pookpooi wrote:If you lower the Elo of Iyama Yuta, it might reflect a better prediction for game against Korean/Chinese pro (which he rarely play) and worse prediction for domestic game (which he'll play a lot)
I agree. It would almost make sense to calculate rating in a different way, depending on the page you are viewing. The ranking/results you are aggregating should reflect the dataset it was calculated from.
I also agree that the model can have good prediction, given that the dataset Remi uses is representative (and continues to be representative) of all of the games that pros play. If the dataset doesn't include all games we know about, it could be skewed.