Feature Request: Filter Out Correspondence Games in the Masters Database

Hi Lichess team,

Could you please add an option to exclude correspondence games from the Masters database in the opening explorer?

When researching openings for over-the-board play, I’d find it incredibly helpful to view game statistics and opening choices without correspondence games included. Correspondence chess allows different time constraints and access to resources and in a lot of cases engines, so separating these games would make the database more useful for this purpose.

A simple “Exclude correspondence games” checkbox would be greatly appreciated.

Thank you for considering this request and for all the work you put into Lichess!

Best,
DarthVaderRocks

Hi Lichess team, Could you please add an option to exclude correspondence games from the Masters database in the opening explorer? When researching openings for over-the-board play, I’d find it incredibly helpful to view game statistics and opening choices without correspondence games included. Correspondence chess allows different time constraints and access to resources and in a lot of cases engines, so separating these games would make the database more useful for this purpose. A simple “Exclude correspondence games” checkbox would be greatly appreciated. Thank you for considering this request and for all the work you put into Lichess! Best, DarthVaderRocks

tpr

It would be more useful to exclude bullet, blitz, and rapid games. Those are high quantity, low quality and distort statistics.

DarthVaderRocks

@tpr said ^

It would be more useful to exclude bullet, blitz, and rapid games. Those are high quantity, low quality and distort statistics.

We can already do that for the main lichess database (the one with 4.6 billion games). The master's database is mostly filled with classical and correspondence games, but I agree, it would be nice to have all the same functionality for the master's one as well

@tpr said [^](/forum/redirect/post/MsdnGr6N) > It would be more useful to exclude bullet, blitz, and rapid games. Those are high quantity, low quality and distort statistics. We can already do that for the main lichess database (the one with 4.6 billion games). The master's database is mostly filled with classical and correspondence games, but I agree, it would be nice to have all the same functionality for the master's one as well

IM zwenna

Are there any actual correspondence games in the Masters Database? I do not recall ever having seen one, although most games are labeled as "correspondence" for some reason.

tpr edited

"Are there any actual correspondence games"

Yes, there are.
You can recognize them by the label ICCF under the share and export tab, and also by the flat engine evaluation without any errors.
Example:
https://lichess.org/3XdR5SQK#32

"Are there any actual correspondence games" * Yes, there are. You can recognize them by the label ICCF under the share and export tab, and also by the flat engine evaluation without any errors. Example: https://lichess.org/3XdR5SQK#32

GM ILikeBlitz

@zwenna said ^

Are there any actual correspondence games in the Masters Database? I do not recall ever having seen one, although most games are labeled as "correspondence" for some reason.

There are many corr. games in the Masters database, and some subvariations are mostly played by corr. players. When I get in the Masters tree (database) to a single game, names and ratings appear. For players above 2300 I am able to guess correctly in more than 90 per cent of cases whether it was a correspondence game or not, without looking to any database, just because I know lower thousands of names of OTB players and lower decades of names of corr. players. (Two unknown high-rated players typically mean a correspondence game.) It means that I often know which moves are reasonable (not necessarily the best, even very bad in rare cases), without violating any rule and without going beyond the Masters database.

@zwenna said [^](/forum/redirect/post/nksU8zRk) > Are there any actual correspondence games in the Masters Database? I do not recall ever having seen one, although most games are labeled as "correspondence" for some reason. There are many corr. games in the Masters database, and some subvariations are mostly played by corr. players. When I get in the Masters tree (database) to a single game, names and ratings appear. For players above 2300 I am able to guess correctly in more than 90 per cent of cases whether it was a correspondence game or not, without looking to any database, just because I know lower thousands of names of OTB players and lower decades of names of corr. players. (Two unknown high-rated players typically mean a correspondence game.) It means that I often know which moves are reasonable (not necessarily the best, even very bad in rare cases), without violating any rule and without going beyond the Masters database.