You will often see efficiency numbers quoted without any explanation of what sits behind them. Two figures dominate the discussion in European basketball: offensive rating and defensive rating, and both are expressed per one hundred possessions. This article walks through what they say and what they leave out.
Offensive and defensive rating
Offensive rating is the number of points a team scores per one hundred possessions, and defensive rating is the number it allows. Subtract one from the other and you get net rating. A positive gap means a team outscores its opponents over a given stretch of play, a negative one means the reverse.
The strength of this approach is that it strips out tempo. A team that plays slowly and wins by ten may be no better than a team that plays quickly and wins by ten, and a rating per possession makes that comparison fairer than a plain points total.
A rating is an average, and averages hide variation. A strong net rating built on a few lopsided wins looks identical on paper to one built on steady results. It also says nothing about who the opponents were, so a run of fixtures against weaker sides can flatter a team’s numbers for weeks.
For readers who like to see these figures on a phone during a game, the Vave Casino Europe app is a useful example of how a compact screen forces a service to choose which numbers come first. A per-possession rating is a sensible choice because it takes a second to read.
Ratings are also sensitive to the level of competition. In a league where teams meet only a limited number of times, some sides face a tougher run of opponents than others. Adjusting for opponent strength is therefore a sensible step before comparing two teams.
When wagers on live betting markets are involved, the speed of updates can blur judgement. A budget and a session length chosen in advance work better than reacting to every new figure.
Ratings describe what a team has done. They support understanding rather than forecasting, and the next game remains open.