Certainly, such games are not designed for adjustability of {HEAD ~ the relative importance} played by chance and {TAIL ~ skill} 
played by
Certainly , such games are not designed for adjustability of { HEAD ~ the relative importance } played by chance and { TAIL ~ skill }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH TAIL TAIL TAIL TAIL TAIL