Dinnington gave their North One East rivals due notice when they handed Driffield a 17-7 beating in the first round of the Yorkshire Cup.
The home side went ahead with a try by winger Guell Truman and increased their lead to 12-0 before half time with another from his brother Alwyn Truman, on the other wing, from an interception just outside their own 22. Scrum-half Sam Crane landed the conversion.
Dinnington’s third came from second row forward Gary Woodcock, and they held off a late challenge from the East Yorkshire side who replied with a converted try 15 minutes from the end.
Barnsley, who open their Yorkshire Two league programme with a home match against promoted Castleford on Saturday, travelled to Knottingley and beat their league rivals 17-10 in the first round of the Yorkshire Shield.
Both sides scored two tries – centre Andy Buckingham and stand-off Will Smith touching down for Barnsley – but it was the goal kicking of Smith’s brother Josh which made the difference.
Josh, at full-back, converted both tries and slotted over a drop goal.
Wath-on-Dearne, relegated to Yorkshire Two, crashed to 45-19 in the Shield defeat to last term’s Yorkshire Two and defending Yorkshire Shield champions Bradford Salem at Moor Road.
Winger Ben Cairns scored Wath’s only first half try with full-back Adam West converting as they trailed 7-24 at half time. Salem scored another three tries to seal the win, but props James McCarthy and Ben Myers scored good tries which gave Wath some consolation.
Rotherham Phoenix secured a 26-15 win at Halifax Vandals in the Yorkshire Silver Trophy, with No 8 Tom Coy scoring two tries and thers coming from prop Carl Banks and wing forward John Styring.
Stocksbridge went down 34-16 in their Silver Trophy match at Baildon, while Hallamshire conceded against Hessle because of a player-shortage.