Chirwa, who started the week level with Simba forward Bocco in the scoring charts, bagged a hat-trick in Yanga's clash with Njombe Mji at National Stadium.
The Zambian striker has scored 10 goals in the Ligi Kuu Bara this season while Bocco has 8 goals to his name.
Chirwa is looking to secure the Golden Boot award but the Yanga superstar has Simba's Emmanuel Okwi and John Bocco to compete with.
Yanga defeated Njombe Mji 4-0 last Tuesday and Chirwa scored two goals in the first half before completing his hat-trick in the second half while Emmanuel Martin scored the fourth goal for Young Africans.
Who will win Golden Boot this season?