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    Explaining level changes

    Yashwant Gurbani v Graham Staples (Sat 19 Nov 2022)

    Match won by Yashwant Gurbani. Result: 6-1.

    Starting level for Yashwant Gurbani: 710, level confidence: 55%.
    Starting level for Graham Staples: 1,114, level confidence: 20%.
    Graham Staples to win as he is currently playing 57% better than Yashwant Gurbani.

    Yashwant Gurbani won 86% of the points.

    Assuming that any level changes are shared between both players, for this result it looks like Yashwant Gurbani actually played at a level of 1,266 and Graham Staples at a level of 625. Without any damping, both players would need to be adjusted by 78% to match this result.

    Allowing for the difference in level between the players, the adjustments have been reduced to 59% and 37% respectively.
    As this is a best of 1 match rather than best of 5, these adjustments have been reduced to 45% and 31% respectively.

    Factoring in the relative levels of confidence which allows players with low confidence in their levels to change more quickly, the adjustment for Yashwant Gurbani changes to +17% and Graham Staples changes to -31%.

    After applying standard match damping, the adjustment for Yashwant Gurbani becomes +9.6% and for Graham Staples becomes -18%.

    Apply match/event weighting of 50% for 'Redland Boxes' so the adjustment for Yashwant Gurbani is +4.8% and for Graham Staples is -8.8%.

    Apply limits to the amount of change for a single match so that Graham Staples is limited to -8% level change. In general a player's level won't go up by more than 10% or drop more than 5% if they've played in the last 7 days but those limits are relaxed if their previous match was further back.

    Increase level confidence due to one more match played. Yashwant Gurbani: 74%, Graham Staples: 45%. Reduce level confidence based on how unexpected the result is. Yashwant Gurbani: 42%, Graham Staples: 25%.

    Final level for Yashwant Gurbani: 744, level confidence: 42%.
    Final level for Graham Staples: 1,025, level confidence: 25%.

    Notes

    • This calculation is done in two main parts; first work out the adjustment needed to match the results and then apply damping. This means that levels should always be 'about right' but the time taken to get there or the volatility is dependent on the damping.
    • A level also has 'level confidence' which drops if players haven't played for a long time or have had enexpected results. As low confidence levels adjust more quickly than high confidence levels, it allows these players to find their level more quickly without impacting their opponent's level too much.
    • Point scores are used as well as game scores for accuracy - particularly important for 3-0 results - though we can work with game scores only too, albeit with more damping.
    • Mismatched players are allowed for - you don't have to hammer your opponent. See explanation above if this applies to this match.
    • The section on damping is where we still have some options. We have recently made a change to damp league matches more than tournament matches and box matches even more than that. This gives added weight to the more important matches.
    • There are occasional, very small adjustments made to all players to keep the averages constant which are not covered here.
    • You don't get a bonus just for winning - if you want to go up you have to play better than expected against your opponent.
    • We have spent more than 5 years fine tuning the level calculations based on tens of thousands of match results and a great deal of feedback from players, team captains and coaches. It's the most usable and accurate ranking system there is in any sport, let alone squash.
    • For a more complete explanation of how levels are calculated (on which this system is based) see the help file here.
    • If you have thoughts/opinions on the above or any feedback on the way levels are calculated or updated, please contact us. We welcome all feedback, although we are keen squash players ourselves and would pefer to be on-court than in front of a screen so please be patient and please do try to see if your question has already been answered on the help page. We are unable to answer questions about hard anyone played in their match - we only get to see the results - and if your level didn't increase as expected please make sure you've looked at the above explanation before contacting us. If you want to go up the levels, train harder, listen to your coach and win more points. Or just be incredibly talented!