Not every Primera División match is the same. Some finish with 8 cards and 30 fouls; others barely produce 2 yellows. The difference is not random: there are measurable factors that let you anticipate, with fair accuracy, the level of friction in a match before it starts. This guide explains what those factors are and how Silbato Pro combines them.
The intensity index is a metric exclusive to Silbato Pro that scores from 0 to 100 the expected level of disciplinary friction of a match before it begins. It is not a prediction of the exact number of cards, but an estimate of the disciplinary environment: a match with an index of 70 is far more likely to be heated than one with 20. The score is computed by combining multiple factors with weights calibrated from historical data of the current and previous seasons.
The referee is the single most important factor in a match's discipline. The gap between the strictest and the most lenient referee in Primera División can exceed 3 cards per match on average. Silbato Pro takes into account the average cards of the appointed referee, their tolerance (fouls per card), their recent trend (last 5 matches) and their specific record with the two teams involved. A referee who typically shows 6 yellows when officiating Getafe but only 3 with Villarreal provides very different information depending on the match.
Some fixtures historically produce more cards than the average regardless of the referee. Regional derbies (Betis-Sevilla, Atlético-Real Madrid, Barcelona-Espanyol) tend to be more intense due to inherent rivalry. But there are also pairs of teams that, without being historical rivals, produce physically demanding matches because of their contrasting playing styles. Silbato Pro analyses head-to-head fixtures from recent seasons to detect these patterns and adjust the intensity index accordingly.
Position in the table has a direct impact on disciplinary intensity. Matches with relegation implications are, statistically, the most fraught of the season: teams fighting for survival play with an urgency that translates into more tactical fouls, more protests and more cards. Matches for European spots also raise the intensity, especially in the final rounds. Conversely, fixtures between mid-table teams with nothing at stake tend to be the calmest. Silbato Pro automatically computes the standings relevance of each match.
The number of booked players in a match influences intensity in two opposite ways. On one hand, a team with several booked players may play more cautiously to avoid suspensions, reducing aggressiveness. On the other, rival teams may try to provoke those booked players into picking up the yellow that keeps them out of the next round. In addition, the booked players themselves sometimes take calculated risks if they feel the ban suits them (for example, ahead of an international break). Silbato Pro shows how many booked players each team has before every match.
Away teams receive, on average, more cards than home sides in Primera División. The gap is significant: around 15-20% more yellows as visitors. This bias persists season after season and has multiple explanations: the home crowd's pressure on the referee, the away team's need to resort to tactical fouls to break the home team's rhythm, and the referees' (conscious or not) tendency to be slightly more permissive with the home side. Silbato Pro's intensity index accounts for the disciplinary profile of every team as home and away separately.
Silbato Pro classifies matches into four levels according to their index: Calm (0-19), Tense (20-39), Hot (40-59) and Explosive (60-100). A match labelled Explosive has historically produced more than twice the cards of a Calm one. This information is useful for any fan who wants to understand what to expect from a fixture before kick-off, and it is complemented with the specific predictions for yellows, reds and fouls shown in each match preview.
Check all this data updated in Silbato Pro
View matchday preview