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(GOOG) - Get Alphabet Inc. Class C Report

bought a big seat in the local dining market.

The Net search giant says it has acquired restaurant review publisher


for an undisclosed amount of money.

The move will give Google a popular guidebook franchise along with a big online dining discussion forum as it pushes further into the local advertising market.

"Zagat will be a cornerstone of our local offering," Google local business chief Marissa Mayer wrote in a

blog post


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Zagat reviews feature a numerical rating as well as a composite opinion based on snippets of user surveys.

The move is a direct attack on upstarts, like review site


, local coupon specialist


and is a potential threat to restaurant reservation broker



. OpenTable shares fell 10% on news of the deal Thursday.

Google has been beefing up its local

daily-deal effort with Google Offers

and has been pushing its local search and location-based services on mobile devices as a way to capture more of the local advertising market.

Google shares were up 0.5% to $537 at midday Thursday.

--Written by Scott Moritz in New York.To contact this writer, click here: Scott Moritz, or email: Scott on Twitter at MoritzDispatch