DOHA: Al Khor pounded half a dozen goals in a 6-1 win over Al Ahli in their Qatargas U-23 league match.     Saad Mohammed scored four goals in the round 10 clash in the 15th, 69th, 70th and 77th minutes. Salem and Ahmed were the other scorers.     For Al Ahli, the only goal was only scored by Mohammed Yasin in the 88th minute.     Eighth-placed Al Khor have 14 points while Al Ahli - in seventh spot - have a tally of 15.     In another match, Al Duhail eased past Al Markhiya 4-2. Nasser scored three goals for Al Duhail (12, 29 and 33). Yasin Abdullah scored the fourth goal in the 51st minute.     Saud (47) and Mohammed (62) scored the goals for Al Markhiya.     Ninth-placed Al Markhiya have 13 points. Points leaders Al Duhail have an impressive tally of 33.     In another game, Al Arabi beat Al Sailiya 2-1. Abraham Nasser scored the goals (76 and 88). Al Arabi have a tally of 23 points to claim 10th spot.     In other fixtures, Al Gharafa beat Umm Salal 3-1, Al Sadd edged Qatar SC 1-0 while Al Rayyan beat Al Kharaitiyat 4-0.