The play-off positions in the Betway#Premier League of #Darts are beginning to become clearer after night 13 in Birmingham. With just two weeks of fixtures left to play, two players have already been confirmed in the crucial top-four places. St Helens' Dave Chisnall joined the top seed Michael van Gerwen as a guaranteed qualifier last night. PDC World Champion Gary Anderson slipped back into fourth position after an inspired Raymond van Barneveld claimed a double success. It was an unlucky night for Adrian Lewis though, as his qualifying hopes nose-dived with two defeats.

Chisnall and Lewis were first on stage at the Barclaycard Arena.

With Lewis doubling up at the Midlands' venue, he had a big opportunity to stake his claim on the play-off positions. Sadly for him, things did not quite go to plan. Despite a promising opening against Chisnall, as he took an early 3-1 lead, Lewis ultimately slumped to a 7-4 reversal. The Stoke player slightly outscored Chisnall on the night, but his lower checkout conversion percentage (29% against 47%) proved to be the difference. Chisnall's victory confirmed his place in the play-offs, although both van Barneveld and Anderson can still overtake him for second place.

Van Barneveld also doubled up on the night but enjoyed a far more positive result from his first game against Anderson. Neither player was at their best, missing several doubles during a tense tussle. The Dutchman seemed off the pace as he fell 4-0 behind to the Scot but then found some of the forms he has enjoyed in recent weeks to storm back.

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Five legs in a row gave him a narrow lead, but they were level again in leg ten as Anderson found a 13-dart finish. 'Barney' edged out to 6-5 in the next leg and closed out the game 7-5 as Anderson missed doubles in the decider. The game included an unsavoury incident, as Anderson claimed that his opponent had stamped when passing him in mid-throw. The Dutchman did not concur, but it still rankled with the Scot at the end of the match.

The highly-anticipated clash between league leader van Gerwen and Phil Taylor delivered the best scoring averages of the evening. 'Mighty Mike' took the match 7-4 to re-affirm his favourite's tag for the overall crown. With a 112.91 average in his favour, Taylor did admirably well to stay in touch. His own three-dart score consistency of 107.58 would have won any of the other matches in Birmingham. The defeat sees the 16-time World Champion back in 5th place, three points off the top four. It now looks to be a tall order for him to stay in the competition.

Lewis' second match against van Barneveld proved a thoroughly disappointing affair for him and his chances in the league. Averaging under 90, he could do little as the Dutch maestro claimed a 7-2 victory. Even two 132 checkouts proved to be no consolation for Lewis. Van Barneveld broke his throw three times and took out a wonderful 161 finish of his own.

James Wade and Stephen Bunting shared a point apiece in a low-key 6-6 draw. The result was of little use to either player, as their qualifying hopes are now over.

The action moves on to Newcastle next week, with Taylor desperately needing a success against Anderson, a repeat of this year's world final.