gen-define-the-value-of-a-possession-and-give-one-short-worked-e-7fcb

Define the value of a possession and give one short worked example.

# Value of a Possession **Definition:** The value of a possession in soccer is the **expected goals (xG) generated during that possession** minus the **xG conceded if possession is lost**. Mathematically: **Possession Value = xG created - xG conceded upon turnover** This captures both the attacking opportunity and the risk of losing the ball. --- ## Worked Example **Scenario:** A team wins the ball at midfield and has two options: **Option A:** Pass backward to the defender (safe) - Probability of maintaining possession: 95% - Expected xG if retained: 0.05 - xG conceded if lost in defensive third: 0.40 - **Value = 0.95(0.05) + 0.05(-0.40) = 0.0475 - 0.02 = +0.028** **Option B:** Attempt through-ball to striker (risky) - Probability of success: 40% - xG if successful: 0.30 - xG conceded if intercepted: 0.15 - **Value = 0.40(0.30) + 0.60(-0.15) = 0.12 - 0.09 = +0.030** **Decision:** Option B has slightly higher value (+0.030 vs +0.028), so the aggressive pass is marginally better despite the risk.