DOHA: Duhail on Tuesday widened the points gap at the top of the Qatargas U-23  League with a 1-0 win over immediate chasers Al Arabi.     Nasser Al Yazidi scored in the 17th minute for Duhail in the Qatargas round 7 match-up.     Duhail now have 27 points after round 7 while Al Arabi have a tally of 20.     In another game, Al Ahli beat Al Sailiya 3-1 after goals by Abdullah Hassan (33), Nasser Al Kaabi (83) and Ahmad Faisal  (89).     For Al Sailiya, Saeed Al-Marri scored the goal in the 48th minute.     Al Ahli's Ibrahim Al-Karbi was shown the red card in the 72nd minute.     Al-Ahli have 15 points while Al-Sailiya could not add to their 10 points.     In another match, 10-man Al Kharaitiyat came from 1-3 down to achieve a 3-3 draw against Al Sadd in what was a dramatic tie.     For Al Kharaitiyat the goals were scored by Ibrahim Ali (21), Abdullah Hussain (49), Abdul Hadi Numan (87).     Al Sadd have 18 points while Al Kharaitiyat have a tally of 8.