Does anyone know how ongoing games in lichess are implemented with MongoDb? Does the server read all the moves from the database to do 3 move repetition detection? How is the current position of a game encoded in the database?
Lucky you, I wrote about all that recently, here's the paper: github.com/ornicar/lila/blob/master/mongodb.md
Could you elaborate how the position is encoded in the database? Your linke gave an example game object gist.github.com/3886230 but I don't see anything that stands out as the position.
Well at a glance I didn't see what the labels correspond to, but apparently he's using hashes like MD5 for positional factors, or security stamps using encryption on those too.
When I was not using any sort of encryption my binary storage was 64 bytes per position, easily taken down to 4 bits per square = 32 bytes if you only need Forsyth notation representation. I dunno anything about encryption though but I guess it's smaller. :)
jesus christ, lol at this captcha
- - - k - - - -
- - - - - - - P
- K P - P P P -
P P - B - - - -
- - - - - - - -
- - - - - - - -
- - - - - - - -
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The shit people do on this site in their games. :D
When I was not using any sort of encryption my binary storage was 64 bytes per position, easily taken down to 4 bits per square = 32 bytes if you only need Forsyth notation representation. I dunno anything about encryption though but I guess it's smaller. :)
jesus christ, lol at this captcha
- - - k - - - -
- - - - - - - P
- K P - P P P -
P P - B - - - -
- - - - - - - -
- - - - - - - -
- - - - - - - -
- - - - - - - -
The shit people do on this site in their games. :D
#2
The link is broken. Could you send a new link?
The link is broken. Could you send a new link?
Note that the mongodb paper hasn't been updated in 2 years. It's vastly outdated now.
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