BBC Sport - Welsh derby classics: Newport beat Cardiff in 1977 Welsh Challenge Cup final
Newport beat Cardiff in 1977 Welsh Cup
- From the section Welsh Rugby
They call it Judgement Day, and on Saturday more than 60,000 fans will watch Wales' four rugby regions in action at the Principality Stadium in Cardiff.
The showpiece of the domestic game in Wales - in its fourth season - will see Cardiff Blues tackle Ospreys followed by Newport Gwent Dragons against Scarlets.
Get in the mood with some classic Welsh derby moments.
Here, Newport shock Cardiff 16-15 in the 1977 Welsh Challenge Cup final at the National Stadium.