ENMatch-fixing is an interdisciplinary issue covering international, criminal and disciplinary law and even lawfulness (tactical elements of sports). One of the key difficulties is the broadness of the concept of match-fixing. The wide definition actually fits all branches of the afore said laws. Therefore, one must draw some guiding (yet, simplified and relative) criteria according to which the separation, as well as the interaction of legal systems could be possible. One of the criteria is dangerousness (seriousness) of the offence. Other criteria come from ECHR case law and from the disciplinary regulation: the nature of offence, the degree of fault of the offender and the nature of sanctions entrenched in a certain legal system. Considering such criteria, the standards of proving can be distinguished and it can be decided under what conditions certain legal system(s) should be applied to tackle match fixing. Keywords: match-fixing, criminalisation, standard of proving, interaction of legal systems. [From the publication]