Portsmouth FC scores shown first. Bivariate Poisson with team xG from recent form — most-likely score ≠ most-likely winner.
Probabilities derived from a Poisson model on expected goals. Edge % shown only when the book posts both sides of a market.
Joint probability comes from the score grid (the truth). Naïve is what a book gets by multiplying legs — they undershoot correlated positive legs like "home + BTTS" and overshoot anti-correlated ones like "draw + over 2.5". Buy positive correlation; avoid negative.
Model probabilities Portsmouth FC 51.4% · Draw 23.7% · Millwall FC 24.9% Why Portsmouth FC is favoured Portsmouth FC's Elo (1482) is +25 over Millwall FC (1457); low confidence. Recent: Portsmouth FC 4W-3D-3L · Millwall FC 3W-3D-4L (last 10). Goal differential per game: Portsmouth FC +0.2, Millwall FC -0.2. Form depth Portsmouth FC: avg 1.3 goals scored, 1.1 conceded per game (2/4 at home, 2/6 on the road). Millwall FC: avg 1.6 goals scored, 1.8 conceded per game (2/6 at home, 1/4 on the road). Goals expectation Model expects ~2.9 total goals (Portsmouth FC 1.6, Millwall FC 1.4) — above the 2.5-goal mid line. But — counter-arguments Elo confidence is low (15%) — ratings are based on a thin sample, so the prediction itself is wider than the headline number suggests. Head-to-head 1 prior meetings — Portsmouth FC 0W, 1D, Millwall FC 0W (draws are common). Last 3: 1-3, 3-1, 2-1. Confidence note Elo data on these teams is thin (15% sample-size confidence); headline number is sharper than the underlying signal — treat it as directional, not absolute.