Аннотация:The chemical freeze-out irregularities found with the most advancedhadron resonance gas model and possible signals of two QCD phase transitionsare discussed. We have found that the center-of-mass collision energy range oftricritical endpoint of QCD phase diagram is [9; 9.2] GeV which is consistentboth with the QCD inspired exactly solvable model and experimental findings.Conference: Baldin ISHEPP XXIV