Stingers bagged the biggest win of the weekend in the Nairobi nationwide league Universities category beating MMU Hawks 98-3 in Rongai.
Obonyo, Swale, Thaddeus Momanyi, Wycliffe Ratemo(2) and Amos scored in the first half as Stingers led 43-0 with two of them being penalty tries.
Bill completed his hattrick in the second half with Galaxon Mosii, Arthur(2), Swalleh, Dan and Obonyo also scoring.
Other matches saw KCA go down 12-29 to Farus Rugby, Daystar Falcons beat Nazarene 36-0, AP defeat Moh Spice by 54-3 while Pioneer lost 0-24 to TUK.
New-signing Kevin Atandi was on the scoresheet for Daystar Falcons who ran in six tries.
Nairobi Nationwide results
Mohspice V Administration Police 3-54
KCA V Cooperative 12-29
Nazarene V Daystar 0-36
Multimedia V Stingers 3-98
Pioneer V TUK 0-24