By Sam Laskaris Writer They started the way they intended to finish. The Six Nations Chiefs took a commanding lead in their Mann Cup championship series. It began with the Chiefs eked out an 8-7 victory over the host New Westminster Salmonbellies on Monday night. With that triumph Six Nations is now enjoying a 3-0 lead in their best-of-seven series, which will determine national Senior A lacrosse bragging rights for the year. The Chiefs were hoping to sweep the series as Game 4 Tuesday. The Salmonbellies are hosting all of the matches in the national series at the Queen’s Park Arena. For the Chiefs its would be their seventh Mann Cup title this year. The franchise last captured the prestigious national trophy in 2016. “We’re in a good spot,” said…