The win comes a night after Princeton led for about half the game against first-place Harvard before losing by three. While Princeton was rolling past the Big Green, Penn pulled the upset down in Cambridge, evening itself with the Crimson in the loss column.
Heading into the final full weekend of Ivy play, Harvard leads at 10-2 with Penn right behind at 9-2, Yale next at 9-3 and Princeton next at 7-4.
"We're playing some of the best basketball we've played this season. Even though we took a tough one last night, we still played well and we're continuing to play well," Denton Koon, who had 10 points as one of four Tigers in double figures, said as the Tigers have won four out of their last five.
New Hampshire native Patrick Saunders led Princeton with 14 points in his final game at Leede Arena, and fellow senior Douglas Davis set the program record for games played by appearing in his 117th contest. Current assistant coach Brian Earl '99 held the previous record at 116.
The home-state game capped a productive weekend for Saunders, who had a total of seven 3-pointers on the trip.
"When Pat makes shots, we can be terrific," Mitch Henderson, the Franklin C. Cappon-Edward G. Green '40 head coach of Princeton men's basketball, said. "Not just that, he was running the floor nicely. That's what you expect from seniors."
Ian Hummer had 11 points to move up to 17th on the Princeton all-time scoring list with 1,093. Brendan Connolly also finished with 11.
Dartmouth pulled to within 18-17 just after the midway point of the first half, but Princeton went on a 19-2 run to make it 37-18 less than six minutes later. Five Tigers had points in the run.
Princeton's largest lead was by 29 with more than seven minutes to go in the game. Sophomore Daniel Edwards had his first career 3-pointer in the win, and freshman Brian Fabrizius, who spent a prep-school year in New Hampshire, had his first collegiate bucket on a 3-pointer.
Princeton's 65.4 percent clip from the field was its highest since shooting 70.3 percent on March 4, 2005 at Harvard. The 25 Tiger assists - a total to which no single player contributed more than five (Brendan Connolly) as 10 players tallied at least one - were its most since last season's 25-assist performance against Cornell.
The Tigers' 85 points were the program's most against a Division I opponent in regulation since pouring in 89 against Lafayette on Dec. 7, 2002.
Princeton will host Brown and Yale next Friday and Saturday in Jadwin Gym.