives writting books on the topic that can be studied today over the course of a few short weeks.
For all these reasons the grandmasters of today are without a doubt among the most superior chess players of all time, yet the best chess engines of today are orders of magnitude superior to them.
Given all that it should come as no surprise that it is possible to design a computer algorithm capable of telling the difference between moves made by a chess engines and moves made by some random joe like myself that plays maybe 100 games or so a week. The performance gap between the two is barely conceivable.