Read more about Play Quality Index
Only players with at least 15 evaluated games have been taken in the ranklist.
: This ranklist and the player quality index method has not been designed to catch/indicate cheating.
The method is not as theoretically solid as for example the one that has been developed by Prof. Keneth Regan
for the FIDE Anti-Cheating commission
. The fact that (over) 15 games have been evaluated and they show high or low similarity to engine choices means nothing as a fact by itself if not put into strict statistical frames and evaluated under the most stable test conditions. Also, even in strict statistical conditions (which is not the case here) the evidence that a player has high similarity to engine play does not mean he is cheating, it could just indicate a more computer like playing style, better home preparation, and so on. Additionally, despite that we have analyzed over 100,000 games on chess-db.com the pool of players that have more than 15 analysed games is not that big: many players with possibly higher QoP index are not yet taken in the ranklist.
Finally, for players with similar ELO rating/strength there is a reasonable variance in QoP index, having engine-like style is often something to be proud of than feel suspicious about it.