CAMBRIDGE, Mass.Andy Gay hit Robbie Anthony with a 16-yard touchdown pass for the early lead and wide receiver-turned-defensive back Brian Kosnik returned an interception 41 yards and added nine tackles in Dartmouth’s 21-6 loss to Harvard Friday in junior varsity action.

Four Dartmouth interceptions, two fumbles and a strip enabled Harvard to overcome 17 Crimson penalties and deal the Big Green jayvees their first loss. Dartmouth had posted earlier wins over Middlebury’s varsity and the Williams jayvees.

After giving up the touchdown on the Big Green’s second possession, the Crimson reeled off 21 unanswered points.

Gay completed 10-of-22 passes for 112 yards but was intercepted three times as the Harvard rush put him under pressure through much of the three quarters he played.

Marc Sasso ran for 42 yards on 11 carries and added three receptions for 21 yards for the Big Green. Tight end Dean Bakes added four catches for 47 yards. Tyler Stout had 11 tackles for Dartmouth. Ben Ticknor, Corey Vann and Kosnik had nine apiece.

Harvard missed a 28-yard field goal on its first possession before Kosnik, a starting receiver in the first varsity game but seeing his initial duty in the secondary, ended the second with the interception he brought up the right sideline. But a Dartmouth three-and-out left it 6-0 (the Big Green’s PAT was missed) after one quarter.

Harvard took the lead late in the first half after Dartmouth fumbled away a snap near midfield. The Crimson’s march was helped along by a Big Green personal foul and a facemask penalty, and ended with a four-yard run and PAT to make it 7-6 at the intermission.

Dartmouth’s first drive of the second half ended when a big hit separated Gay and the ball at the Big Green 18. After the Crimson was stopped without a first down, Cole Marcoux was intercepted on his first attempt.

Harvard made it 14-6 on a 70-yard interception return of a Gay pass midway through the third quarter.

Dartmouth’s best chance to close the gap came when it drove to the Crimson seven late in the third period. But when an apparent interference call on Marcoux’s fourth-down pass to the end zone wasn’t called, the Big Green came up empty.

Harvard closed out the scoring with a two-yard touchdown run with 5:47 left. The Crimson outgained the Big Green, 378-258.

Dartmouth entertains Bridgton Academy next Sunday in the final jayvee game with kickoff at 1 p.m.