VALLEY renewed their championship challenge after a 29-7 victory over previous leaders Kowloon at Boundary Street last night. With their only defeat of the season so far coming at the hands of Kowloon, Valley were eager for revenge and put the game out of their opponents' reach even before half-time. Fielding most of the internationals who played in Hong Kong's two emphatic victories over Taiwan last week, Valley caught Kowloon cold in wet and windy conditions. Tries by international wingers Jeremy Smith and Ashley Billington, both converted by Isi Tu'ivai, gave Valley a 14-0 lead only 10 minutes into the match. And before Kowloon could prepare their fight-back, Tu'ivai increased Valley's lead with a penalty and hooker Dave Reid, playing instead of the injured Andy Fields, scored an unconverted try, giving Valley a 22-0 lead. Scrum-half Emanuelle Bonhomme scored Valley's fourth try 10 minutes into the second with Tu'ivai converting for a 29-0 lead. Tim Leach's 60th-minute try failed to spark a comeback for Kowloon, who suffered their second defeat of the season. Despite the victory, Valley coach Ian Brownlee was fuming at referee Noel Howcroft. Brownlee confronted Howcroft after the match and exchanged heated words. ''The referee was terrible,'' said Brownlee after the match. Valley join Kowloon on 29 points, a four-point lead over defending champions Hong Kong Football Club. Valley, however, have a game in hand on Kowloon. But the title-race is far from over with any one of the three top teams still in with a chance. Valley must still face both Kowloon and Club in the third and final round of the three-round league format. Club, having lost three matches, cannot afford to drop any more points while Police, British Forces and Club Dragons are out of the running. Dragons have yet to win a match in nine attempts.