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Poisson model rates Portsmouth at 46%, yet other data sources diverge — this Portsmouth vs Charlton fixture contains genuine analytical tension.

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Analysis

Charlton make the trip to Fratton Park to face Portsmouth in Championship, Regular Season - 24. The match kicks off on Monday 29 December 2025 at 19:45 UTC.

Current Form

Portsmouth's overall Championship record this term: 2W 3D 5L from 10 games (0.90 PPG). Last five: L L W D D. They are averaging 0.90 goals per game and conceding 1.60 — a modest attacking output that tempers optimism on the Over 2.5 market. 1 clean sheet from 10 outings provides some defensive foundation. This season is still relatively young for Portsmouth, so this record blends games from this season and last.

In front of their own supporters this season, Portsmouth have posted 3W 3D 4L at Fratton Park — 1.20 PPG. At home they are averaging 1.00 goals scored and 1.10 conceded per game.

Charlton (all games): 2W 2D 6L across 10 Championship outings this term — 0.80 points per game. Last five: L L D W L. Their scoring rate of 0.70 per game is modest, conceding 1.70 — 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. This season is still relatively young for Charlton, so this record blends games from this season and last.

Charlton's form when playing away from home: 2W 3D 5L across 10 road games this term (0.90 PPG). Away from home they average 0.80 goals scored and 1.30 conceded per game.

Both sides are running at similar form levels — 0.90 PPG for Portsmouth against 0.80 for Charlton. There is no clear form edge to exploit here; other signals need to take the lead.

H2H Analysis

Across the last 6 meetings, Charlton have the stronger historical record — 3 wins to Portsmouth's 0, with 3 draws in the mix.

Attacking output has been a hallmark of this fixture. At 3.0 goals per game across 6 meetings, the Over 2.5 has a statistically grounded case from the head-to-head record alone. The most recent clash, on 24 Feb 2024, ended 0–0 with a draw.

The H2H provides genuine backing for the away side. Charlton have won 3 of 6 previous encounters, and at 3.0 goals per game, the goals market also points upward. The away win and Over 2.5 combination has a historical case worth noting.

Trading

Portsmouth half-time and goal-timing data (68 games, 35 at home): they score before half-time in 71% of fixtures in home games; when goalless at HT, a second-half goal follows 67% of the time; BTTS occurs in 51% of their matches (home games); Over 2.5 goals lands in 51% of games (home games); they fail to score in 32% of games.

Charlton half-time and goal-timing data (68 games, 35 at away): they score before half-time in 49% of fixtures in away games; when goalless at HT, a second-half goal follows 81% of the time; BTTS occurs in 37% of their matches (away games); Over 2.5 goals lands in 46% of games (away games).

BTTS rates are mixed from the trading data — Portsmouth 54% versus Charlton 44%; no strong lean in either direction. The over/under 2.5 picture is inconclusive from the in-play data (Portsmouth 54% | Charlton 47%).

Poisson Model

The Poisson distribution model projects Portsmouth 1.23 xG and Charlton 0.78 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: Portsmouth attack 0.870 / defence 0.960 | Charlton attack 0.704 / defence 1.018. League average goals — home 1.386 / away 1.159. Data: 68 Portsmouth games / 22 Charlton games used (CurrentSeason).

Result probabilities: Portsmouth 46% | Draw 32% | Charlton 23%. Fair-value odds: Portsmouth 2.17 | Draw 3.12 | Charlton 4.35. Portsmouth hold a narrow Poisson edge at 46% — the draw (32%) is close enough to merit draw-inclusive market consideration.

Goals markets: Over 2.5 probability 33% | BTTS probability 39% | Total xG 2.01. Under 2.5 is the strongly backed market at 67% probability — total xG of 2.01 sits well below the 2.5 threshold. The model is projecting a tight, low-scoring match based on both sides' defensive quality. BTTS probability of 39% 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 Portsmouth at 46% — moderate model lean. Draw probability of 32% warrants consideration of Double Chance or Draw No Bet on Portsmouth if the outright odds are short.

On the goals line, Poisson's 2.01 combined xG gives a 33% probability to Under 2.5 — marginal — conflicting signals, supported by form averaging 2.1 goals per game — though H2H averaging only 3.0 goals per meeting points in the other direction.

The Poisson model's BTTS call is No at 39%. Form rates corroborate: Portsmouth 50% | Charlton 40% BTTS from recent games.

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