In the Learn>Book Openings what are the "Popularity" numbers based on? Doesn't seem to be the number of games in the DB.

and wins and lost percentage also seem to not be rightly displayed - if you will compare the summary of games displayed after the move chosen and displayed before sometimes it's not correct at all. hope i'm clear with this explanation :) gl

Im also interested in this question. It doesnt appear to be based on views- some openings have comments but 0 popularity. I doubt its based on chess.com games, although that could always be the case...

Good question. "English Opening / Great Snake Variation" is 10x as popular as the Slav/Semi-Slav... of course that's silly. I'm guessing # of page views.

How about an answer from a member of the staff please...........

I found these most played stats at another well known site with a DB of about 500,000 games. So, I am still wondering what our Book Openings "Popularity" numbers mean.........??

1. A04 - Reti Opening (8,125 games played)
2. B22 - Sicilian, Alapin (6,962)
3. B06 - Robatsch (6,621)
4. B90 - Sicilian, Najdorf (5,841)
5. A07 - King's Indian Attack (5,676)
6. A46 - Queen's Pawn Game (5,674)
7. A15 - English (5,254)
8. B40 - Sicilian Kan (5,223)
9. A45 - Queen's Pawn Game (4,500)
10. B01 - Scandinavian (4,436)
11. B33 - Sicilian (4,377)
12. B07 - Pirc (4,347)
13. E12 - Queen's Indian (4,327)
14. D02 - Queen's Pawn Game (4,312)
15. B23 - Sicilian, Closed (4,229)
16. A00 - Uncommon Opening (4,175)
17. C42 - Petrov Defense (4,164)
18. E15 - Queen's Indian (4,078)
19. B30 - Sicilian (4,060)
20. D37 - Queen's Gambit Declined (3,871)