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Poisson model rates Derby at 47%, yet other data sources diverge — this Derby vs Portsmouth fixture contains genuine analytical tension.

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Pre-Match Analysis

Derby and Portsmouth meet at Pride Park Stadium in Championship, Regular Season - 21. This fixture gets under way on Friday 13 December 2024 at 20:00 UTC.

Current Form

Derby's overall Championship record this term: 1W 5D 4L from 10 games (0.80 PPG). Last five: D L L L D. They are averaging 0.90 goals per game and conceding 1.30 — a modest attacking output that tempers optimism on the Over 2.5 market. 1 clean sheet from 10 outings provides some defensive foundation. Both teams have scored in 80% of their matches — an extremely high rate that makes BTTS Yes a well-supported standalone angle from their form alone. This season is still relatively young for Derby, so this record blends games from this season and last.

Derby's form when playing at home: 5W 2D 3L across 10 games at Pride Park Stadium this term (1.70 PPG). At home they are averaging 1.50 goals scored and 0.90 conceded per game. 5 clean sheets from 10 home games (50%) — they are an exceptionally hard side to score against at Pride Park Stadium. Their home PPG of 1.70 is noticeably stronger than their overall 0.80 — Derby are significantly better at Pride Park Stadium than their overall form suggests.

Portsmouth have collected 1.30 PPG across 10 Championship outings this season: 3W 4D 3L. Last five: L W D W D. Their scoring rate of 1.30 per game is modest, conceding 1.10 — not a side to back heavily on the Over 2.5 from their form alone. 2 clean sheets from 10 outings suggests some defensive organisation. Both teams have scored in 60% of their games — a noteworthy BTTS rate that supports the Yes market. This season is still relatively young for Portsmouth, so this record blends games from this season and last.

On the road, Portsmouth have gone 2W 4D 4L from 10 away fixtures this term (1.00 PPG). Away from home they average 1.40 goals scored and 2.00 conceded per game. Both teams have scored in 70% of their away matches — a high BTTS rate on the road that directly informs this fixture.

The travelling side arrive in better shape. Portsmouth are 0.50 PPG clear of Derby in recent Championship fixtures (1.30 vs 0.80). Backing the visitors outright or on Draw No Bet are both valid approaches where the price allows.

H2H Analysis

The head-to-head record is closely matched — Derby lead 0W to 0W over the last 4 encounters, with 4 draws, though neither side has established a commanding advantage.

The 4 previous meetings have averaged 2.0 goals per game — a neutral rate that provides no strong lean on the goals market from the H2H alone. The most recent clash, on 2 Apr 2024, ended 2–2 with a draw.

The head-to-head offers no strong directional steer in either the result or goals markets. Form, the predictive model and current market pricing should carry more weight than the historical record for this fixture.

Trading

Derby half-time and goal-timing data (64 games, 31 at home): they score before half-time in 64% of fixtures in home games; when goalless at HT, a second-half goal follows 81% of the time; two or more arrive in the second half on 52% of those occasions; BTTS occurs in 52% of their matches (home games); Over 2.5 goals lands in 52% of games (home games); they keep a clean sheet 41% of the time.

Portsmouth half-time and goal-timing data (64 games, 31 at away): they score before half-time in 58% of fixtures in away games; when goalless at HT, a second-half goal follows 57% of the time; BTTS occurs in 52% of their matches (away games); Over 2.5 goals lands in 48% of games (away games).

BTTS rates are mixed from the trading data — Derby 50% versus Portsmouth 56%; no strong lean in either direction. The over/under 2.5 picture is inconclusive from the in-play data (Derby 48% | Portsmouth 58%).

Poisson Model

The Poisson distribution model projects Derby 1.67 xG and Portsmouth 1.20 xG. These expected goals figures are the primary input: they feed a goal-probability matrix across all scoreline combinations to derive the result and market probabilities below. Underlying strength ratings: Derby attack 0.894 / defence 1.207 | Portsmouth attack 0.970 / defence 1.408. League average goals — home 1.330 / away 1.025. Portsmouth bring a strong defensive rating of 1.408 — this is suppressing Derby's projected output below what their attack strength alone would suggest. Data: 20 Derby games / 18 Portsmouth games used (CurrentSeason).

Result probabilities: Derby 47% | Draw 27% | Portsmouth 26%. Fair-value odds: Derby 2.13 | Draw 3.70 | Portsmouth 3.85. Derby hold a narrow Poisson edge at 47% — the draw (27%) is close enough to merit draw-inclusive market consideration.

Goals markets: Over 2.5 probability 55% | BTTS probability 58% | Total xG 2.87. Over 2.5 holds a meaningful probability edge at 55% — the 2.87 total xG provides moderate support, though the model is not projecting a high-scoring game. BTTS probability of 58% is moderate — neither team is projected to score with enough certainty to make Yes a clear standalone call.

Verdict

The Poisson model's primary lean is Derby at 47% — moderate model lean. Note a divergence: in-form Portsmouth (1.30 PPG) cuts against the Poisson lean — consider the strength-adjusted model over surface-level form results. Draw probability of 27% warrants consideration of Double Chance or Draw No Bet on Derby if the outright odds are short.

On the goals line, Poisson's 2.87 combined xG gives a 55% probability to Over 2.5 — reasonable, supported by form averaging 2.9 goals per game.

The Poisson model's BTTS call is Yes at 58%. Form rates corroborate: Derby 50% | Portsmouth 70% BTTS from recent games.

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