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NFC West game changers: Weeks 15-16

San Francisco held off Seattle this past Saturday thanks in large part to Larry Grant's forced fumble with 1:18 left to play. Otto Greule Jr./Getty Images

The Seattle Seahawks and San Francisco 49ers played without a turnover until 1:18 remained in their game Saturday.

That is when the 49ers' Larry Grant forced the Seahawks' Tarvaris Jackson to fumble. Donte Whitner recovered for San Francisco. The 49ers hung on to win, 19-17.

That sequence produced the NFL's largest one-play swing in win probability for Week 16, according to Alok Pattani of ESPN's analytics team. It also pointed to a season-long trend for the 49ers. They have now gone 18 consecutive quarters without a turnover. They are one game from tying an NFL record since 1940 for most games in a season with one or fewer turnovers, according to Pro Football Reference.

The play by Grant and Whitner stands atop the latest chart of most pivotal plays involving NFC West teams, provided by Pattani. This chart combines plays for Weeks 15-16. Travel for "Monday Night Football" and a midweek trip to visit family during the holidays precluded publication of the list last week.

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2011 NFC West Game Changers: Weeks 15-16