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