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Prop James Meehan scored twice in a tight game which Wharfedale eventually won by the narrowest of margins.
Conditions were the worst they have been all season, but both sides handled them amazingly well.
Playing downhill, Wharfedale made progress through the pack, particularly via the back row, with Ben Markey and Rob Baldwin both threatening.
The Wharfedale half-backs and centres Riddiough, Verirty, Coulton Cicognini were threatening too but the opening try was scored by Meehan after 21 minutes following concerted work by the home pack, Rob Davidson converting.
Shortly after, Tynedale's scrum engineered a try for Oscar Caudle which was converted by Josh Leslie. Three minutes later Davidson kicked a penalty for Wharfedale to make it 10-7.
Then a brilliant kick and chase by Ryan Hodgson from inside his own half might well have led to a try but Tynedale somehow survived.
In the second half there were more mistakes with Wharfedale unable to capitalise on abundant possession until great combined play resulted in Meehan scoring again wide out on the left. The difficult conversion drifted past the right post.
A period of far too many examples of ill-discipline, particularly by the home side, saw a deserved try by Chris Wearmouth, converted by Leslie.
Leslie followed up with a penalty three minutes later after 73 minute to make it 15-17.
This made for a nail-biting finish, with first Davidson successfully kicking a penalty after 77 minutes and Leslie being short with the last kick of the match.
This was the usual entertaining match between two sides who always try to play enterprising rugby and who have a great respect for each other.
The sizeable crowd certainly appreciated the effort made to entertain in appalling conditions.
Visiting coaches Ben Woods and Matt Shields remarked on the competitiveness of the match, something they had come to expect from these two sides. And, like the game at Corbridge earlier in the season, also won narrowly by Wharfedale, it could have gone either way.
Home spectators had their hearts in their mouths, he said, and both sides put up incredibly brave performance son what was a thoroughly wretched afternoon.
On the day, Wharfedale made fewer mistakes and finished in the ascendency even though playing uphill and continuing to give away unnecessary penalties. The good news, however, was that no yellow cards were awarded to either side, something that is increasingly rare at all levels.