4 ms·
Lichess doesn't use ELO rating but a different rating system. And yes, I don't understand that difference either. About white versus black, there is some conse
by mpol 4y ago
Lichess doesn't use ELO rating but a different rating system. And yes, I don't understand that difference either.
About white versus black, there is some consensus that after about 20 moves, white's advantage is gone. I doubt that statement is supported by statistics. I guess the rating just assumes everyone plays white and black just as often, so it will even out in the end. (edit) By the way, if you are strong with white and weak with black, how should your ELO rating be calculated? It is only one number, not two. Assuming an average seems fine with me.
And the way a win is made, those are for the beauty contests :)
A simple calculation for ELO is just to see it as both players placing a bet, the K factor is the amount of points in the jar. If the K factor is 25, you have 1600 ELO and I have 1400 ELO, you might put in the jar 16 points, while I put in 9 points. Winner takes the jar, on a draw it is plit in half. Difference between win and draw is always half the K factor. When both players have a different K factor, the calculation for both players will be different, it's not zero sum.
- sgjohnson 4y ago> About white versus black, there is some consensus that after about 20 moves, white's advantage is gone. I doubt that statement is supported by statistics. That statement is supported by statistics, however, the problem with that statement is that the average chess game is 25 moves. except in top-level classical play. But it's not relevant, because virtually all experts agree that chess is a theoretical draw. It's extremely difficult to prove it, however.
- tialaramex 4y agoI wonder if there's even a way to be sure of a minimum length? Like suppose I'm White, I know how to play Chess perfectly and so does my opponent. So (if the popular assumption is correct) we will eventually draw, but how many moves can I draw the game out for, assuming my opponent isn't willing to concede, but is trying to shorten the game ?
- sgjohnson 4y ago> but how many moves can I draw the game out for depends on the position, from not a lot, to 100+ moves. but don't forget that there are forced draws in chess, namely, repeated position 3 times (doesn't have to be consecutive), 50 move rule (50 moves without a pawn move or a capture), and insufficient material. So trading off material would shorten the game.
- narag 4y agoLichess doesn't use ELO rating but a different rating system. That explains some odditites I've observed, like different strength with the same rating at different hours of the day or different days.
- xtracto 4y agoYes!!! I've long been frustrated by this. I'm around 1800 if I play at certain times, but quickly get down to 1700 when playing at others. For some reason 1700s are stronger during night.
- narag 4y agoAnd something even worse: sometimes it seems that lower rated players are consistently stronger, so if you fall below some threshold, you get stuck there. On the other hand, if you can get above it, you suddenly win and win...
- rgoulter 4y agoLichess' page on rating systems: https://lichess.org/page/rating-systems https://lichess.org/page/rating-systems
- bitshiftfaced 4y agoThey say that Glicko 2 is more accurate than Glicko 1, and they reference a kaggle leaderboard. On that private leaderboard, I only see "Glicko benchmark" and "Real Glicko," so I don't see how they made that claim. I find it dubious that Glicko 2 would be more accurate out of sample.