The Championship's mid-table and relegation battlers meet at The Valley on Saturday, with 18th-placed Charlton hosting 12th-placed Birmingham in a fixture that has historically been a graveyard for goal-hunters. With both sides showing declining form trends and a remarkable head-to-head record for low-scoring affairs, the value lies firmly in the unders market. Charlton's season has been a struggle, sitting just three points clear of the drop zone with 41 points from 35 games. Their home form is particularly alarming for supporters, managing just 0.67 goals per game in their last six at The Valley with a win rate of only 33.33%. Recent results paint a picture of a side that battles hard but lacks cutting edge: they've drawn three of their last ten, including hard-fought 1-1 stalemates against promotion-chasing Southampton (who boast 1.80 points per game) and West Brom. Their 1-0 victory over Sheffield United and 2-0 away win at Leicester show they can grind results, but the 4-0 home drubbing by Millwall and 1-3 reverse against Portsmouth expose defensive frailties against organised attacks. Birmingham arrive in significantly better shape overall with 49 points, but their recent trajectory is concerning. Back-to-back defeats against Middlesbrough (3-1) and Millwall (3-0) saw them concede six goals in two games, a stark contrast to their previously solid away record. However, prior to those setbacks, they had won 60% of their last five away fixtures, scoring 1.40 per game while conceding just 1.00. Their 2-1 victory at Norwich (who are flying high with 2.40 points per game recently) demonstrates their capability against strong opposition, though they've become increasingly draw-prone with four stalemates in their last ten. The head-to-head record is the most compelling argument for this selection. Of the last nine meetings between these sides, eight have finished under 2.5 goals - an astonishing 89% unders trend. The most recent encounter in December 2025 finished 1-1, continuing the pattern of tight, tactical battles. Charlton's home record against Birmingham is split evenly at 2-2, suggesting neither side dominates this fixture. From a statistical perspective, the goal expectancies support a low-scoring affair. The Poisson inputs suggest just 0.83 goals for Charlton and 1.20 for Birmingham, giving a combined expectancy of 2.03 total goals. Charlton have kept four clean sheets in their last ten (40%), while Birmingham have managed three (30%). The Addicks' shot data reveals their struggles - despite averaging 13.17 shots at home, their conversion is poor with only 0.67 goals per game, suggesting poor shot quality or finishing difficulties (supported by their -0.21 finishing delta). **Key Points:** - 8 of the last 9 H2H meetings have finished under 2.5 goals (89% trend) - Charlton averaging just 0.67 goals per game at home in their last six fixtures - Poisson goal expectancies suggest only 2.03 total goals expected (0.83 vs 1.20) - Charlton have kept clean sheets in 40% of their last 10 games - Birmingham's away games average just 2.40 total goals (1.40 scored, 1.00 conceded) - Both teams show declining points trends, suggesting conservative approaches may prevail With the historical dominance of unders in this fixture, Charlton's chronic lack of home goals, and the mathematical goal expectancies all pointing in the same direction, the 1.73 available on under 2.5 goals represents excellent value. Birmingham's recent defensive wobbles are concerning, but Charlton's inability to convert possession into chances at home (46.6% average possession but only 0.80 goals per game) suggests another tight encounter is on the cards.