The next installment in the series of Starline’s Painstaking OGS Tables!
After a lot of research, and a lot of math, I made this table to find out how your rank will change! Bear in mind that these are AVERAGES. Do not come at me if they are slightly off.
The left column is your opponent’s rank relative to yours, so if you were a 1550, and played a 1580, you’d refer to the 30 in the left column. You guys can fill in the gaps I left here
Rating Difference
Win Rating Change
Loss Rating Change
-300
+8
-40
-270
+9
-38
-240
+10
-37
-210
+11
-35
-180
+13
-33
-150
+15
-32
-120
+16
-30
-90
+18
-28
-60
+20
-26
-30
+22
-24
0
+24
-22
30
+26
-20
60
+28
-18
90
+30
-16
120
+32
-14
150
+34
-13
180
+35
-11
210
+37
-10
240
+39
-8
270
+40
-7
300
+41
-6
If you’re wondering how these translate to kyu ranks, never fear!
Here’s yet another table!
Edits to avoid people attacking me:
This is once you have established a stable rank by playing 15 ranked games.
The 15-game window this system works on leads to some quirks, like if a game you won against a stronger opponent just leaves that window, and is replaced by a win against a weaker opponent, your rank will go down, even if you won, and vice versa for a loss against a weaker opponent.
Yes, yes, I know, stuff about the 15 game window, but NO ONE CARES! I just put in a bunch of placeholder games, where the opponents were all equal strength, and the outcome was a tie.
Sorry if I am just clueless or not understanding the chart, but how much would I move down if I lost to an opponent 900 rating differences above me? That should be my new strategy now playing the people I will barely move down against. All I gotta do is catch them in a tournament or ladder challenge them.
The ranking win change looks linear enough? I guess that it is linear, because it is increasing by one-two-one-two
…
The ranking loss change is probably going to be close to zero, so yeah.
To the extremes, let’s say a 400 Glicko point person https://avavt.github.io/gotstats/#/user/636788
Beat a 3150 Glicko point person (any of the 9 dans) https://online-go.com/player/624668/ (Note: he got affected by the correspondence disconnection bug - look at his rank before that), The 400 point person would (by a linear extension of the Win Rating Change - it might not be linear but it seems that way) gain 200 Glicko points, and the 3150 point person would lose 200, but they would still be a 9d! (Man pros are good)
The default rank of an unranked player is 1150. I don’t remember the exact averages, but I found the average rank is significantly higher than that. Assuming 60% of games are ranked, I found a (small) “compensation number” to add, so everything aligns.
looks up sigmoid function
What is the upper limit? (I know that sigmoid functions map numbers on the number line to a number from 0 to 1 - it is a curve (Side note: In a perfect world, a virus’s ahem COVID-19 ahem total cases would map a sigmoid function, with 0 being the bottom (or 1? It is a virus after all), and the total case number at the end would be the upper bound)). Based on my understanding, the function to derive the rank change would be a multiple of the sigmoid function, right? What is the maximum rank change? Edit: (this is not an edit - I just realized this) obviously the maximum would be double the middle, or 48! That doesn’t match up with your numbers though. Hmm…
playing the people I will barely move down against. All I gotta do is catch them in a tournament or ladder challenge them.
(Man pros are good)