Radical rugby law trials will be used across Britain this weekend

The new tournament combines South Africa's former Super Rugby sides - Bulls, Stormers, Sharks and Lions - with the existing Pro14 teams.

There are all-South African, Irish and Welsh games in the first three rounds.

Scottish sides Edinburgh and Glasgow play Italian opposition first up, but then play each other home and away in the following two rounds.

CAPTAIN'S CHALLENGE - Team allowed one captain's challenge but only for try-scoring, foul play or last five minutes of each half. Retain challenge if successful

RED CARD - ability to replace red-carded player after 20 minutes

GOAL-LINE DROP-OUT for held-up, knock-in in goal or forcing/grounding a ball which is kicking into in-goal. Reward defensive team with a drop-out anywhere on goal-line

Ulster v Connacht

Leinster v Munster

Benetton v Glasgow Warriors

Edinburgh v Zebre Rugby Club

Ospreys v Cardiff Blues

Dragons v Scarlets

Vodacom Bulls v Emirates Lions

DHL Stormers v Cell C Sharks

DHL Stormers v Vodacom Bulls

Cell C Sharks v Emirates Lions

Connacht v Leinster

Munster v Ulster

Zebre v Benetton

Glasgow Warriors v Edinburgh

Cardiff Blues v Dragons

Scarlets v Ospreys

Vodacom Bulls v Cell C Sharks

Emirates Lions v DHL Stormers

Munster v Connacht

Leinster v Ulster

Benetton v Zebre

Edinburgh v Glasgow Warriors

Scarlets v Cardiff Blues

Dragons v Ospreys