UPDATE 2-Buffalo Wild Wings Q4 beats Street; shares up

* Q4 EPS $0.73 vs est $0.67

* Q4 revenue up 34.5 pct at $220.5 mln

* Shares up more than 15 pct after the bell (Adds details on 2012 comp sales, store expansion, updates share move)

Feb 7 (Reuters) - U.S. bar and grill chain Buffalo Wild Wings Inc's quarterly profit beat analysts' estimates by the biggest margin in the last eight quarters, sending its shares up 15 percent in extended trade.

The company, known for its Buffalo, New York-style chicken wings, said it was off to a good start in the first quarter with same store sales rising 12.9 percent through the first six weeks of the year at company-owned restaurants.

Buffalo Wild Wings, which has been steadily increasing store count and expanding into international markets, has seen same store sales rise in the last few quarters.

Barring the second quarter of 2011, the company has topped earnings expectations for the eight quarters.

Net income for the fourth quarter rose to $13.6 million, or 73 cents a share, from $10.2 million, or 55 cents a share, a year ago.

The company, whose peers include Ruby Tuesday Inc and DineEquity Inc's Applebee's, said revenue jumped 34.5 percent to $220.5 million.

Same-store sales rose 8.9 percent in the fourth quarter.

Analysts on average had expected earnings of 67 cents a share, on revenue of $210.5 million, according to Thomson Reuters I/B/E/S.

The company's shares, which have soared more than 45 percent last 12 months, were up about 15 percent after the bell. The stock closed at $70.19 on Tuesday on the Nasdaq. (Reporting by Meenakshi Iyer in Bangalore; Editing by Maju Samuel, Saumyadeb Chakrabarty)