In recent years, fundamental relationships for the black hole X-ray binaries have been established between their X-ray luminosity L-X and the photon index Gamma of their X-ray spectrum. For the moderate -luminosity regime, an anticorrelation between F and L-X has been observed. In this paper, aimed to verify if the moderate luminous X-ray binary system LS I +61 degrees 303 is a black hole, we analyse Swift observations of LSI+61 degrees 303. We compare the derived L-X versus F distribution, first with the statistical trend for black hole X-ray binaries, then with the trend of the pulsar PSR B1259-63 and finally with the individual trends of the black hole X-ray binaries Swift J1357.2-0933 and V404 Cygni. We find that the system PSR B1259-63 shows a positive correlation between F and L-X, whereas in contrast LS I +61 degrees 303 shows the same anticorrelation as for black hole X-ray binaries. Moreover, the trend of LS I +61 degrees 303 in the L-X/L-Eddinoton-Gamma plane overlaps with that of the two black holes Swift J1357.2-0933 and V404 Cygni. All three systems, Swift J1357.2-0933, V404 Cygni and LS I +61 degrees 303 well trace the last part of the evolution of accreting black holes at moderate luminosity until their drop to quiescence.