Bolland, a third-line center, was surprisingly blasé about what he had done.

“I could always imagine the season ending this way,” he said, a sentiment that was as credulity-straining as the goal he scored. He was asked the difference between winning the Stanley Cup this season and in 2010.

“What’s the difference?” he said. “Nothing.”

Bolland and Bickell’s goals ended this classic, almost unbearably tense series, in which three games went to overtime and every game was razor close. Kane was voted the winner of the Conn Smythe Trophy as the playoffs’ most valuable player, becoming the third straight American to receive the honor. He had 9 goals and 10 assists in the postseason.

It was the Blackhawks’ fifth championship, joining their triumphs in 1934, 1938, 1961 and 2010.

Chicago trailed, 1-0, and did not mount a real threat until Toews, motoring at full speed after an undisclosed injury that knocked him out of Game 5 on Saturday, scored at 4:24 of the second period.

In Game 6, players dropped left and right as they put everything on the line with the Cup at stake. Bruins center Patrice Bergeron played a full game despite a series of injuries that did not become known until after the game.

Blackhawks forward Andrew Shaw played despite taking a hard shot to the face; later he carried the Cup around the ice while bleeding through his stitches. Blackhawks defenseman Niklas Hjalmarsson left for a short time after blocking a shot. Bruins forward Jaromir Jagr was rattled by a check from Bolland and missed most of the second period. Chicago’s Marian Hossa and Boston’s Nathan Horton played on through nagging injuries, as they have throughout this series.

The Blackhawks became the first team of the N.H.L.'s salary-cap era to win the Stanley Cup twice. After their 2010 victory, General Manager Stan Bowman had to trade away or decline to re-sign nine players from the championship roster because their rising salaries would have pushed the team over the cap.