The remaining 77 minutes of regulation were scoreless between the fourth seed Wildcats and fifth seed Warriors, along with the first 15 minutes of golden goal overtime.
In the fifth minute of the second overtime (100th overall), Alex Shaughnessy was able to find the net for the Wildcats, advancing past the Warriors to the sectional semifinals.
Paul Fine-Lease assisted on the Pierson goal, while Lucas Cross made 10 saves in net for the Warriors.
Beavers knocked off
Schroon Lake will travel to face top-seeded and defending NYSPHSAA Class D state champion Chazy, who scored a 4-1 win against Keene.
Keene fired the opening shot in the game as Gabe Warner scored on an unassisted goal in the seventh minute of play. The Eagles then scored four unanswered goals in the 13th, 23rd, 45th and 73rd minutes.
Brandon Dumas made 17 saves in net for the Beavers.
The Lions will host Wells at 3 p.m. in Lewis, while Chazy will host Schroon Lake at 6 p.m.