The Blues put one over on the Ospreys in last night's penultimate pool game in the WRU Regional under 18 Championship at Jenner Park in Barry.
However, their 25-22 success in front of a record attendance for the competition - 1300 - does not affect the overall standings in the table.
In fact with the two sides having performed so well in the opening three months of the season, they will meet once again at the end of next month in the final at Llandovery.
With that game in mind, the Blues were understandably keen to strike a physcological blow. And they achieved that courtesy of tries from captain Jake Thomas, Christian Dacey and Lloyd Williams and three conversions and a long range penalty from Joe Deacon.
They led 15-12 at the interval with high performance manager Gafyn Cooper delighted with another excellent performance.
He said, "It was another great night for the boys. The staging of the game could not have been better and the crowd was far and away the biggest we have played in front us.
"They are a good side and made life really difficult for us, but we held on and Joe Deacon's penalty from half way earned us an excellent win."
In the other game, the Dragons recorded a 34-10 win over the Scarlets at Abertillery Park.
Cardiff Blues held its annual Sphere Solutions Blues Under-8 Tag Festival at BT Sport Cardiff Arms Park at the weekend - and not even the wet weather could wash away the enthusiasm of the young rugby stars who took part!
Can't get tickets for the Rugby World Cup? Well now you won't have to miss a second of the action alongside passionate fans as we are running two special events so you can watch the big games with Cardiff Blues and in the company of some Welsh rugby legends!
One of the most eagerly awaited events of the British motorsport calendar - the British FIM Speedway Grand Prix - will return to the Millennium Stadium on Saturday, July 4 - and at Cardiff Blues we've got FIVE PAIRS of tickets up for grabs!
The players at Cardiff Blues will be hoping to play with some true Gallic flair for the rest of the Guinness PRO12 season - after the region teamed up with a successful French bistrot in the Welsh capital.