After man of the match Cory Allen benefited from an interception to cross the whitewash Aaron Warren plundered two tries to bookend Scarlet Rhodri Williams' fine effort , a Jordan Williams score and a penalty try.

Adam Ashe's late try gave the Scottish fans something to cheer in the second half but a Welsh win now sets up a tantalising clash with defending champions England on the final weekend.

Wales set out with all the confidence of a side yet to taste defeat in this competition and quick ball from scrum-half Rhodri Williams almost sent lock Carwyn Jones over in the fifth minute.

Further Welsh pressure eventually saw the Scots concede a penalty that Sam Davies converted to give the visitors a 3-0 lead.

Wales continued to threaten and Warren needed to be hauled down close to the line after a fine break, while full-back Jordan Williams was also denied at the last following a great dummy.

Yet after defending manfully it was Scotland who registered the next points, drawing level after Tommy Allan punished a Welsh indiscretion by slotting three points.

Moments later Scotland were ahead when Muir emerged from the bottom of the pile following a powerful driving maul and Allan added the extras.

Wales responded immediately when flanker Danny Thomas intercepted a wild pass and held off the tackle long enough to supply Allen for the try and though Davies missed the conversion the visitors now trailed by just two points.

That deficit was wiped out when Warren appeared on the overlap to cross in the corner and Davies curled over the conversion.

The impressive Rhodri Williams then produced an electric break to cross right on the stroke of half-time with Davies again sweeping over the conversion to put Wales 10-22 up at the break.

A penalty from Davies ensured Wales began the second half on the front foot and they went further ahead when a long pass from Harry Robinson was collected gleefully by Jordan Williams who went over in the corner.

Wales lost Thomas to the sin bin but Scotland failed to take advantage and when the visitors were restored to a full complement their power proved too much for the hosts, who conceded a penalty try.

Scotland responded in the right manner, pushing hard for a try and Jones became the second Welsh player to see yellow as the visitors defended desperately on their own line.

But with Scotland striving to cross the whitewash, Wales broke from their own try-line and Warren crossed at the other end to score.

Scotland got the try their persistence deserved with two minutes on the clock when Ashe crashed over and Allan converted but by then the game was up.