Hannah Dwyer scored twice in the first half, and Parker Hartnett got two goals in the second half as the Clippers (5-1-1) beat the Knights (1-7) in Poland.
Adriana Whitlock rounded out the scoring. Yarmouth keepers Hope Olson and Kate Siegel combined for seven saves.
Sophia Vallee stopped 20 shots for Poland.
YARMOUTH 5, POLAND 0
Yarmouth, 2, 2, 1.Goalies (saves)—
Yarmouth, , 7; Poland, 20.