The Six Nations Chiefs now hold a 2-0 lead in their best-of-seven Major Series Lacrosse championship series after battling to a road victory in Peterborough on Thursday.(Photo by Darryl Smart) By Sam Laskaris Writer Thanks to another strong opening period, the Six Nations Chiefs have taken control of their Major Series Lacrosse (MSL) championship final series against the Peterborough Lakers. The Chiefs jumped out to a 5-2 lead after the opening 20 minutes of action on Thursday in Game 2 of the best-of-seven series. Six Nations went on to register an 11-6 triumph in the match held at the Peterborough Memorial Centre. The Chiefs also had a 5-1 advantage after the first period in the series opener in Six Nations two nights earlier. Six Nations went on to win that…