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LONDON -- Demonstrating their efficient transformation under Antonio Conte, Chelseas players reeled off an 11th successive victory in a Premier League season for the first time Saturday.Diego Costas header secured a 1-0 win at struggling Crystal Palace, sending the leaders nine points clear of Liverpool and Arsenal.It came on the first anniversary of Jose Mourinho being fired with the west London club a point above the relegation zone. Apparent harmony in the dressing room has replaced the palpable discord with the players which triggered Mourinhos exit.Although the wins are racking up, Chelsea might soon pay for its inability to kill off games with the Palace success completing a hat trick of 1-0 victories.The defense, though, is watertight under Conte, keeping nine clean sheets in the winning run that started after a 3-0 humbling at Arsenal and the switch to a three-man defense.The manager must be a tailor and try and find the right fit for the team, said Conte, the former Italy and Juventus coach. For sure, for me, it wasnt easy to arrive and understand very quickly the characteristics of my players. I needed a bit of time.I tried a different solution before changing the formation, but I think the most important thing is the mentality, our strong mentality. Also hard work during the week -- tactical work, physical work, analysis.With mist descending on the Selhurst Park field, the only goal in the lunchtime kickoff came from Chelseas first attempt on target in the 43rd minute.Costa rose above Scott Dann to meet Cesar Azpilicuetas cross and net his 13th goal of the season. The Spain forward has eclipsed last seasons haul for Chelsea before the halfway point has been reached.If wed arrived here today without the right concentration and focus, the will to fight and go into battle with your opponents, wed have lost this game for sure, Conte said. Instead, we have great quality but the players are putting that quality into the team.Chelsea, though, will have to cope without Costa at home to Bournemouth on Dec. 26. Chelseas top-scorer picked up a fifth booking of the season for a tackle on Joe Ledley before scoring.Midfielder NGolo Kante, who also accumulated five yellow cards with his second-half caution, also has two weeks off before the New Years Eve game against Stoke.Palace manager Alan Pardew might also have an enforced break -- unless results improve. Chelsea condemned Palace to an eighth loss in 10 games to leave the south London club three points above the relegation zone.Chelsea are very sound defensively and didnt really give us any chance to get at them as much as wed have liked, Pardew said. They were confident in their defending, (with) good shape and discipline to their actions, and did enough offensively to edge it.Chelsea equaled the 2009 teams 11-match winning run set across two seasons in 2009.Arsenals 14-match winning run in 2002 remains a Premier League record -- for now. 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LOUIS -- Heading into the final stretch of the season, the issues for the Chicago Bears banged-up defence only seem to be getting worse.A group of 70 doctors and health experts have written to the government urging them to ban tackling in school-level rugby. The RFU is currently driving to increase youth participation in rugby, but some experts are worried about the high-impact nature of the game, and the long-term effects it could have on the health of children.The majority of all injuries occur during contact or collision, such as the tackle and the scrum, the letter said. These injuries, which include fractures, ligamentous tears, dislocated shoulders, spinal injuries and head injuries, can have short-term, life-long, and life-ending consequences for children. Sky Sports News HQ reporter Geraint Hughes explains how teachers might change the way rugby is played at their schools.dddddddddddd A link has been found between repeat concussions and cognitive impairment and an association with depression, memory loss and diminished verbal abilities, as well as longer term problems.The Rugby Football Union said that high quality coaching, officiating, medical support and appropriate player behaviour would help to reduce the risk of injury.Should tackling be banned from school rugby? Share your thoughts below or Tweet us @SkySportsRugby Also See: Monahan swaps rugby for MMA Dewi: Two rising stars Owens: Rugby needs grassroots Follow @SkySportsRugby ' ' '