Introduction:

in this article, a model is developed that includes the main elements of a typical game situation in which the assistant referee must judge a possible offside. In this conceptual framework, the assumption is incorporated that the assistant makes a change of gaze and can only evaluate the relative position of the attacker with respect to the penultimate opponent thousandths of seconds after the pass..

Objective:

to identify the determinants of the degree of difficulty that exists for the assistant referee to correctly judge a possible offside.

Material and methods:

analytical-synthetic and systemic structural-functional methods were used as theoretical methods of scientific research. From the empirical ones, documentary analysis and expert judgment, as well as estimates based on geometric calculations.

Results:

it is shown that in most cases the assistant referee must make a decision at the precise moment in which the distortion derived from the change of gaze reaches its maximum expression.

Conclusions:

the estimates made for different situations allow the model's derivations to be verified and quantified.

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