A fairly even first half saw penalty kicks dictate the swing of the scoreboard but Samoa suddenly raced away with four quickfire tries to condemn Chile to their second successive Pool D loss.
Kicking proved to be crucial to snatch points as Matias Garafulic’s effort gave Chile the advantage but another Leali’ifano penalty edged Samoa 12-10 ahead.
Duncan Paia’aua scored Samoa’s first try of the game, pouncing on a grubber kick to cross, with Leali’ifano adding the extra for a nine-point lead at half-time.
Jonathan Taumateine claimed Samoa’s second just minutes after the break and a ruthless period saw Samoa extend their lead further when Fritz Lee crossed and Sama Malolo earned the bonus point with a converted try, scoring near the posts from a maul.
The game was reduced to 14 against 14 when Alfonso Escobar (Chile) and Ereatara Enari were sin-binned within a minute of each other but Chile’s miserable afternoon got worse when Esteban Inostroza was shown a yellow card within minutes of coming on as a substitute.
Malolo then earned his brace right at the death, which Lima Sopoaga converted, to cap a dominant afternoon for Samoa.