About this data, I’m not very convinced.
- The total count of games doesn’t match: the tables for overall rating have more games in all handicaps. As far as I understand, the same games should be used for predicting with overall rating vs rating for different sizes/speeds.
- Even if this data is correct and the overall rating works well for a majority of players, that doesn’t rule out that there is a problem with an specific type of players which is significantly stronger in some specific size/speed. ¿Does this type of player exist in reality or not? That’s what we should investigate. If it exists, maybe the solution would be to let the player decide if the system should use their overall or specific rating.