A strong second quarter saw Koonibba defeat Thevenard by 81 points in Far West A grade football at the Far West Aboriginal Sporting Complex on Saturday.
Attempting to recover from a loss to Western United, the Roosters pulled clear with five goals in the second term as they went on to win 17-20 (122) to 6-5 (41).
The Roosters enjoyed the better of the first quarter to lead by 10 points, yet the margin may have been wider if not for six behinds.
The home side made their move after quarter-time with five goals from 12 scoring shots, compared to a behind for Thevenard, which saw the lead balloon out to 46 points at the main break.
Koonibba did not let up after half-time, scoring four goals in both the third and fourth terms as the Magpies could manage only three during the second half.
It was the result the Roosters needed to keep pace with Western United.
They were led by the golden boot of Tyron Winfield as he kicked six goals, while Edwin Gray added three.
Dom Denton kicked two goals for Thevenard.
Western United also ran away in the second quarter to crush the Blues 27-11 (173) to 4-6 (30) at Penong.
The unbeaten league leaders controlled the match from the outset to win by 143 points.
Westies started well, although the Blues kept in the match with two goals to trail by 17 points at quarter-time.
The Blues secured a first win of the season a week earlier, but were blown away in the second term as Western United kicked 10 goals to one to lead by 73 points at half-time.
The carnage continued in the third quarter as the Tigers kicked four goals to a single behind.
Western United ran out the match with another punishing quarter, kicking eight goals to one in the final term to move up to 14 points after seven matches.
Tyler Dunn led the goalkicking with eight majors and was well supported by Jesse Chandler's five, while Bayln Thompson kicked two goals for the Blues.
In the B grade, a big second half helped Koonibba down Thevenard by 68 points.
The Roosters kicked 10 goals after half-time to win 14-12 (96) to 4-4 (28).
Just five points separated the teams at quarter-time and while Koonibba further extended the lead at half-time there was only 13 points in it.
Koonibba had kicked nine behinds from 13 scoring shots to that point, but found the middle with greater regularity in the final two quarters with five goals in each as Thevenard could only add one.
Shaquille Kruger dominated with five goals and Tory Ware booted four, while Thevenard's Neville Bryant kicked two.
Western United cruised to an 80-point success against the Blues.
The Tigers were in command throughout the four quarters to win 14-11 (95) to 2-3 (15).
Peter Dobbins led the way with four goals.
The hosts led by 22 points at quarter-time and the lead continued to grow, especially with the Blues only kicking one goal in the opening three terms.