What would be the rating of a random move generator? • page 1/1 • General Chess Discussion • lichess.org

I had this curiosity.

Suppose a player (or a bot) randomly chooses one of their legal moves at every turn.
What would be the rating of such player?

100? 200?

Are there lichess bots that do just that?

I had this curiosity. Suppose a player (or a bot) randomly chooses one of their legal moves at every turn. What would be the rating of such player? 100? 200? Are there lichess bots that do just that?

mcgoves

#2

There are bots that do that, but they can only play unrated games, because making random moves violates the terms of service.

norla

#3

With the ELO system there is a formula for the expected win rate when the difference in ELO score has a certain value. I'm not 100% sure we can use the same for glicko2 but let's do it anyway and hope for the best So we can ask ourselves, how likely is a randomly moving bot to beat a player rated say 1000 and then we can find the appropriate difference.

I personally think the 1000 player has likely >99.99% chance of winning unless they are throwing. This would give a rating difference of about 1600, so it should have ELO -600. However since lichess has put a minimum rating floor of 400 that would be where it ended up.

With the ELO system there is a formula for the expected win rate when the difference in ELO score has a certain value. I'm not 100% sure we can use the same for glicko2 but let's do it anyway and hope for the best So we can ask ourselves, how likely is a randomly moving bot to beat a player rated say 1000 and then we can find the appropriate difference. I personally think the 1000 player has likely >99.99% chance of winning unless they are throwing. This would give a rating difference of about 1600, so it should have ELO -600. However since lichess has put a minimum rating floor of 400 that would be where it ended up.