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Dragon ranks and ratings
- Does the board size impact the ratings?
Yes. 19x19 games have the biggest impact on ratings. The 19x19 goban serves as anchor for the impact on the rating. So a factor of 100% is used on the rating differences when new ratings are calculated. Games on larger boards have a smaller impact, as the 19x19 sized goban is the anchor. A 25x25 game therefore uses a size factor of 47% of the full rating difference. Two 13x13 games account as about one 19x19 game. The precise value is about using a size factor of 47%. Two 9x9 games account as about one 13x13 game. The precise value is about using a size factor of 22%. The exact formula to calculate the impact factor is: ( 19 - |size-19| )^2 / 19^2
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