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Valley picked up five points with a 39-17 win over third-placed Excelsior.
Meanwhile, Old Boys picked up five points after injuries and the inability to field a front row forced Maheno to default.
Valley was too strong as it outscored its opposition by six tries to two at Weston Park.
Excelsior held its own in the first half and trailed 14-17 at halftime, but Valley dominated the final 40 minutes.
Valley's Darryl Edwards and Excelsior's Antonio Misiloi each scored to leave things close heading towards halftime.
No 8 Jake Greenslade crossed for a try to give Valley a 17-7 lead just before the break, before a Tom Moysey try made it 17-14 at halftime.
A Moysey penalty allowed Excelsior to draw level 13 minutes into the second half.
But Excelsior could not kick on.
The powerful Valley pack created tries to flanker Junior Fakatoufifita, halfback Glen Sturgess and lock James Graham, before fullback Brad Fleming touched down just before fulltime.
In a high scoring game, Kurow came from behind at halftime to beat Athletic Marist 46-33 at Whitestone Stadium.
Athletic right winger Tanilla Halili scored an unconverted try, but two minutes later, Kurow drove over and Sam McDonald converted.
Athletic was down to 14 men 13 minutes into the game when one of its players was red carded.
A Pat Henwood try extended his side's lead to 12-5 before Athletic winger Taniell Halili scored for halfback Anthony Arty to convert.
McDonald added a penalty to give Kurow a 15-12 lead and a Tyler Burgess try converted by McDonald put Kurow out to a 22-12 lead.
Athletic finished the better of the two in the final 10 minutes, with Athletic running in three tries to Arty, Mason Kinzett and speedy winger Etene Gucate to hold a 33-22 halftime lead.
Kurow took over after halftime.
Mike Patterson scored for McDonald to convert, before prop Lototonga Malafu put Kurow in front 34-33 with an unconverted try.
Five minutes later, Paterson crossed for his second try, which McDonald converted, and in the final minute, Burgess put McDonald in for a try.
Waitaki Girls Wildfire beat Waitaki Girls Lightning Strike 41-34 on Tuesday.
Wildfire fired in midcourt, where Molly Hurst and Madaleine Mansfield played their best games of the season and never allowed Lightning Strike into the game.
Kurow A applied early pressure against Valley Gold and led 10-6 after the first quarter.
Valley Gold upped its pressure in the second quarter, but at halftime Kurow A held a 19-17 lead.
Valley Gold managed a couple of crucial turnovers to lead 29-26 at threequarter time and held on for a 38-35 victory.
Goal shoot Brytnee Firman was solid for Valley Gold, while Rebecca McIntyre was on target shooting the majority of Kurow's goals.
McIntyre was well fed by Bella Martin and Rebecca Stark, while the defence worked tirelessly.
Valley Silver led Maheno 8-3 after the first quarter, but Maheno lifted its intensity to win the next three quarters and come out with a 34-20 victory.
Athletic Maroon started well against St Kevin's A, but after a 10-10 scoreline at the first break, St Kevin's raced away to a 23-13 halftime lead.
St Kevin's extended its lead to 30-14 at three-quarter time and pulled away to win 39-19.
- Terry O'Neill