In the 2025-26 season, the Champions League quarter-finals have taken on a new meaning: now, not only football traditions but also precise calculations determine who comes closest to the final. The Elo system, originally from chess, makes it possible to assess the true strength of each club, taking into account not only their victories but also the quality of their opponents. This approach changes our perception of favorites and underdogs, as even a significant rating advantage does not guarantee an easy win.
Unlike the usual tables where titles and points matter most, the Elo factor tracks dynamics: a win over a strong opponent earns more points, while losing to a weaker team notably lowers the rating. This makes the model especially valuable for analyzing current team form. According to MARCA, when calculating the odds of reaching the semi-finals, not only were the ratings at the time of the draw considered, but also the home field factor, which adds 65 points to the host team’s score. This detail can shift the balance of power even in the most evenly matched pairings.
Math versus emotion
Each match accounts for the probability of a draw—about 27% according to Champions League statistics. This is important, as draws often play a decisive role in two-legged ties. The overall probability of reaching the next round is calculated based on all possible scenarios, including extra time and penalties, where the odds are considered 50-50. This approach highlights not only clear favorites but also the hidden risks for strong clubs.
The most evenly matched pair is PSG versus Liverpool. The French club is given a 54% chance of advancing, but the margin is minimal. Both teams are stronger at home, and a single mistake could determine the outcome. Unexpected twists are possible here, as even a slight Elo advantage does not make the tie a formality.
Bayern and Munich
In the clash between Bayern and Real Madrid, the Germans have the advantage—55.5% to 44.5%. The key factor is the return leg in Munich, where the hosts traditionally play with greater confidence. According to russpain.com, it is the home game that could tip the balance, despite the close ratings. Still, Real Madrid’s experience in these situations has often led to surprise outcomes, and the details may prove decisive here.
Last season, as MARCA notes, Bayern already faced a situation where the outcome was decided in the final minutes. Such scenarios are not uncommon in the Champions League, where even favorites can end up chasing the result. In this context, it is worth recalling how the club concealed details about the condition of its key players ahead of crucial matches— details on Bayern’s preparations for the match with Real Madrid had already raised questions among fans and experts.
Spanish derby and a clear favorite
In the Spanish derby between Barcelona and Atlético de Madrid, the gap is more pronounced: the Catalans have a 62.1% chance of advancing. The Elo model makes them favorites even as the away team, which is rare for a matchup at this level. Atlético, despite their reputation as seasoned cup fighters, lag behind in all key metrics. Here, home advantage is not enough to bridge the class gap, and only unconventional decisions could change the course of this series.
The most clear-cut pairing is Arsenal versus Sporting CP. The English side has a 73.1% chance of progressing, and away from home their probability of victory is nearly double that of their opponents. In London, the gap widens even further: 59.7% versus 13.3%. This disparity is explained not only by differences in ratings but also by Arsenal’s squad consistency, as this season they are showing confident performances across all areas of the pitch.
Where an upset is possible
Despite the statistical forecasts, the Champions League always leaves room for surprises. Even with a clear Elo advantage, no club can be certain of an easy path forward. The history of the tournament is full of instances where underdogs knocked out favorites, and decisive goals were scored in stoppage time. This season, two ties — PSG-Liverpool and Bayern-Real Madrid — promise maximum intrigue, with every moment carrying the potential to decide the outcome.
Overall, the Elo system allows fans to look at football without emotion, but reality often makes its own adjustments. For supporters, it’s a chance to see not only a clash of tactics but also different approaches to game analysis. Ahead are matches where numbers and passion will battle for the right to determine the strongest side.
The Elo system is a mathematical tool that measures the strength of football teams based on their results and the level of their opponents. Unlike traditional rankings, it values not just a win, but also the context: who the opponent was, where the match took place, and how significant the result was. This approach allows for more accurate match predictions, but it does not eliminate the human factor or the unpredictability of football. In recent years, Elo has been actively used by analysts, clubs, and even international organizations to assess teams’ current form and outlook for tournaments.
