Decoding Defensive Coverage Responsibilities in American Football Using Factorized Attention Based Transformer Models

Abstract

Defensive coverage schemes in the National Football League (NFL) represent complex tactical patterns requiring coordinated assignments among defenders who must react dynamically to the offense's passing concept. This paper presents a factorized attention-based transformer model applied to NFL multi-agent play tracking data to predict individual coverage assignments, receiver-defender matchups, and the targeted defender on every pass play. Unlike previous approaches that focus on post-hoc coverage classification at the team level, our model enables predictive modeling of individual player assignments and matchup dynamics throughout the play. The factorized attention mechanism separates temporal and agent dimensions, allowing independent modeling of player movement patterns and inter-player relationships. Trained on randomly truncated trajectories, the model generates frame-by-frame predictions that capture how defensive responsibilities evolve from pre-snap through pass arrival. Our models achieve approximately 89\%+ accuracy for all tasks, with true accuracy potentially higher given annotation ambiguity in the ground truth labels. These outputs also enable novel derivative metrics, including disguise rate and double coverage rate, which enable enhanced storytelling in TV broadcasts as well as provide actionable insights for team strategy development and player evaluation.

Figures (8)

• Figure 1: Model architecture of the three coverage responsibility models. (A) General architecture that's shared amongst the 3 models (B) Different output heads for each model.
• Figure 2: Receiver-defender matchup results over time. Receiver-defender matchup predictions at (A) pre-snap, (B) mid-play, and (C) pass arrival.
• Figure 3: Coverage assignment prediction over time. From left to right, the frames show snapshots of predictions (A) 3 seconds before the snap and at (B) pass arrival.
• Figure 4: Misclassified individual assignments due to potential mislabeled samples (HIGH_SAFETY1) and/or genuine ambiguity in man vs. zone assignments (CB1). (A) Coverage assignment predictions at pre-snap and (B) coverage assignments at full play both show misclassified predictions. This example shows the model's bias toward symmetry and respecting the overall coverage scheme.
• Figure 5: Misclassified individual assignments due to disagreement on overall coverage scheme, leading to a cascade of predictions that do not align with the human labels, but are internally consistent within the context of the predicted Cover 2 shell.