Since our rating system is based purely on scores, it does not take into account defaults or walkovers. However, these results are still displayed on the player's profile page along with their other scores. With regards to withdrawals, if a player withdraws either a) before the match starts or b) during the match but before either player wins at least four games, it does not factor into the UTR algorithm. It will, however, be displayed on the player profile. This display will hopefully be a disincentive for the small subset of players who withdraw quite frequently. We are aware of and monitoring junior players abusing the system.