By Sam Laskaris Writer The Six Nations Chiefs had to rally from a three-goal deficit late in the third period on Monday. Then they had to play a bit of overtime before emerging with a 10-9 victory over the visiting Cobourg Kodiaks in their Major Series Lacrosse (MSL) season opener. Newly-acquired Larson Sundown was the OT hero for the Chiefs, in the match staged at the Iroquois Lacrosse Arena in Hagersville. Sundown scored the game-winning goal at the 4:17 mark of the extra session. The Six Nations squad had acquired Sundown’s rights a couple of days earlier from the Western Lacrosse Association’s Victoria Shamrocks in exchange for future considerations. Chiefs’ general manager Duane Jacobs was familiar with Sundown since he also toiled in the National Lacrosse League this season with…