A Rating Calculation Question
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ckonkle
Mar 15, 2019
0
#1
I know that a draw against a player rated higher or lower than you will effect your rating accordingly, but does the type of draw impact the points calculated for that game? For instance are the points calculated differently for a game in which you accepted an opponent’s offer of a draw than for a game in which you force a three move repetition? Are all draws calculated the same way?
Mar 15, 2019
0
#2
All draws (and all wins for that matter) are calculated the same way.
Drawing a higher rated player will win just as many points as drawing the same player any other way (agreement, 50 moves, stalemate, etc)
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The rating formula's goal is to predict future results based on past results. Given any two ratings, what the rating formula does is produce a statistic. Not for 1 game, for for an arbitrarily large number of games. For example if there is a 100 point rating difference, then the higher rated player is expected to score about 64%. So over 100 games they're expected to score about 64. Over a million they're expected to score about 640000.
When the expectations don't meet reality, the rating is adjusted up or down accordingly so that it will be more accurate in the future. That's the main idea.