An extension of the standard xT model that adds two critical components: (1) a turnover penalty — when a player loses the ball, they lose all the xT their team had built up PLUS the opponent gains xT from the recovery location (computed as the 180° pitch rotation of the loss zone), and (2) a defensive risk term — the inherent risk of moving the ball in your own half, computed as P(losing ball) × opponent's xT from recovery position. This produces a pitch map where holding the ball deep in your own half shows NEGATIVE xT — confirming the intuition that passing across your own penalty area is dangerous — while standard xT shows those passes as neutral.
Modify the xT per-action calculation in two cases:
For turnovers (lost possession):
Action xT = -(starting zone xT) - xT(opponent recovery zone)
Where opponent recovery zone = 180° rotation of the loss location (because the opponent builds out from there).
A turnover in the opponent's half is mildly negative (opponent starts deep). A turnover in your own half is extremely negative (opponent starts near your goal).
For the movement term (risk adjustment):
Movement value = P(move XY→ZW) × xT(ZW) - P(lose ball during move) × xT(opponent recovery zone AB)
This means every pass and carry now has both a reward component (threat generated if successful) and a risk component (threat conceded if the ball is lost).
For shot-taking:
Shot xT = shot xG - zone xT
This measures how well the player maximized their shooting opportunity given their position. A player who finds space and opens a clear angle generates more shot xT than one who shoots through traffic from the same zone.
Standard xT assigns near-zero to lateral passes across your penalty area. Risk-adjusted xT makes these strongly negative — correctly reflecting extreme danger if intercepted.