After two successive grand final appearances in the Challenge Cup, CYMS' 2020 campaign ended at the second round as Wyong scored a 24-8 victory on a day where fans and players almost experienced four seasons in one day.

Early in the second 20-minute quarter, with the scores still at 0-all, the match was temporarily stopped due to lightning and then a heavy downpour left fans scrambling for cover.

But when the players returned it was Wyong who took the initiative, scoring in their first set from the restart and the visitors stayed on top from there.

CYMS were their own worst enemy at times, with plenty of errors and penalties conceded, but they were barely given a chance by the committed Roos side.

Wyong wasn't even meant to be playing in the match after being beaten by Asquith in the first round but the Magpies had player issue numbers so the Roos got the call back.

Much like CYMS sides of recent years they weren't the most physically imposing outfit but through unrelenting defence and a fine performance from halfback and captain-coach Mitch Williams, they ran in four tries to two.

"They were a good outfit and it was a bit odd," CYMS captain-coach Jarryn Powyer said with a wry smile post-game.

"We weren't the smallest pack out there for awhile but they were fit and worked well in the ruck and they were pretty mobile.

"When we started to lose a little punch they were really good at turning us over on our back.

"It was a great trial for us to see where we're at."

There was a handful of changes to the CYMS side which defeated Moree in round one, with Corey Cox shifting to five-eighth to partner Claude Gordon and Alex Bonham moving to hooker while Wade Kavanagh filled in at centre for the absent Kyjuan Crawford.

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The Fishies created some early chances but errors and penalties dominated the second quarter, while Tom Kaati's try had the Roos up 6-0 at half-time.

Early in the third quarter Williams was heavily involved and his kick set-up a try for Dustin Shaw.

CYMS finally kept hold of the ball and began to play some footy, spinning it wide for young winger Caleb Cook to dive over and get his side back in the contest.

CYMS went into the final term trailing 12-4 and began well, getting into attacking territory only to see Wyong winger Cody Boyle snaffle an intercept and race 50m to score and set up an 18-4 lead.

That took the wind out of the hosts' sails somewhat and while Jyie Chapman reached out to score his side's second, twisting his ankle in the process, Williams put second-rower Dylan Clark over late on with a lovely short ball to ice the win.

"We were in that arm wrestle for a long time and when it was time to start playing some footy we were in that mindset of just hitting it up," Powyer said.

"When we did test the edge we got results quick but we left it too late."

Wyong captain-coach Williams was a proud man post-game, as a number of new faces and younger players at the club got a chance to impress in a competitive fixture.

"It's an early season trip to play such a strong team like Dubbo and it was a gruelling first half," Williams said.

"There was only one try and a stoppage for rain, it had it all a bit, but it was a really good hit-out and I'm happy with some of the signs I saw."

Williams has been a massive part of the Wyong club for a number of years and reached the heights of playing with the Sydney Roosters' Auckland Nines side in 2015 but this season marks his first as captain-coach of the club.

"I'm super happy with the defence," he said.

"Any coach coming in wants to work on the defence and obviously you'd love to stop all the tries but to only let in two against a good team like that, I couldn't be happier."